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1. 9 1 Wiring Diagrams 9 1 10 Modem Components and Accessories 10 1 User s Manual P N 003452 Rev E Acoustic Telemetry Modems Figure 1 1 Figure 1 2 Figure 1 3 Figure 1 4 Figure 1 5 Figure 1 6 Figure 1 7 Figure 1 8 Figure 1 9 Figure 1 10 Figure 4 1 Figure 4 2 Figure 4 3 Figure 4 4 Figure 4 5 Figure 4 6 Figure 4 7 Figure 4 8 Figure 5 1 Figure 5 2 Figure 5 3 Figure 5 4 Figure 5 5 List of Figures The ATM 891 Deck Box ATM 885 and ATM 885R Acoustic Telemetry Modems ATM 887 and ATM 887R Acoustic Telemetry Modems The SR 100 SMART Release ATM 885PCB and ATM 885RPCB Modem Board Sets AT 408 Omnidirectional Transducer and Beam Pattern AT 421 Directional Transducer and Beam Pattern Data Acquisition and RF Link to Remote Station Periodic Acquisition of Stored Data Command and Control of an AUV Setup with ATM 891 Deck Box as the Local Modem Setup with ATM 885 as Local and Remote Modems ATM 891 Deck Box Front Panel Subsea Modem On Off Switches ATM 891 SERIAL I O Connector Subsea Modem POWER SERIAL Connector ATM 885PCB and ATM 885RPCB DSP Board Serial Connector J4 ATM 885PCB Transducer Cable Wiring Diagram The Remote Modem Window The Main Window The Opened Datalogger Menu The Battery Capacity Calculation Dialog Box Set up for Calculating Battery Pack Usage when Transm
2. vi Customer Service us Xxx ARR RA RA UNS Ree eR vi Contents oa aw a eati a Rea EAE E n vii List of Figures an SAG br A rn XV Listof Tables NNNM Rex xvii 1 Overview 1 1 Modem and Transducer Configurations 1 2 Surface Modems 42s Raw ee rc C e a da a ee DR 1 2 ATM 891 Deck Box 1 3 Model ATM 880 Module 1 3 Subsea lt 1 4 ATM 885 and ATM 885R Acoustic Telemetry Modems 1 4 ATM 887 and ATM 887R Acoustic Telemetry Modems 1 4 ATM 888 Acoustic Telemetry Modem 1 5 SMART Releases 1 6 SR 100 SMART Release 1 6 Modem Board Sets eee eae aa 1 7 ATM 885PCB Modem Board 1 7 ATM 885RPCB Modem Board Set 1 8 Remote Transducers 1 8 AT 408 Omnidirectional Transducer 1 9 AT 421 Directional 1 9 Acoustic k 1 10 Typical Applications 1 11 Remote Data Acquisition 1 11 AUV Command and Control
3. 6 3 Data F rmat RAE AT a oe nates ROI A 6 5 Online Break ias a pte sp ham abn oa 6 5 Error CHECKING aa b SERE MES S 6 5 Command Mode 6 5 Lowpower State ii i 2 2 edie eee eee 6 7 Acoustic Command Execution 6 8 Datalogger 22 a eee 6 8 Entering Commands 6 10 Online Interrupt PFF ius dex 6 15 AT su wA ORAS 6 17 Dial awit erie we ace De eee HE Ee d s sv Sine ak 6 19 Factory Reset amp osse nn 6 21 Hang rn p ws o i ER S 6 23 MO o AA o eit 6 25 Acoustic Link Test ATAM eee eases tet 6 27 Multiple Baud Rate Test eh 6 29 Remote Power AT Pn m 6 31 Remote Baud Rate AT An m 6 33 User s Manual P N 003452 Rev E Acoustic Telemetry Modems xiii Read Register 5 aaa V kata 6 35 Read Remote Registers 5 6 37 Set Register ATSnzn 6 39 o ovr CIR AXE CORREO v amp 6 41 Lowpower State ATIS niea tae eeu 6 43 Range ssi eA eratac de ATRN
4. 3 7 Typical Deployment Configurations 3 8 Dunking Transducer Deployment 3 8 Subsea Modem Deployment 3 9 Mounting Instruments to the ATM 888 Subsea Modem gt pr EE Rcg me RE aa 3 9 BENTHOS A Setup and Test 44 Unpacking and Inspection 4 1 Typical Setup Configurations 4 2 Modem Connections 4 3 ATM 891 Deck Box Front Panel Connectors 4 4 Subsea Modem Connectors 4 5 Modem Operator Functions 4 5 ATM 891 Deck Box Operator Functions 4 5 Subsea Modem Operator Functions 4 6 Setting Up the Modems 4 7 Setting up the ATM 891 Deck Box 4 7 Setting up the Subsea Modems 4 9 Setting up the Modem Board Sets 4 11 Setting up the ATM 880 Module 4 15 Setting up the Host Processor 4 15 Checking the Modems and Host Processors 4 16 Verifying Operation of the ATM 891 Deck Box 4 16 Verifying a Modem s Operating Parameters 4 16 Setting a Modem s Operating Parameters 4 18
5. 2 11 Input OutDpUL au aan eu ages een aa Aaa erac ac 2 11 Transd cers osa user ge veau ta nn M 2 11 AT 408 Omnidirectional Transducer 2 11 AT 421 Directional Transducer 2 12 Modem Battery Packs 2 13 Modem Battery Pack for ATM 885 885R Acoustic Telemetry Modems 2 13 Modem Battery Pack for ATM 887 887R Acoustic Telemetry Modems 2 13 3 Deployment Considerations 3 1 Remote Transducer Selection 3 1 Modem Battery Pack 3 2 Battery Pack Currents 3 2 Processing Overhead 3 2 Modem Battery Pack Capacity Calculations 3 3 Verifying the Modem Battery Pack Capacity for a Short Deployment 3 3 An Example Deployment Calculation 3 4 Modem Operating Depth 3 6 Modem Communications Range 3 6 Multipath and Noise 3 6 Transducer Orientation 3 7 Use of an Acoustic Baffle 3 7 Height Above the Bottom and Distance Below the Surface 3 7 Other Acoustic Equipment
6. 1 13 Modem Performance Factors 1 14 viii BENTHOS Barriers to Underwater Communications 1 14 Sound Speed in Seawater 1 14 co xe eds Pn eae Gone meee saad dee aes 1 15 Multipath Interference and Reflections 1 15 High Performance Modulation Techniques 1 16 Methods for Increasing Reliability 1 16 Convolutional Coding 1 17 Multipath Guard Period 1 17 Data Redundancy 1 17 2 Specifications 2 1 Generalis a ia RANE ak on nee ee 2 1 ATM 891 Deck 2 2 Physical Characteristics 2 2 Power Requirements 2 2 Input OUIDUE 3 2 ca O wee ah RON et a op a ah a 2 2 Iranscd 6ers atak aa ure rund este e uere e ON PUE 2 3 ATM 885 Subsea Modem 2 3 Physical Characteristics 2 3 Power Requirements 2 3 k U be FIN a 2 4 Transducers ieu dude ue reus eta RC hernia AI 2 4 ATM 885R Subsea Modem 2 4 Physical Characteristics 2
7. The contents of the remote modem s data logger block are transmitted at the baud rate set by S Register 4 of the remote modem 6 Modem Operating Modes and Commands Entering Commands 6 60 BENTHOS While the contents of the remote modem s data logger block are being transmitted communications with or between other remote modems is not possible While the contents of the remote modem s data logger block are being transmitted the remote modem will not accept any input over the serial interface or over the acoustic link User s Manual P N 003452 Rev E Acoustic Telemetry Modems 6 61 Clear Remote Data Logger ATSBCn Syntax AT BCn Enter Definition The Clear Remote Data Logger command causes the remote modem at address n to clear the contents of its data logger memory gt NOTE For the local modem to execute entered commands the modem must be in Command mode with the command prompt gt displayed Ifthe modem is not in Command mode refer to page 6 11 for instructions on how to place the modem into Command mode How to Use To use the Clear Remote Data Logger command type AT BC followed by the address of the remote modem and then press Enter The remote modem will clear the contents of its data logger memory and then the local modem will respond with the message OK Special Considerations When using the Clear Remote Data Logger command take note of the following To display the messag
8. gt User s Manual Reserved NOTE For an ATM 890 Series Acoustic Telemetry Modem S Register 9 is factory set to 1 for an ATM 880 Series 0 P N 003452 Rev E Acoustic Telemetry Modems 7 3 Software Version Number 50 Default Setting lt Version gt The software version number Definition The setting of S Register 0 is the software version number For example a setting of 040 is Version 4 0 and a setting of 041 is Version 4 1 Available Settings The setting of S Register 0 is factory set and cannot be changed 7 Modem Operating Parameters S Registers 7 4 BENTHOS User s Manual P N 003452 Rev E Acoustic Telemetry Modems 7 5 Doppler Tracking 51 Default Setting 00 Doppler tracking is disabled Definition The setting of S Register 1 determines whether Doppler tracking is enabled or disabled At the start of each transmitted data packet a check for a Doppler shift is made If a Doppler shift is detected a Doppler correction is made If Doppler tracking is enabled then Doppler corrections are made continuously throughout the entire packet If Doppler tracking is disabled no further Doppler corrections are made Available Settings There are two available settings for S Register 1 as listed below 00 Disables Doppler tracking 01 Enables Doppler tracking Special Considerations When setting S Register 1 take note of the following Doppler correction is effective to 20
9. 0 0 Kts 120 Remote 299v Remote Datalogger Empty Full Low High Signal Noise I 5 9 corresponding drop down list box until the desired setting is displayed When changed the display turns blue Then click SET When the new power level is set the display turns back to black Relative Speed Displays the relative speed in knots between the local and remote modems To select the units of relative speed select Configuration from the Menu bar and then choose Speed Units A positive number indicates the modems are moving closer together a negative number indicates the modems are moving farther apart Range Displays the range between the local and the online remote modem s transducers To select the units of range and the sound velocity used in the calculation of range select Configuration from the Menu bar and then choose Range Options To display the range select Acoustic Communication from the Menu bar and then choose Get Range Battery Voltage Displays the local and the online remote modem s power supply voltages Remote Datalogger Displays the relative amount of data stored in the remote modem s data logger memory from empty to full Signal and Noise Levels Displays the relative levels of the received signal and noise from low to high The Main Window 5 10 User s Manual BENTHOS Data Displays As shown in Figure 5 2 on page 5 6 th
10. 5 35 Checking the Data Logger Memory of the Remote Modem 5 35 Downloading the Contents of the Remote Modem s Data Logger Memory to a File 5 36 Clearing the Contents of the Remote Modem s Data Logger Memory 5 37 xii BENTHOS Capturing Received Data from the Remote Modem cee ie eel RE x an vu 5 38 Uploading Data from a File to the Remote Modem E AES 5 39 Sending a Break to the Remote Modem 5 40 Operating a SMART Release 5 41 Checking the Status of a SMART Release 5 41 Activating the Release Mechanism of a SMART Rel6aS6 sv ru a o A ui bla pan 5 42 Modem Diagnostics 5 44 Checking the Battery Pack Voltages 5 44 Viewing the Background Noise Level of the Local Modem i is aa da O ned REA E eee va 5 45 Performing the Ping Test 5 46 Checking the Local Modem s Firmware Version Number iis ha wean N RP Rte nw nh 5 47 6 Modem Operating Modes and Commands 6 1 Operating 6 1 Online Mode 6 2 Device Enable css nae a b LARA date 6 3 Transmit Data Bulffers
11. Activates the release mechanism of the SMART Release at address n with release code m P N 003452 Rev E Acoustic Telemetry Modems 6 15 Online Interrupt Syntax Definition The Online Interrupt command causes the local modem to go into Command mode When a local modem is in Online mode and is online with a remote modem every character that is input to the local modem from its host processor over the serial interface is transmitted to the remote modem Similarly every character that is input to the remote modem from its host processor over the serial interface is transmitted to the local modem However if the characters are typed in rapid succession when the local modem is not transmitting or receiving data either over the serial interface or over the acoustic link the modem will switch to Command mode and the remote modem will remain in Online mode Similarly when the local modem is in Datalogger mode every character that is input to the modem from its host processor over the serial interface is stored in the modem s data logger memory And if the characters are typed in rapid succession when the modem is not transmitting or receiving data either over the serial interface or over the acoustic link the local modem will switch to Command mode WARNING If is entered after data have been input to the modem over the serial interface but before the forwarding delay has elapsed the data will be lost
12. Definition The Output Local Page command causes the local modem to output the contents of page n of its data logger memory over the serial interface The range of page numbers is from 1 to 11 and each page contains a maximum of 64 kbytes of data NOTE For the local modem to execute entered commands the modem must be in Command mode with the command prompt gt displayed If the modem is not in Command mode refer to page 6 11 for instructions on how to place the modem into Command mode How to Use To use the Output Local Page command type ATBP followed by the selected data logger page number of the local modem s data logger memory The local modem will output the contents of the selected data logger page over the serial interface Special Considerations When using the Output Local Page command take note of the following The contents of the local modem s data logger page do not change when it is output over the serial interface While the contents of the local modem s data logger page are being output the local modem will not accept any input over the serial interface or over the acoustic link 6 Modem Operating Modes and Commands Entering Commands 6 72 BENTHOS User s Manual P N 003452 Rev E Acoustic Telemetry Modems 6 73 AGC Diagnostic ATTNn Syntax ATTNn Enter Definition The AGC Diagnostic command enables or disables the display of the automatic gain control AGC output of the loc
13. The setting of S Register 6 determines the transmit power level of a modem Available Settings The range of settings for S Register 6 is from 01 to 08 for a range of 0 dB to 21 dB of attenuation in 3 dB steps where dB is the maximum transmit power level and 21 dB is the minimum transmit power level as follows 01 21 dB minimum transmit power 02 18 dB 03 15 dB 04 12 dB 05 09 dB 06 06 dB 07 03 dB 08 00 dB maximum transmit power Special Considerations When setting S Register 6 take note of the following The transmit power of the modem can be changed remotely with the Remote Power command AT Pn m To maximize the modem battery pack life use the lowest power setting that yields good communications 7 Modem Operating Parameters S Registers 7 16 BENTHOS User s Manual P N 003452 Rev E Acoustic Telemetry Modems 7 17 Acoustic Response Timeout 57 Default Setting 15 The local modem will wait 7 5 seconds after sending an acoustic command to a remote modem for the remote modem to acknowledge receipt of the command Definition The setting of S Register 7 determines the acoustic response timeout which is the time during which a local modem will wait for an acknowledgment to an acoustic command sent to a remote modem If no acknowledgment is received the local modem will output the results message Response Not Received Available Settings The range of settings for S Register
14. To change the transmit power level of the online remote modem click the up or down arrow in the drop down list box in the Remote Power Level Status display in the Main window until the desired setting is displayed Then click SET P N 003452 Rev E Acoustic Telemetry Modems 5 35 Changing the Acoustic Transmit Baud Rate of the Local and Remote Modems To change the acoustic transmit baud rate of the local modem click the up or down arrow in the Downlink drop down list box in the Acoustic Baud Rate Status display in the Main window until the desired setting is displayed When changed the display turns blue Then click SET When the new baud rate is set the display turns back to black To change the acoustic transmit baud rate of the online remote modem click the up or down arrow in the Uplink drop down list box in the Acoustic Baud Rate Status display in the Main window until the desired setting is displayed Then click SET Enabling and Disabling the Data Logger of the Remote Modem The data logger of the online remote modem can be enabled or disabled When the data logger is enabled the modem is in Datalogger mode and input from its host processor over the serial interface is treated as data and stored in the modem s data logger memory To enable the data logger of the remote modem choose Datalogger gt Enable Datalogger To disable the data logger of the remote modem choose Datalogger gt Disable Datalogger Checking
15. 1066 bits sec MFSK with rate 1 2 convolutional coding and 3 125 ms multipath guard period 07 1200 bits sec MFSK with rate 1 2 convolutional coding 7 Modem Operating Parameters S Registers 7 12 BENTHOS 08 2400 bits sec MFSK 09 2560 bits sec PSK with rate 1 2 convolutional coding 10 5120 bits sec PSK with rate 1 2 convolutional coding 11 7680 bits sec PSK with rate 1 2 convolutional coding 12 10 240 bits sec PSK 13 15 360 bits sec PSK Special Considerations When setting S Register 4 take note of the following To maximize the modem battery pack life for the amount of data transmitted use the highest acoustic baud rate that yields good results When selecting a baud rate that includes a multipath guard period the selection should include the multipath guard period that is longer than the multipath delay The multipath delay is measured and displayed as a part of the received data statistics when using the Acoustic Link Test command ATXn The transmitting acoustic baud rates of settings 09 13 can be received by an ATM 890 Series Acoustic Telemetry Modem only User s Manual P N 003452 Rev E Acoustic Telemetry Modems Reserved 7 Modem Operating Parameters S Registers 7 14 BENTHOS User s Manual P N 003452 Rev E Acoustic Telemetry Modems 7 15 Transmit Power Level 56 Default Setting 08 The transmit power level of the modem is set to 0 dB which is the highest power level Definition
16. 131 512 byte message no display 132 1024 byte message no display 133 2048 byte message no display 134 4096 byte message no display 135 7 Modem Operating Parameters S Registers 8 byte message w display 32 byte message w display 128 byte message w display 256 byte message w display 512 byte message w display 1024 byte message w display 2048 byte message w display 4096 byte message w display 7 28 BENTHOS User s Manual P N 003452 Rev E Acoustic Telemetry Modems 7 29 Verbose Level 13 Default Setting 01 The verbose level of the modem is set to the level which displays data and some diagnostic messages Definition The setting of S Register 13 determines whether only data or data and other information when received by the local modem are displayed NOTE Should a fatal error occur it is displayed regardless of the setting of S Register 13 Available Settings The range of settings for S Register 13 is from 00 to 04 as listed below 00 Only data are displayed 01 Data and some diagnostic messages are displayed 02 Data most diagnostic messages and received data statistics are displayed 03 Data additional diagnostic messages and received data statistics are displayed 04 For factory use only With a setting of 02 or higher data along with received data statistics are displayed in the following general format Source xx Destination xx CRC Pass Fail MPD x
17. ATM 885RPCB HF ATM 885RPCB modem board set HF Table 10 6 Cables DESCRIPTION 009666 PART NUMBER 0 5 m serial power cable for use with subsea modems C 270 11 25 m transducer deck cable for use with ATM 891 010190 50 m transducer deck cable for use with ATM 891 010191 75 m transducer deck cable for use with ATM 891 2 m transducer cable for use with ATM 885R and ATM 887R 010192 007810 10 m transducer cable for use with ATM 885R and ATM 887R 008363 25 m transducer cable for use with ATM 885R and ATM 887R 008364 RD Instruments ADCP interface cable B 270 71 User s Manual P N 003452 Rev E
18. Drawings for detailed dimensional information on the subsea modems When a subsea modem is moored it should be securely anchored using a clump weight And if it is moored or attached to a subsea structure it should be pulled up vertically using flotation The side bar that is attached to the modem housing is used both to attach the flotation and to anchor the modem to a clump weight or a structure Mounting Instruments to the ATM 888 Subsea Modem Small instruments can be mounted directly on the ATM 888 Acoustic Telemetry Modem A typical configuration might be a cylindrical instrument mounted on the strongback opposite the modem housing For example stainless steel hose clamps or plastic tie wraps may be used to mount an instrument to the strongback using the existing slots provided for this purpose Mounting holes may also be drilled into the middle part of the flanges of the strongback to facilitate bracket or strap mounting Be sure to mount the instruments in a way that does not distort the shape of the PVC housing or dislodge it from the strongback WARNING Do not place stresses on the housing by fastening bands around it or by clamping anything directly to it These stresses could distort the housing and cause a leak to occur Similarly do not attach hose clamps around both the housing and the strongback as doing so also could cause a leak to occur 3 Deployment Considerations Typical Deployment Configurations Acoustic Telemet
19. Refer to Figure 4 4 on page 4 6 for the location of the modem on off switch Using a flat head screwdriver loosen the stainless steel band clamp on the transducer end cap for an ATM 887 Acoustic Telemetry Modem or the remote transducer connector end cap for an ATM 887R Acoustic Telemetry Modem Slide the band clamp down along the housing out of the way With the modem on its side and resting on a flat surface carefully pull the end cap straight out from the housing far enough to access the connectors on the circuit board If required rotate the end cap slightly while pulling 8 Maintenance and Troubleshooting Changing the Modem Battery Packs 8 6 User s Manual BENTHOS Disconnect the 5 pin power and 10 pin serial cable connectors that connect to the circuit board and set the end cap assembly aside Using a flat head screwdriver loosen the stainless steel band clamp on the POWER SERIAL connector end cap Slide the clamp down along the housing and out of the way Carefully pull the end cap straight out completely removing it and the battery tray with the installed batteries from the housing If required rotate the end cap slightly while pulling 7 Remove the tape that holds the batteries in the battery tray 8 One at a time remove the two batteries from the battery tray and then 10 11 12 13 14 15 remove the tape that secures the in line connectors and disconnect the packs
20. Remote Datalogger Empty Full Signal Noise DEMO 1072272002 2 15 PM di Start Benthos Telesonar ed TelesonarPC can also be started by clicking the TelesonarPC icon onthe Windows desktop NOTE If a modem has been connected to the PC as described in Setting Up the Modems on page 4 7 and the Check Modem Connection dialog box still appears as shown above the serial communications port may not be configured correctly To configure the port Click Commport select the correct baud rate and COM port in the PC Communications dialog box that opens and then click SET to save the new selections When the Main window opens and if a modem is connected to the PC and the correct baud rate and COM port are set the modem has automatically gone online with the remote modem whose address is displayed in the Remote ID Status display of the Main window However if there is no remote 5 TelesonarPC Installing and Starting TelesonarPC 5 4 User s Manual BENTHOS modem or if the address of the remote modem is incorrect or not known the Remote Modem window shown in Figure 5 1 also opens Remote Modem Warning No Remote Modem Detected Verify that Remote Modem ID is Correct and or Adjust Local Power and Retry Remote ID Local Power 001 FULL RETRY SEARCH IGNORE Figure 5 1 The Remote Modem Window In the Remote Modem wi
21. When using an AT 408 Omnidirectional Transducer which has an omnidirectional beam pattern the potential for multipath is the greatest yet it is not required to point the transducer at the receiving modem Use of an Acoustic Baffle For installations with relatively high multipath and ambient noise conditions such as surface and bottom multipath reflections ship noise sea state noise and other nearby acoustical noise sources an acoustic baffle can be installed on the transducer The acoustic baffle minimizes the effects of multipath signals and noise sources that arrive from behind the remote transducer Acoustic baffles are available for all the remote transducers Refer to Customer Service on page vi for information on how to contact Benthos for detailed specifications Height Above the Bottom and Distance Below the Surface Adjusting the height of the remote transducer above the bottom for fixed bottom installations can reduce the effects of multipath Generally raising a transducer that is close to the bottom such that it is two or three meters above the bottom will usually reduce multipath from bottom reflections Similarly for a remote transducer that is near the surface lowering the transducer will generally reduce the effects multipath from surface reflections and reduce the effects of both ship noise and surface noise Other Acoustic Equipment If there is other active acoustic equipment in the vicinity of a modem which
22. built in preamplifier and transmitter In addition to the four main groups two circuit board configurations are available for use in OEM applications One configuration comprises a complete modem board set and a transducer The other configuration comprises a modem board set without the transmitter and is for use with one of the remote transducers NOTE The terms remote modem and local modem are used often in this manual and their meaning is provided in several places However a remote transducer is a transducer that connects to a modem whether it is considered to be a local modem or a remote modem Surface Modems The surface modems which can be used with any of the remote transducers include the following ATM 891 Deck Box Connects to a surface host processor and can transmit and receive data at baud rates as high as 15 360 bits sec ATM 880 Module Designed for installation on surface buoys User s Manual P N 003452 Rev E Acoustic Telemetry Modems 1 3 1 Overview ATM 891 Deck Box The ATM 891 Deck Box which is an ATM 890 Series Acoustic Telemetry Modem is shown in Figure 1 1 The deck box which is watertight with the cover closed is used to communicate with any of the subsea modems or SMART Releases or another deck box using one of the remote transducers as a dunking transducer The ATM 891 Deck Box can also activate the release mechanism of a SMART Release It is powered with 100
23. clearing the contents of data logger memory P N 003452 Rev E Acoustic Telemetry Modems 7 21 Coprocessor Board 59 Default Setting 00 The Coprocessor Board is disabled or is not installed in the modem Definition The setting of S Register 9 determines whether the Coprocessor Board is installed and enabled Available Settings There are two available settings for S Register 9 as listed below 00 Disables the Coprocessor Board 01 Enables the Coprocessor Board Special Considerations When setting S Register 9 take note of the following Only ATM 890 Series Acoustic Telemetry Modems have a Coprocessor Board installed The Coprocessor Board must be enabled for the modem to receive at the high baud rates of 2560 15 360 bits sec Enabling the Coprocessor Board when the board is not present causes the setting of S Register 9 to reset to 00 automatically When setting S Register 9 to 01 the modem will respond with the message coprocessor ver x x if the Coprocessor Board is installed and fully operational When setting S Register 9 to 01 the modem will respond with the message coprocessor error if the Coprocessor Board is not installed or is installed and not fully operational 7 Modem Operating Parameters S Registers 7 22 BENTHOS User s Manual P N 003452 Rev E Acoustic Telemetry Modems 7 23 idle Time 10 Default Setting 36 If the local modem does not receive input from its host proces
24. considerations to ensure the best possible modem performance Section 4 Setup and Test provides instructions for unpacking setting up and testing the modems and includes some simple procedures to verify that commands and data are correctly transmitted and received Section 5 TelesonarPC provides installation and operating instructions for TelesonarPC a graphical users interface GUI that provides a user friendly means of configuring and operating the modems in a Windows environment Section 6 Modem Operating Modes and Commands describes the modem operating modes and provides detailed descriptions of the modem commands and how to use them Section 7 Modem Operating Parameters S Registers provides detailed descriptions of the modem operating parameters or S Registers and how to set them Section 8 Maintenance and Troubleshooting provides instructions for cleaning and inspecting the modems changing the battery packs and troubleshooting operational problems that might occur during setup Section 9 Drawings includes outline drawings of the modems to assist in their installation and setup Section 10 Modem Components and Accessories Includes lists of the available ATM 880 and ATM 890 Series Acoustic Telemetry Modem components along with cables and OEM kits vi BENTHOS Notes and Warnings Where applicable special notes and warnings are presented as follows NOTE A referral to another part of this manual or t
25. packet retry or DISABLE to disable packet retry NOTE To reset all the settings to their factory default settings click Factory Reset Click Set to close the Predeployment Configuration dialog box A TelesonarPC window opens asking whether to store the changes and exit the program Telesonar PC Store All Changes and Exit Program ES cue Click OK to store the changes and exit TelesonarPC or click Cancel to close the window without saving any changes and leave TelesonarPC running Disconnect the modem from the PC The modem is ready for deployment P N 003452 Rev E Acoustic Telemetry Modems 5 25 5 TelesonarPC Advanced Remote Modem Settings The advanced remote modem settings determine the remote modem s frequency band Typically this setting is made at the factory and does not require changing However it can be changed if necessary In addition this setting can only be made with the modem connected to the PC It cannot be set remotely WARNING Changing the frequency band may degrade performance To ensure optimum performance verify that the new setting matches the frequency band LF MF or HF of the modem or the modem and its remote transducer To change the remote modem s frequency band 1 Connect the modem to the PC and start TelesonarPC 2 Choose Predeployment gt Configure Modem The Predeployment Configuration dialog box shown in Figure 5 11 on page 5 22 opens 3 Click Advanc
26. 120 VAC 50 60 Hz 200 240 VAC 50 60 Hz or external 21 28 VDC and includes AC and DC power cables and a choice of a 25 50 or 100 meter transducer cable The deck box can be connected to a host processor through its RS 232 422 serial port and includes a speaker and volume control for audio verification of transmitted data The deck box is also available in a choice three frequency bands 9 14 kHz LF 16 21 kHz MF and 25 30 kHz HF These configurations provide additional noise filtering for enhanced performance in a noisy operating environment Model ATM 880 Module The ATM 880 Module which is an ATM 880 Series Acoustic Telemetry Modem is designed to be installed on a surface buoy It is housed in a NEMA weather resistant enclosure and includes a connector for one of the remote transducers an RS 232 serial port connector for connecting to a host processor on the buoy and an external DC power connector When installed on a surface buoy and controlled by the host processor the modem can communicate with other deployed modems Information received from those modems is output to the host processor and can be transmitted over an RF link to a remote station Similarly the deployed modems can receive information from the remote station mm F F I lt F
27. 232 Receive Host to Modem Modem to Host Host to Modem Modem to Host Host to Modem FUNCTION TXD RX RS 232 Transmit RS 422 Receive RTS RX Request to Send RS 422 Receive GND Common Ground TX RS 422 Transmit Modem to Host TX RS 422 Transmit Modem to Host 12 VDC DC Power for host processor Modem to Host 4 Setup and Test Setting Up the Modems 4 8 BENTHOS Perform the steps listed below to connect a remote transducer and a PC to an ATM 891 Deck Box Refer to ATM 891 Deck Box Front Panel Connectors on page 4 4 for information on the deck box connectors and their locations 1 Connect the supplied 25 meter transducer cable from the TRANSDUCER connector on the deck box to the bulkhead connector on the remote transducer that is to be used as the dunking transducer 2 If AC power is to be used connect the supplied AC power cable to the AC POWER connector on the deck box If DC power is to be used connect the supplied DC power cable to the banana jack binding posts connecting 21 28 VDC to red and common to black 3 Connect an RS 232 serial cable from the SERIAL I O connector on the deck box to an available serial COM port on the PC Refer to Table 4 1 on page 4 7 for the connector pinout information A straight wire pin for pin connection to the PC s serial COM port is what is required Table 4 2 ATM 891 SERIAL I O Connector to DB 9 Pin to Pin Connections HO
28. 563 1000 FAX 508 563 H444 23 50 CONFIDENTIAL BENTHOS DECIMAL Y 015 This document and the information 49 Edgerton Drive XX 010 contained therein is proprietary and North Falmouth MA 02556 U S A XXX 005 confidential to Benthos Inc and moy TITLE FRACTIONAL not be used reproduced or disclosed 1 64 PU Ee without the express written consent U LI N E 5 4 2 1 F EE DONE INTERROGATOR R010 APPROVED BY A875 09248 Od aspi s notes PRAWNG FILE NAME 887509948 DWG 2 20 98 sem o m REVISION 21 6 SOHLN38 Acoustic Telemetry Modems 10 1 10 Modem Components and Accessories This section includes lists of the available ATM 880 and ATM 890 Series Acoustic Telemetry Modem components along with cables and OEM kits Table 10 1 Acoustic Telemetry Modems Surface MODEL NUMBER DESCRIPTION PART NUMBER ATM 891 Deck Box No Filter 010158 ATM 891 LF Deck Box LF 010926 ATM 891 MF Deck Box MF 010927 ATM 891 HF Deck Box HF 010928 ATM 880 NEMA Housing 009563 Table 10 2 Acoustic Telemetry Modems Subsea 2000 m MODEL NUMBER DESCRIPTION PART NUMBER ATM 885 LF O Modem LF omni 009262 ATM 885 MF O Modem MF omni 009264 ATM 885 HF O Modem HF omni 009261 ATM 885 MF D Modem MF directional 009263 ATM 885R LF Modem remote transducer LF 009265 ATM 885R MF Modem remote transducer MF 010225 ATM 885R HF Modem remot
29. 91 2nsnooy 6 6 jenuew sasn 3 A9Y 25700 Nid DE Drive North MA 02556 U S A TEL 508 563 1000 FAX 508 563 6444 ber as woreo CONFIDENTIAL DECIMAL 015 This document ond the information XX 010 contained therein is proprietary ond XXX 005 confidential to Benthos Inc and may FRACTIONAL Hole size not be used reproduced or disclosed 1 64 amp location without the express written consent 1 32 General of Benthos BENTHOS 49 Edgerton Drive North Falmouth MA 02556 U S A OUTLINE AT 408 len R 010 3 REVISION APPROVED BY A8 5 08689 Od exer os nated PRAMNG FLE NAVE A87 508689 DWG 2720 98 01 6 SOHLN38 SBUIMEJG 6 leet xs CONFIDENTIAL 15 This document and the information XX 010 contained therein is proprietary and North Falmouth MA 02556 U S A 005 confidentiol to Benthos Inc ond moy not be used reproduced or disclosed amp locotion without the express written consent OUTLINE AT 421 TRANSDUCER U775421 08716 ECO NO DESCRIPTION 2 9 9 NIS ee i 1 swopow 391WU9 91 2nsnooy LL 6 jenuew sasn 3 ed 25700 Nid DATE REVIECO NQ DESCRIPTION DR CHK 01 06 01 8281 UP DATED TO BENTHOS FORMT GC Q BENTOS Neth UA 02556 U S A N TEL 508
30. ATM 885RPCB Transducer Connections The ATM 885RPCB connects to any of the remote transducers A bulkhead connector wiring assembly is supplied for connecting to the ATM 885RPCB The bulkhead connector is a Subcon MCBHBF which connects to the transducer cable supplied with the remote transducer Refer to Table 4 9 and connect the bulkhead connector wiring assembly to J7 on the Interface Board and to J1 on the Power Supply Filter Board Connect the remote transducer cable to the bulkhead connector wiring assembly and to the bulkhead connector on the remote transducer Table 4 9 ATM 885RPCB Bulkhead Connector Wiring INTERFACE SUPPLY FILTER A BOARD J7 BOARD J1 FUNCTION WIRING ASSEMBLY Transmit Power Transmit Power Transmit On Off Transmit Signal Power Control Analog Ground Shield Conductor User s Manual P N 003452 Rev E Acoustic Telemetry Modems 4 15 Setting up the ATM 880 Module Setting up the ATM 880 Module requires the same power serial interface and transducer connections as the subsea modems Refer to Setting up the Subsea Modems on page 4 9 for instructions The POWER SERIAL connector is located on the side of the ATM 880 Module Setting up the Host Processor If a PC is to be used as the host processor it must be set up to run a terminal program such as ProComm Plus which is available from DataStorm Technologies or Hyperterminal which is
31. Connect the in line connectors of the new batteries and secure the connectors with tape Install the batteries into the battery tray one at a time label side out tucking the battery wires out of the way one between the battery pack and the battery tray bulkhead and the other between the two packs Tape the batteries in place using packing or electrical tape Inspect the O rings on both end caps They should be free of any scratches nicks or dirt Inspect the O ring surfaces on the housing They should also be free of any scratches nicks or dirt Wipe the O rings clean with an alcohol wipe and apply a light coat of silicone lubricant Replace any O ring that appears cracked or nicked When replacing an O ring first clean the O ring surface on the housing with a clean lint free cloth or paper towel and then apply a thin coat of silicone lubricant to the new O ring before installing it onto the end cap Feed the wire harness through the housing and slide the battery pack into the housing until the gland seal O ring on the end cap is against the housing Be careful not to scrape the O ring surface on the inside wall of the housing When the gland seal O ring is against the housing apply equal pressure against the end cap and press it into the housing until the face seal O ring is firmly seated against the housing If required rotate the end cap slightly when pressing it into the housing Slide the stainless steel band clamp back
32. Dimensions Mounting 7 1 cm 2 8 in wide by 6 6 cm 2 6 in high by 22 3 cm 8 8 in long Chassis mounting holes P N 003452 Rev E Acoustic Telemetry Modems 2 11 Power Requirements External DC input power 14 28 V Lowpower state current 0 5 mA typical 1 0 mA maximum DSP receiver current active 25 mA typical Transmitter current active 1 A average A peak 21 V MF HF 2 A average 5 A peak 21 V LF Input Output Power External DC power input Signal RS 232 422 serial interface data Transducers AT 408 or AT 421 Device enable Active low open collector output Maximum sink current is 80 mA Maximum applied voltage is 40 VDC Transducers Available types AT 408 omnidirectional LF MF and HF AT 421 directional LF and MF AT 408 Omnidirectional Transducer The AT 408 is an omnidirectional transducer with a built in preamplifier and transmitter It can be used as a dunking transducer with the ATM 891 Deck Box or as a remote transducer with the ATM 885R Acoustic Telemetry Modem or the ATM 885RPCB Modem Board Set Frequency bands 9 14 kHz LF 16 21 kHz MF or 25 30 kHz HF Source level 21 V typ 178 dB re 1 uPa 1m MF HF 185 dB re 1 uPa 1m LF Source level 14 V typ 3 dB down from source level at 21 V Preamp gain 35 dB 2 Specifications AT 408 Omnidirectional Transducer 2 12 Radiation pattern Housing construction Dimensions Weight in air Weig
33. RECEIVE INPUT FROM FILTER ADD J5 TO DSP X 015 This document and the information XX 010 contained therein is proprietary and not be used reproduced or disclosed amp location Without the express written consent TJA KS RDS 1 32 General N 8896 UPDATE DRAWING GC JC RDS FOR BAND C OMNI swopow 391WU9 91 2nsnooy OUTLINE ATM 885 PCB OEM BOARD SET B875 08659 BENTHOS FORMAT reinen 65 rur Var 687 5086505H10 DN6 276 98 2 6 jenueyy sasn 3 A9Y 25700 N d E 2 3 4 DIA 6 PIGTAIL CONNECT TO J2 OF TRANSMITTER BOARD CUSTOMER TO SUPPLY BULKHEAD CONNECTOR A TRANSDUCER P N LF OMNI 3 900 001874 MF OMNI 2 875 REF 2 MF DIR 4 500 REF 5 5 HF OMNI 2 750 1 6 A BAND OMNI n 04 07 04 A gt TOLERANCES EXCEPT AS NOTED CON FI D ENTIAL CHANGES TO TM DECIMAL X 015 This document and the information Drive 1 XX 010 contained therein is proprietary and North Faimouth MA 02556 U S A NEW P N XXX_ 005 confidential to Benthos Inc and TLE 07 16 03 A 9676 00 NEW PLN wages used reproduced or disclosed OUTLINE DWG 1 64 y location Without the express written consent OUTLI N 885 PC
34. Remote Power command take note of the following To display the message OK and many other messages S Register 13 must be set to either 01 or 02 where 01 is the factory default setting The local modem must receive an acknowledgment from the remote modem within the acoustic response timeout which is determined by the setting of S Register 7 If an acknowledgment is not received Response Not Received will be displayed The Remote Baud Rate command sets S Register 4 of the remote modem to the selected value e Settings 09 13 are available for an ATM 890 Series Acoustic Telemetry Modem only P N 003452 Rev E Acoustic Telemetry Modems 6 35 Read Register ATSn Syntax ATSn Enter or ATS Enter Definition The Read Register command causes the local modem to display the setting of its S Register n or if the S Register number is not specified the settings of all its S Registers Ca NOTE For the local modem to execute entered commands the modem must be in Command mode with the command prompt gt displayed If the modem is not in Command mode refer to page 6 11 for instructions on how to place the modem into Command mode How to Use To use the Read Register command type ATS and the number of the S Register that is to be read followed by a question mark Or type ATS to read all the S Registers and then press Enter The local modem will display its S Register setting or settings An example that u
35. The setting of S Register 8 determines the forwarding delay How to Use To use the Online Interrupt command type rapidly The local modem will indicate that it has gone into Command mode by displaying the command prompt gt 6 Modem Operating Modes and Commands Entering Commands 6 16 User s Manual BENTHOS Special Considerations The Online Interrupt command uses three plus characters typed in rapid succession because of the low probability that a string of three plus signs would be part of any data stream To further ensure that these characters are not part of a data stream the local modem requires three additional conditions for recognizing an interrupt 1 There are no characters entered before the first plus sign is entered for a period that is longer than one second 2 There are no other characters entered between entering any two plus signs 3 The time interval between entering any two plus signs is less than one second The three conditions are shown graphically in Figure 6 1 No Characters No Characters No Characters gt One Second lt One Second lt One Second Figure 6 1 Conditions for Recognizing an Online Interrupt Command P N 003452 Rev E Acoustic Telemetry Modems 6 17 Attention AT Syntax AT Enter Definition The Attention command resets the local modem s idle time timer and verifies that the communications link between the host processor and the modem
36. This section provides instructions on how to install and start TelesonarPC and describes its many features and how to use them Installing and Starting TelesonarPC 5 TelesonarPC TelesonarPC is installed using the TelesonarPC Setup program which is started by choosing Run in the Start menu After installation TelesonarPC can be started Instructions on how to install start check the version number exit from and uninstall TelesonarPC are provided below Installing TelesonarPC To install TelesonarPC 1 Exit all programs and turn off any virus protection or screen saver software 2 Insert the TelesonarPC for Windows CD into the CD ROM drive 3 Select Start gt Run The Run dialog box opens Run Type the name of a program folder document or Internet A resource and Windows will open it for you Open setup 7 Cancel Browse Installing and Starting TelesonarPC 5 2 BENTHOS 4 Enter d setup in the Open text box where d is the drive letter of the CD ROM drive and then click OK The first TelesonarPC Setup dialog box opens 2 TelesonarPC Setup A Welcome to the TelesonarPC installation program Z Setup cannot install system files or update shared files if they are in use Before proceeding we recommend that you close any applications you may be running 5 Click OK The second TelesonarPC Setup dialog box opens 2 TelesonarPC Setup Begin the installation by clicking the
37. Voltage Local Remote User s Manual av zv Remote Datalogger Empty Signal Noise com1 ONLINE LOWFREQ BAND CAPTURE OFF 10 22 4002 2 44 PM A Start IE Benthos Teleson Status bar Input display Figure 5 2 The Main Window Menu Bar The Menu bar provides access to all of the modem commands through pull down menus To open a menu from the Menu bar place the mouse pointer on the menu name to select it and then click the left mouse button The menu opens as shown in Figure 5 3 which shows the opened Datalogger menu To choose an item from an open menu place the mouse pointer on the item to select it and then click the left mouse button Although most of the items in a menu are commands or options some may be the names of submenus in which case a triangle F follows the item Selecting the item opens the submenu P N 003452 Rev E Acoustic Telemetry Modems 5 7 5 TelesonarPC n Configuration Detelogger File Transfer Diagnostic Help Enable Datalogger Terminal Check Remote Buffer f Clear Remote Buffer Figure 5 3 The Opened Datalogger Menu Some menu items when chosen open a window or a dialog box which may include many of the standard Windows features check boxes option buttons drop down list boxes command buttons and text boxes Some menu items are options that can be enabled or disabled When enabled a check mark ky precedes Enabled when
38. acoustic link after deployment The procedure is similar to that provided for configuring the serial port before deployment To configure a remote modem s serial port after deployment 1 Select the address of the remote modem in the Remote ID Status display and then click SET The local modem goes online with the remote modem 2 Choose Configuration gt Remote Modem The Remote Modem Configuration dialog box shown in Figure 5 12 on page 5 26 opens 3 Click Serial Port The Serial Port Configuration dialog box shown in Figure 5 13 opens e Serial Port Configuration r Baud Rate CommPort 19200 bps Comm 1 9600 bps C Comm2 4800 bps C Comm3 2400 bps Comm 4 C 1200 bps Handshaking Serial D iver NONE gir 6 RTS 7 CTS Low Power s C RTS CTS C XOFF Echo Echo OFF C Echo ON Figure 5 13 The Serial Port Configuration Dialog Box User s Manual P N 003452 Rev E Acoustic Telemetry Modems 5 29 gt 5 TelesonarPC 4 5 O Mom NOTE The COM port setting in the CommPort area of the Serial Port Configuration dialog box cannot be changed remotely and therefore is unavailable In the Baud Rate area of the Serial Port Configuration dialog box select the baud rate In the Serial Driver area select the serial interface NOTE Selecting RTS CTS Low Power turns off the RS 232 driver when the modem is in t
39. and Deployment Length Calculations on page 5 11 for information on how to calculate battery pack capacity usage Click Continue to select or to create the file to which to save the data or click Cancel to close the Datalogger Download Time window Clicking continue opens the Datalogger File dialog box shown in Figure 5 14 Click the arrow in the Save in drop down list box and select the folder in which to save the data file In the File name text box enter the name of the file in which to save the data P N 003452 Rev E Acoustic Telemetry Modems 5 37 DataLogger file i2 x Save in Downloaded data logger files c f Data logger file 1 log Data logger file 2 109 E Data logger file 3 log File name Data logger file 4 Save as type all Files Cancel 2 Figure 5 14 DataLogger File Dialog 6 Click Save to save the data to the specified file and close the DataLogger File dialog box The Downloading Datalogger window opens and the contents of the remote modem s data logger memory are downloaded to the file The progress bar in the Downloading Datalogger window displays the progress of the downloading process When downloading is finished the Download Complete window opens 7 To close the Download Complete window click OK Clearing the Contents of the Remote Modem s Data Logger Memory The contents of the data logger memory of the online remote mod
40. at address n ATSn n Enter Set Register Sets the local modem s S Register number n to the value entered following AT amp W Enter Write Saves the local modem s S Register settings as the new startup configuration P N 003452 Rev E Acoustic Telemetry Modems 6 13 Table 6 1 ATM 880 and ATM 890 Series Acoustic Telemetry Modem Command Set Continued Command Syntax Command Name Result ATL Enter Lowpower State Forces the idle time of the local modem to expire which in turn causes the modem to go into the lowpower state ATRn Enter Range Displays the range from the local modem to the remote modem at address n AT Dn m Enter Remote Doppler Tracking Enables or disables Doppler tracking of the remote modem at address n ATV Enter Local Battery Voltage Displays the DSP receiver and transmitter power supply voltages of the local modem AT Vn Enter Remote Battery Voltage Displays the DSP receiver and transmitter power supply voltages of the remote modem at address n AT BEn Enter Remote Data Logger Enable Causes the remote modem at address n to go into Datalogger mode AT BDn Enter Remote Data Logger Disable Causes the remote modem at address n to go into Command mode if it is in Datalogger mode AT BTn Enter Read Remote Data Logger Displays the contents of the data logger memory
41. be captured or saved to a file in real time and data from a file can be uploaded to a remote modem Telesonar PC also allows a break to be sent from the local host processor to an RD Instruments Acoustic Doppler Current Profiler that is connected to the online remote modem Going Online with a Different Remote Modem To go online with a different remote modem the address of the remote modem must be selected Once selected it remains selected until changed To select the address of the remote modem click the up or down arrow in the scroll box in the Remote ID Status display in the Main window until the desired address is displayed When changed the display turns blue Then click SET When the new address is set the display turns back to black and the local modem is online with the new remote modem NOTE If the remote modem cannot be detected the Remote Modem window shown in Figure 5 1 on page 5 4 opens Follow the instructions in the window to try to detect the remote modem Checking the Acoustic Link between the Local and Remote Modems To check the acoustic link between the local and remote modems 1 Choose Acoustic Communication gt Test The local modem commands the online remote modem to transmit a test message and the test message is evaluated with the results displayed in a TelesonarPC window Operating the Modems after Deployment 5 32 BENTHOS Telesonar PC x 4 Obit errors out of 64 total bits Sound Quality
42. be changed Configuring the Local and Remote Modems 5 20 User s Manual 10 11 12 13 BENTHOS In the Local Modem Configuration dialog box select the address of this modem using the left or right arrow for the Modem ID S18 scroll box In the Remote Modem ID S14 scroll box select the address of the remote modem that this modem will go online with when it is powered up or is awakened from its lowpower state This setting applies only when Operating Mode S15 is set to ON LINE which is the default setting in the Local Modem Configuration dialog box and cannot be changed Select ENABLE in the Doppler Tracking S1 scroll box to enable Doppler tracking or DISABLE to disable Doppler tracking Select DISABLE if the local and remote modems are a fixed distance apart Select the acoustic transmit baud rate in bits sec from the Acoustic Transmit Baud Rate S4 drop down list box Select the transmit power level in decibels in the Transmit Power Level S6 scroll box Select the distance between this modem and the remote modem in meters in the Acoustic Response Timeout S7 scroll box Select the forwarding delay in seconds in the Forwarding Delay S8 scroll box From the Test Packet Size S12 drop down list box select the test packet size in bytes that this modem will command a remote modem to send when the Acoustic Link Test command ATXn is sent to the remote modem Refer t
43. button below Click this button to install TelesonarPC software to the specified destination irectory Directory C Program Files TelesonarPC Change Directory Exit Setup lt 6 Click the Install button to install TelesonarPC in the specified destination directory Or instead click Change Directory and follow the instructions to select a different directory and then click the Install button 7 7 Click Continue the Choose Program Group dialog box that opens TelesonarPC is installed and ready to be started Starting TelesonarPC To start TelesonarPC 1 Select Start gt Programs gt TelesonarPC The TelesonarPC applications menu opens 2 Choose TelesonarPC User s Manual P N 003452 Rev E Acoustic Telemetry Modems 5 3 TelesonarPC starts and the Main window opens as it appears when no modem is connected to the PC Telesonar PC Io x File Predeployment Acoustic Communication Configuration Datalogger File Transfer Diagnostic Help SENTHOS Acoustic Baud Rate SET Downlink 2 Max ee Uplink Check Modem Connection x 000 A BE Warning No Modem Detected evel ser 1 Make sure that modem is powered up rLevel SET 2 Check the connection between the PC Comm port and the modem 3 Adjust Commport Settings as required Commport Demo
44. can be in any format that fits into 8 bit bytes For example the data can be 7 bits with parity 8 bits with no parity or 8 bit binary words However it cannot be 8 bits with parity Online Break A local modem that is connected to a PC will detect a break if it is sent over the serial interface from the PC If the local modem is online with a remote modem it will command the remote modem to send the equivalent break on its serial interface If the remote modem is connected to an RD Instruments Acoustic Doppler Current Profiler ADCP the break will wake up and reset the current meter Therefore the current meter essentially performs in the same manner as it would if it received the break directly from the PC Error Checking With each 4 kbyte data packet transmitted a checksum is calculated and also transmitted The modem that receives the packet also calculates a checksum and compares it to the transmitted checksum If enabled with the setting of S Register 13 the received data statistics comprising the checksum pass or fail results CRC the multipath delay MPD the signal to noise ratio SNR the relative speed between the local and remote modems SPD the automatic gain control output AGC and the corrected channel errors CCERR are displayed Refer to Acoustic Link Test ATXn on page 6 27 for a detailed description of the received data statistics S Register 13 must be set to 02 or 03 for the received data statistics to be di
45. day 500 uA 1 54 Ah Hence the original 13 5 amp hour calculation must now be reduced by 1 54 amp hours to 11 96 amp hours and the total number of days recalculated D 11 96 A h 600 bits sec x 450 1 A 3 229 220 bytes and the total number of packets is now Total number of packets 3 229 220 bytes 592 bytes packet 5 454 packets And again since 1 packet of data transmitted every 30 minutes is equivalent to 48 packets transmitted per day the total number of deployment days is now Total deployment days 5 454 packets 48 packets day 113 6 days 3 Deployment Considerations Modem Battery Pack 3 6 BENTHOS Modem Operating Depth AN The rated operating depth of the subsea modems and remote transducers is typically 2000 meters However the ATM 887 and ATM 887R Acoustic Telemetry Modems and the AT 421 Directional Transducer LF are rated to 6000 meters For custom applications a higher depth rating can be provided Refer to Customer Service on page vi for information on how to contact Benthos should a higher rating be required WARNING Do not subject a subsea modem or remote transducer to a depth that exceeds its rating as damage or destruction of the modem could occur Modem Communications Range The communications range between two ATM 880 or ATM 890 Series Acoustic Telemetry Modems depends on many factors the transmitting modem s source level the depth of the modems the transducer orientations
46. display the message OK and many other messages S Register 13 must be set to either 01 or 02 where 01 is the factory default setting The local modem must receive an acknowledgment from the remote modem within the acoustic response timeout which is determined by the setting of S Register 7 If an acknowledgment is not received Response Not Received will be displayed The Remote Data Logger Enable command sets S Register 15 of the remote modem to 02 6 Modem Operating Modes and Commands Entering Commands 6 54 BENTHOS User s Manual P N 003452 Rev E Acoustic Telemetry Modems 6 55 Remote Data Logger Disable AT BDn Syntax AT BDn Enter Definition The Remote Data Logger Disable command causes the remote modem at address n to go into Online mode and to go online with the local modem if the remote modem is in Datalogger mode gt NOTE For the local modem to execute entered commands the modem must be in Command mode with the command prompt gt displayed If the modem is not in Command mode refer to page 6 11 for instructions on how to place the modem into Command mode How to Use To use the Remote Data Logger Disable command type AT BD followed by the address of the remote modem and then press Enter The local modem will go online with the remote modem if the remote modem is in Datalogger mode and then respond with the message OK Special Considerations When using the Remote Data Logger
47. echo 7 Modem Operating Parameters S Registers 133 128 124 130 141 136 137 138 1200 baud RS 232 w echo 2400 baud RS 232 w echo 4800 baud RS 232 w echo 9600 baud RS 232 w echo 1200 baud RS 422 w echo 2400 baud RS 422 w echo 4800 baud RS 422 w echo 9600 baud RS 422 w echo NE m m m m m NSK WARNING If the baud rate of the modem s serial interface is changed be sure to set the baud rate of its host processor to the same baud rate otherwise it will not be possible for the host processor to establish communications with the modem 7 10 BENTHOS Special Considerations When setting S Register 3 take note of the following When connecting an instrument to the modem and with S Register 3 set to the default 02 for 9600 baud with no echo the instrument s serial port should be configured as follows Baud rate 9600 baud Parity none Data bits 8 Stop bits 1 To have a changed S Register 3 setting take effect enter the Lowpower State command ATL to place the modem into the lowpower state and then enter the Attention command AT to bring the modem out of the lowpower state Or instead use the Write command AT amp W to save the S Register setting as part of the startup configuration then power down and then power up the modem After changing from RS 232 to RS 422 an RS 422 connection is required to switch back to RS 232 The opposite is true after changing from RS 422 to RS 232
48. high bandwidth efficiency and is primarily used when multipath interference is generally minimal such as in the vertical channel The ATM 890 Series uses PSK modulation to both transmit and receive data The ATM 880 Series can transmit data using PSK modulation but receives data using MFSK modulation only MFSK modulation is a spread spectrum modulation process that transmits multiple tones simultaneously MFSK has a maximum baud rate of 2400 bits sec and has good reliability even in a high multipath environment Methods for Increasing Reliability Three methods are provided by the ATM 880 and ATM 890 Series Acoustic Telemetry Modems to increase communications reliability convolutional coding multipath guard period and data redundancy Convolutional coding uses error correcting algorithms that are determined from the data that are to be transmitted Multipath guard period which is used only with MFSK modulation provides a short delay between data frames to allow for the dispersion of the multipath signals And data redundancy essentially repeats the transmission of a series of data bits NOTE Both the modulation technique and the method or combination of methods for increasing reliability are implemented automatically by the modems depending on the selected baud rate To see which technique and method are selected for each of the available baud rates refer to Acoustic Baud Rate S4 on page 7 11 The selections are listed under Avai
49. into position between the end cap and the housing and tighten the clamp P N 003452 Rev E Acoustic Telemetry Modems 8 7 16 Connect the 5 pin power and 10 pin serial cable connectors to the circuit board 17 Slide the chassis into the housing until the gland seal O ring on the end cap is against the housing being careful not to scrape the O ring surface on the inside wall of the housing 18 When the gland seal O ring is against the housing apply equal pressure against the end cap and press it into the housing until the face seal O ring is firmly seated against the housing If required rotate the end cap slightly when pressing it into the housing 19 Slide the stainless steel band clamp back into position between the end cap and the housing and tighten the clamp Troubleshooting If during the setup or deployment of the modems an ATM 880 or ATM 890 Series Acoustic Telemetry Modem does not appear to be functioning properly use the troubleshooting guide in this section for assistance The troubleshooting guide will help to quickly isolate some basic operational problems that could occur However should further help be required contact Benthos directly Refer to Customer Service on page vi for information on how to contact Benthos The troubleshooting guide includes a list of symptoms along with a list of recommended checks designed to lead to the most likely cause When turning on the ATM 891 Deck Box the POWER ON LED do
50. is Very Good you may increase acoustic baud rate or decrease remote power 2 To close the window click OK Ca NOTE When checking the acoustic link in air be sure to vary the separation of the transducers and the transmit power levels of either one or both of the modems as necessary to establish good communications Refer to Changing the Transmit Power Levels of the Local and Remote Modems on page 5 34 for instructions on how to change the transmit power levels Checking the Range between the Local and the Remote Modem s Transducers To check the range between the transducers of the local modem and the online remote modem 1 Choose Acoustic Communication gt Get Range The local modem acquires the range to the remote modem and a window opens with the range information displayed Telesonar PC x i Range to Remote Modem 0 0 0 m 2 To close the window click OK The range is also displayed in the Range Status display in the Main window User s Manual P N 003452 Rev E Acoustic Telemetry Modems 5 33 5 TelesonarPC Auto Ranging between the Local and Remote Modem s Transducers Auto ranging continuously acquires and displays the range between the transducers of the local modem and the online remote modem Auto ranging is especially useful when relocating a SMART Release as it allows a vessel to navigate to a position at which it will be easy to sight the release once it reaches the surface yet ensure it
51. is powered up Detailed information on how to enter modem commands is presented in Section 6 Modem Operating Modes and Commands and detailed information on the S Registers and how to set them is presented in Section 7 Modem Operating Parameters S Registers User s Manual P N 003452 Rev E Acoustic Telemetry Modems 4 17 Perform the steps listed below to verify that the host processor is communicating properly with the modem and the S Registers are initialized 1 Turn on the PC and run the terminal program 2 If the ATM 891 Deck Box is being used as the modem switch the AC ON OFF switch on the front panel to ON or switch on the DC power supply If a subsea modem is being used as the modem switch on the modem by pushing in the switch on the side of the end cap The banner message followed by the command prompt is displayed The message includes the frequency band LF MF HF or Nonstandard the firmware version and the command prompt as shown in the following example for an ATM 891 Deck Box Benthos ATM 89X MF Frequency Band Acoustic Modem Version 5 0 gt Similarly for the ATM 880 Module and all the subsea modems the banner message is as in the following example Benthos ATM 88X MF Frequency Band Acoustic Modem Version 5 0 gt 3 At the command prompt type ATS and then press Enter The S Register settings of the modem are displayed as in the following example Local Registers 500 042 501 001
52. knots of relative speed between two modems communicating over the acoustic link Doppler tracking should be disabled if the two modems are a fixed distance apart or are moving at a constant relative speed while transmitting data Doppler tracking should be enabled if changes in the relative speed between the two modems are expected while transmitting data However with Doppler tracking enabled it is possible to obtain a false Doppler correction in a low signal to noise environment Doppler tracking can be enabled or disabled remotely with the Remote Doppler Tracking command AT Dn m 7 Modem Operating Parameters S Registers 7 6 BENTHOS User s Manual P N 003452 Rev E Acoustic Telemetry Modems 7 7 Packet Retry 52 Default Setting 00 Packet retry is disabled Definition The setting of S Register 2 determines whether packet retry is enabled or disabled When enabled an acknowledgement is required after transmitting each packet of data and the data are retransmitted up to two times if errors are detected or if no acknowledgement is received When disabled data are transmitted only once gt NOTE As each packet of data contains sixteen 256 byte cells for a total of 4 kbytes when packet retry is enabled only the 256 byte cells containing errors are retransmitted Available Settings There are two available settings for S Register 2 as listed below 00 Disables packet retry 01 Enables packet retry S
53. n as determined by the required setting The local modem will enable or disable the display of its AGC output If enabled the local modem will respond with the message AGC test ON If disabled the local modem will respond with the message AGC test OFF P N 003452 Rev E Acoustic Telemetry Modems Release Status Syntax AT Tn Enter Definition 6 75 ATSTn The Release Status command causes the SMART Release at address n to transmit its status The Release Status command can be sent to the release at any time to check its status even after it has been released and the status information is displayed The local modem displays the following status information ARMED RELEASED and CONFIRMED RELEASED and NOT CONFIRMED Tilt Sensor Tilted Tilt Sensor OK Battery Low Battery OK 6 Modem Operating Modes and Commands Displayed when no Release command has been received Displayed when the release mechanism has been activated and the release has released from its mooring Displayed when the release mechanism has been activated but the release has not released from its mooring Displayed when the release is tilted at a angle of greater than 25 from vertical Displayed when the release is not tilted or is tilted at an angle is less than 25 from vertical Displayed when the battery is low and should be replaced Displayed when the battery is notlow and does not need to be repl
54. need to frequently reawaken the modem from its lowpower state 7 Modem Operating Parameters S Registers 7 24 BENTHOS e When a modem is not being powered by batteries as is typically the case for an ATM 891 Deck Box the idle time should be set long or indefinite This improves operating efficiency as the modem never has to be reawakened from its lowpower state User s Manual P N 003452 Rev E Acoustic Telemetry Modems 7 25 RS 232 Driver Flow Control S11 Default Setting 00 There is no handshaking Definition The setting of S Register 11 determines whether the RS 232 driver is turned off or left on when a modem is in the lowpower state Turning off the driver conserves battery power The setting also determines whether hardware RTS CTS handshaking or software XON XOFF handshaking is used for flow control or if no handshaking is used WARNING A setting of 01 will turn off the RS 232 driver whenever the modem is in the lowpower state Therefore hardware RTS CTS handshaking must be disabled at the host processor when sending the first byte of data to the modem over the serial interface After the first byte is sent handshaking can be turned on again or left disabled Available Settings There are three available settings for S Register 11 as listed below 00 Selects no handshaking and turns off the RS 232 driver when the modem is in the lowpower state 01 Selects hardware RTS CTS handshaking and turns off the RS
55. of the boxes checking the items against the packing list to verify that all the items on the list are included Inspect the items for any physical damage that might have occurred during shipment Immediately report any damage to Benthos and to the freight carrier 4 Setup and Test Unpacking and Inspection 4 2 BENTHOS Typical Setup Configurations There are a number of different possible setup configurations for the ATM 880 and ATM 890 Series Acoustic Telemetry Modems However in most cases the modems connect to a host processor through an RS 232 or an RS 422 serial interface The ATM 887 and ATM 887R Acoustic Telemetry Modems provide an RS 232 interface only The host processor can be a PC an embedded processor an instrument or any other device that can act as a data terminal In a typical setup there is always a local modem which connects to a ocal host processor and at least one remote modem which connects to a remote host processor This configuration is only a matter of reference their roles can be reversed Typically however the local modem is the modem to which commands and data are input over the serial interface from the local host processor usually a PC And the remote modem is the modem to which acoustic commands are transmitted and from which data and acknowledgments are received by the local modem over the acoustic link A typical configuration is shown in Figure 4 1 Here the local modem is the ATM 891 Deck Box whi
56. only if S Register 15 is set to 02 entering the Lowpower State command will place the modem into Datalogger mode and into the lowpower state Receiving a Remote Data Logger Enable command AT BEn If the modem receives a Remote Data Logger Enable command from another modem the modem will go into Datalogger mode and S Register 15 will be set to 02 Cycling power S Register 15 is set to 02 If S Register 15 is set to 02 powering down the modem and then powering up the modem will place the modem into Datalogger mode Allowing the idle time to expire S Register 15 is set to 02 If S Register 15 is set to 02 allowing the idle time to expire will place the modem into Datalogger mode and into the lowpower state When the modem is in Datalogger mode data that are input to the modem over the serial interface are stored in an 8 kbyte temporary data buffer After the temporary data buffer has filled the data are immediately transferred to the data logger memory If the temporary data buffer has not filled the modem will wait a preset time called the forwarding delay after the last data are input and then transfer the data The forwarding delay is determined by the setting of S Register 8 The delay settings range from 50 milliseconds to 5 seconds WARNING If the Online Interrupt command is entered to place the modem into Command mode while data remains in the 8 kbyte temporary data buffer the data will not be transferred and th
57. or orientation of the modem s transducers Should environmental or installation conditions change auto configuration should be repeated To auto configure the local and remote modems 1 Choose Configuration gt Auto Configuration The Auto Configuration window opens while TelesonarPC auto configures the modems Auto Configuration Processing the Power Level T T When the modems are configured the Auto Configuration Results window opens Auto Configuration Results IDE XI Modem Auto Configured Local Power level set to Full Remote power level set to Full Uplink acoustic baud rate set to 1200 2 To close the Auto Configuration Results window click OK User s Manual P N 003452 Rev E Acoustic Telemetry Modems 5 31 Operating the Modems after Deployment 5 TelesonarPC TelesonarPC provides a simple user interface for operating the ATM 880 and ATM 890 Series Acoustic Modems including the SMART Releases after they have been deployed The operator functions include going online with different remote modems checking the acoustic link and measuring the range between the local and remote modem s transducers changing the local and a remote modem s transmit power level and acoustic transmit baud rate enabling and disabling a remote modem s data logger and checking downloading and clearing the contents of a remote modem s data logger memory In addition data received from a remote modem can
58. page 6 11 for instructions on how to place the modem into Command mode How to Use To use the Remote Bytes Stored command type AT BN followed by the address of the remote modem and then press Enter The local modem will display the number of bytes of data stored in the remote modem s data logger memory Special Considerations When using the Remote Bytes Stored command take note of the following The local modem must receive an acknowledgment from the remote modem within the acoustic response timeout which is determined by the setting of S Register 7 If an acknowledgment is not received Response Not Received will be displayed While the number of bytes of data stored in the data logger memory of the remote modem is being transmitted the remote modem will not accept any input over the serial interface or over the acoustic link 6 Modem Operating Modes and Commands Entering Commands 6 64 BENTHOS User s Manual P N 003452 Rev E Acoustic Telemetry Modems 6 65 Clear Local Data Logger ATBC Syntax ATBC Enter Definition The Clear Local Data Logger command causes the local modem to clear the contents of its data logger memory NOTE For the local modem to execute entered commands the modem must be in Command mode with the command prompt gt displayed If the modem is not in Command mode refer to page 6 11 for instructions on how to place the modem into Command mode How to Use To use the Cl
59. power connector Cut the wire tie with wire cutters and remove the 10 pin serial cable connector by first pressing down on the locking sleeve tab to unlock it then slide the locking sleeve along the wire harness out of the way grab the cable connector and gently pull to disconnect it Place the end cap assembly on a clean flat surface Remove the modem battery pack by first pushing it out from the POWERY SERIAL connector end cap end and then removing it from the opposite end Inspect the O rings on both end caps They should be free of any scratches nicks or dirt Inspect the O ring surfaces on the housing They should also be free of any scratches nicks or dirt Wipe the O rings clean with an alcohol wipe and apply a light coat of silicone lubricant Replace any O ring that appears cracked or nicked When replacing an O ring first clean the O ring surface on the housing with a clean lint free cloth or paper towel and then apply a thin coat of silicone lubricant to the new O ring before installing it onto the end cap Insert the new modem battery pack into the housing from the transducer end cap end for an ATM 885 Acoustic Telemetry Modem or from the remote transducer connector end cap end for an ATM 885R Acoustic Telemetry Modem and slide the battery pack into the housing about half way P N 003452 Rev E Acoustic Telemetry Modems 8 5 14 15 16 17 18 19 20 Connect the 10 pin serial connector t
60. provided with the Windows operating system or DumbTerm which is available from RDI Instruments The serial port used to connect to the modem must be selected and correctly configured using the terminal program If an instrument is to be used as the host processor refer to the documentation provided with the instrument for the setup information For a convenient user friendly means of configuring and operating the modems without using a terminal program TelesonarPC can be used For instructions on how to install and start TelesonarPC refer to Installing and Starting TelesonarPC on page 5 1 NOTE f TelesonarPC is installed and will be used to operate the modem it is not necessary to set up the PC as instructed below Instead refer to Selecting and Configuring the Local Modem s Serial Communications Port on page 5 15 to select the COM port the baud rate the serial interface and the handshaking to be used by the modem After connecting the modem to the PC as described in Setting Up the Modems on page 4 7 perform the steps listed below to prepare the PC 1 Install the terminal program communications software on the PC 2 Start the terminal program select the serial port that is connected to the modem and configure the port as follows Baud Rate 9600 bits sec Parity None Data Bits 8 Stop Bits 1 4 Setup and Test Setting up the Host Processor 4 16 BENTHOS Checking the Modems and Host Processors Once the mo
61. rate requirements of the military Hence the modems employ two modulation techniques phase shift keying PSK which provides the highest baud rate and multiple frequency shift keying MFSK which provides good reliability in a multipath environment or when the modems are required to operate in a low signal to noise SNR environment This section provides an overview of the ATM 880 and ATM 890 Series Acoustic Telemetry Modems reviews a few of their many applications and describes the high performance modulation techniques that are used 1 Overview 1 2 BENTHOS NOTE The ATM 880 and ATM 890 Series Acoustic Telemetry Modems are not compatible with the older ATM 870 Series Modem and Transducer Configurations The ATM 880 and ATM 890 Series Acoustic Telemetry Modems are organized into four main configuration groups one group comprises the surface modems another the subsea modems a third the SMART Releases and a fourth the remote transducers which are used by both the surface and subsea modems The surface modems consist of two modem configurations a deck box and a modem module The subsea modems include modems with either built in transducers or provisions for the use of any of the remote transducers The SMART Releases include modem electronics a built in transducer and a release mechanism The remote transducers include two different types each with unique beam patterns and available frequencies and each with a
62. receives the Dial command ATD When the Device Enable output is on it will switch up to 80 mA to ground When it is off itis a high impedance Refer to Section 2 Specifications for additional electrical specifications Transmit Data Buffers Each modem includes four internal 4 kbyte transmit data buffers for a total buffer size of 16 kbytes This allows data that are input to the modem over the serial interface to be organized into four packets of 4 kbytes After a transmit 6 Modem Operating Modes and Commands Operating Modes 6 4 User s Manual BENTHOS data buffer has filled the modem immediately transmits the data If data are input to the modem but the transmit data buffer does not fill the modem will wait a preset time called the forwarding delay after the last data are input and then transmit the partial packet The forwarding delay is determined by the setting of S Register 8 and ranges from 50 milliseconds to 5 seconds WARNING If the Online Interrupt command is entered to place the modem into Command mode while data remains in the 4 kbyte transmit data buffer the data will not be transmitted and the buffer will be cleared Refer to Online Interrupt on page 6 15 for information on the Online Interrupt command The 4 kbyte transmit data buffers also allow a faster serial interface baud rate than the acoustic baud rate For example the serial interface baud rate can be 9600 bits sec while
63. should be set to 00 This will avoid errors that might occur should the instrument be unable to recognize the diagnostic messages or received data statistics User s Manual P N 003452 Rev E Acoustic Telemetry Modems 7 31 Remote Address 14 Default Setting 00 The address of the remote modem that the local modem is online with is 00 Definition The setting of S Register 14 is the address of the remote modem that the local modem is online with when the local modem is powered up or awakened from the lowpower state This occurs only if S Register 15 is set to 01 Available Settings The range of settings for S Register 14 is from 00 to 99 This provides a total of 100 addresses Special Considerations When setting S Register 14 take note of the following The Dial command ATDn sets S Register 14 of the remote modem to the address of the local modem The Dial command ATDn sets S Register 14 of the local modem to the address of the remote modem 7 Modem Operating Parameters S Registers 7 32 BENTHOS User s Manual P N 003452 Rev E Acoustic Telemetry Modems 7 33 Operating Mode 15 Default Setting 01 When the modem is powered up or awakened from the lowpower state the modem will go into Online mode Definition The setting of S Register 15 determines the operating mode that a modem will go into when it is powered up or when the modem is awakened from the lowpower state Available Settings The ra
64. that it transmits and receives signals equally well in a wide hemispherical pattern This transducer should be selected when the horizontal direction or the depth of the receiving modem is not known or is not always the same However more power is required compared to a directional transducer to produce an equivalent source level and the effects of multipath are usually greater The AT 421 Directional Transducer and its beam pattern are shown in Figure 1 7 on page 1 10 Whenever possible this transducer should be selected Its transmit and receive beam patterns are that of a narrow cone hence it is a good choice when the depth and direction of the receiving modem is known and is stable and the transducer can be pointed at the receiving modem This transducer requires the least amount of power to produce the equivalent source level of an omnidirectional transducer and it provides the best protection against the effects of multipath 3 Deployment Considerations Remote Transducer Selection 3 2 BENTHOS Modem Battery Pack For the subsea modems that use a modem battery pack the capacity of the battery pack determines both the amount of data a modem can transmit and the modem s useful deployment life Battery Pack Currents In the lowpower state where the modem is switched on but is inactive a very small amount of current is drawn from the modem battery pack typically from 0 5 mA to a maximum of 1 0 mA Therefore the modem battery p
65. the Data Logger Memory of the Remote Modem To check the data logger memory of the online remote modem 1 Choose Datalogger gt Check Remote Buffer The local modem commands the remote modem to transmit the number of bytes stored in its data logger memory and the Remote Datalogger window opens with the number of bytes displayed Remote Datalogger lt 3 There are 5053 bytes in datalogger buffer of remote modem 5 TelesonarPC Operating the Modems after Deployment 5 36 User s Manual BENTHOS The relative amount of data stored in the remote modem s data logger memory is also displayed in the Remote Datalogger Status display in the Main window 2 To close the Remote Datalogger window click OK Downloading the Contents of the Remote Modem s Data Logger Memory to a File The contents of the remote modem s data logger memory can be downloaded directly to a file on the PC To download the contents of the remote modem s data logger memory to a 1 Choose Datalogger gt Download Remote Buffer The Datalogger Download Time window opens Datalogger Download Time x There are 4096 Bytes Stored Downloading the datalogger will take 0 Hours 1 Minutes Do you wish to continue Cancel If applicable verify that the remote modem s battery pack capacity is adequate for transmitting the amount of data displayed in the Datalogger Download Time window Refer to Battery Pack Capacity Usage
66. the acoustic baud rate is 600 bits sec However when the serial interface baud rate is faster than the acoustic baud rate no more than 16 kbytes of data can be input to the modem without loss of data unless handshaking is used WARNING If handshaking is not used and data are input to the modem when all four of the 4 kbyte transmit data buffers are full the data will be ignored hence lost Although the use of handshaking which uses the RS 232 signal RTS is optional it is highly recommended when more than 16 kbytes of data are to be transmitted and packet retry as determined by the setting of S Register 2 is disabled 12 kbytes if enabled Refer to Packet Retry S2 on page 7 7 for information on S Register 2 Handshaking will ensure there is no loss of data as when the four 4 kbyte transmit data buffers are full handshaking will not allow the host processor to output data to the modem NOTE While data are being transmitted from a 4 kbyte transmit data buffer data can continue to be input to the modem over the serial interface filling the additional 4 kbyte transmit data buffers Refer to Setting Up the Modems on page 4 7 for information on how to set up the modems The recommended setup uses the RS 232 handshaking signal RTS when connecting the modems P N 003452 Rev E Acoustic Telemetry Modems 6 5 Data Format Data including parity that are input to the modem over the serial interface when the modem is in Online mode
67. the number of bytes that can be transmitted assuming for now that the lowpower state current can be neglected From the equation Amp hours D x A R x 450 D becomes D amp hours x 450 1 A 13 5 A h 600 bits sec x 450 1 A 3 645 000 bytes To account for the processing overhead when transmitting a packet of data where in this case a single packet is 500 bytes an additional 2 bytes of data per packet must be added along with 1 2 seconds of transmitter active time However to simplify the calculations the 1 2 seconds can be converted into equivalent bytes using the 600 bits second baud rate and the 8 bits byte conversion P N 003452 Rev E Acoustic Telemetry Modems 3 5 Equivalent bytes 1 2 sec x 600 bits sec 8 bits byte 90 bytes Now the total bytes to be transmitted per packet is 500 2 90 592 bytes packet Hence the total number of packets that can be transmitted is Total number of packets 3 645 000 bytes 592 bytes packet 6 157 packets And since 1 packet of data transmitted every 30 minutes is equivalent to 48 packets transmitted per day the total number of deployment days is Total deployment days 6 157 packets 48 packets day 128 3 days However for long deployments the lowpower state current must be considered Therefore the modem battery pack capacity required for the lowpower state is Lowpower state amp hours deployment time in hours 500 uA 128 3 days 24 hours
68. the operating frequency band the beam pattern of the transducers the multipath and ambient noise conditions and other factors In general horizontal ranges of two to three kilometers are typical with omnidirectional transducers and can be extended with the use of directional transducers When the installation and environmental conditions are known the approximate expected range can be estimated Multipath and Noise User s Manual Because of the advanced modulation schemes used by the ATM 880 and ATM 890 Series Acoustic Telemetry Modems reliable operation can be obtained even in relatively severe multipath and noise conditions but usually at the expense of a reduced baud rate Refer to High Performance Modulation Techniques on page 1 16 for an explanation of the modulation schemes However paying particular attention to the modems remote transducer orientations their height above the bottom or their depth below the surface can reduce the effects of multipath and ambient noise In some instances the use of acoustic baffles can further improve performance In addition the operating frequencies of other acoustic equipment in the area are an important consideration when attempting to achieve optimum performance from the modems P N 003452 Rev E Acoustic Telemetry Modems 3 7 Transducer Orientation If possible when using the AT 421 Directional Transducer orient the transducer such that it is pointing toward the receiving modem
69. to verify that its transmitter is functioning In addition the local modem s firmware version number can be checked Checking the Battery Pack Voltages To check the local modem s battery pack or power supply voltage choose Diagnostic gt Local Battery Check The voltage of the local modem s battery pack or power supply is displayed in the Battery Voltage Status display If the voltage is too low a Warning window also opens with the voltage displayed To check the battery pack voltage of the online remote modem choose Diagnostic gt Remote Battery Check The voltage of the remote modem s battery pack is displayed in the Battery Voltage Status display If the voltage is too low a Warning window also opens with the voltage displayed P N 003452 Rev E Acoustic Telemetry Modems 5 45 5 TelesonarPC Viewing the Background Noise Level of the Local Modem The relative background noise level detected by the local modem s receiver can be viewed in real time in continuous one second intervals However when the noise test is being performed data transmitted by a remote modem will be indicated as noise in the display and the data will not be received or displayed by TelesonarPC To view the background noise level 1 Choose Diagnostic gt Noise Test The Noise Test window shown in Figure 5 17 opens Noise Test Noise Level Level Very Noisy Noisy No Signal Figure 5 17 The Noise Test Window The n
70. transmit at frequencies within or near the operating frequency of the modems modem performance will likely be reduced The installation and use of other equipment near a modem should be carefully considered prior to and after installing and deploying a modem 3 Deployment Considerations Multipath and Noise 3 8 BENTHOS Typical Deployment Configurations The deployment configurations for the ATM 880 and ATM 890 Series Acoustic Telemetry Modems should take into account the required modem operating depth and communications range and the multipath and noise factors As there are many possible deployment configurations that will take these factors into account especially for the subsea modems typical deployment configurations are presented only In addition refer to Section 4 Setup and Test for information on the cables and connectors used to connect the modems The modems should be set up and tested prior to deployment Each subsea modem is encased within an anodized aluminum housing Each remote transducer is encapsulated in a protective urethane mold and mounted to an anodized aluminum housing which contains a built in preamplifier and transmitter These configurations provide a high degree of protection from physical damage However for all installation configurations any installed cables that provide external power to the modem or connect to a remote transducer should be properly secured to prevent crimping or accidental disconnecti
71. treated as data which are freely exchanged between the local and 6 Modem Operating Modes and Commands Operating Modes 6 2 User s Manual BENTHOS remote host processors In Command mode the input is treated as commands which instruct the modem to perform various functions including sending commands to remote modems In Datalogger mode the input is also treated as data but in this case the data are stored in the flash memory of the modem s data logger At any time these data can be transmitted acoustically to another modem When a modem is powered up it immediately goes into one of the three operating modes as determined by the setting of S Register 15 00 for Command mode 01 for Online mode or 02 for Datalogger mode However after powering up it is possible to change the operating mode regardless of the setting of S Register 15 Online Mode When a modem is in Online mode and is online with a remote modem input from its host processor over the serial interface is treated as data which are freely exchanged between the local and remote host processors A modem will go into Online mode when it is powered up only if S Register 15 is set to 01 which is the factory default setting In this case any input to the modem over the serial interface is transmitted to the remote modem whose address is the setting of S Register 14 Therefore setting S Register 15 to 01 allows the modem to go online automatically with any remote modem whose
72. voltages are being measured the DSP receiver power supply is under load and the transmitter power supply is open circuited gt NOTE Refer to Table 8 1 on page 8 3 for the estimated modem battery pack capacity remaining verses the voltage of the transmitter power supply 6 Modem Operating Modes and Commands Entering Commands 6 50 BENTHOS User s Manual P N 003452 Rev E Acoustic Telemetry Modems 6 51 Remote Battery Voltage AT Vn Syntax AT Vn Enter Definition The Remote Battery Voltage command causes the local modem to display the DSP receiver and transmitter power supply voltages of the remote modem at address n Both supply voltages are supplied from the modem battery pack NOTE For the local modem to execute entered commands the modem must be in Command mode with the command prompt gt displayed If the modem is not in Command mode refer to page 6 11 for instructions on how to place the modem into Command mode How to Use To use the Remote Battery Voltage command type AT V followed by the address of the remote modem and then press Enter The local modem will display the DSP receiver and transmitter power supply voltages of the remote modem Special Considerations When using the Remote Battery Voltage command take note of the following The local modem must receive an acknowledgment from the remote modem within the acoustic response timeout which is determined by the setting of S
73. where a negative number indicates the modems are moving farther apart and a positive number indicates the modems are moving closer together AGC Automatic Gain Control a decimal number where the lower the number the less gain which means a strong input 6 Modem Operating Modes and Commands Entering Commands 6 30 User s Manual BENTHOS signal was received Similarly the higher the number the more gain which means a weak input signal was received The lowest gain indication is 00 and the highest is 95 CCERR Corrected Channel Error Metric 0 14 NOTE For the local modem to execute entered commands the modem must be in Command mode with the command prompt gt displayed If the modem is not in Command mode refer to page 6 11 for instructions on how to place the modem into Command mode How to Use To use the Multiple Baud Rate Test command type ATY followed by the address of the remote modem and then press Enter The remote modem will transmit the 256 byte preset test message at each of the different baud rates and the local modem will display the received data statistics described above In addition depending on the setting of S Register 12 the local modem will display the preset test message which consists of the alphanumeric ASCII character set Special Considerations When using the Multiple Baud Rate Test command take note of the following The local modem must receive an acknowledgment from the r
74. will be online with the remote modem whose address is the setting of S Register 14 Cycling power S Register 15 set to 01 If S Register 15 is set to 01 powering down the modem and then powering up the modem will place the modem into Online mode and the modem will be online with the remote modem whose address is the setting of S Register 14 Receiving a Dial command ATDn from a remote modem If the modem receives a Dial command from a remote modem the modem will go into Online mode and go online with the remote modem Receiving a Remote Data Logger Disable command AT BDn when it is in Datalogger mode If the modem receives a Remote Data Logger Disable command from another modem and it is in Datalogger mode the modem will go into Online mode and S Register 15 will be set to 01 Device Enable Device Enable is an output provided by all the modems except the ATM 891 Deck Box Refer to Setting Up the Modems on page 4 7 for connection information Device Enable can be used to switch on a modem s host processor when the modem is ready to send data to it that were received over the acoustic link and to switch off the host processor when the modem is in the lowpower state such as when it receives the Hangup command ATH the Lowpower State command ATL or the idle time expires If the Device Enable output is off it will turn on only if the modem receives data over the acoustic link 80 ms prior to sending the data to the host or if it
75. will surface a safe distance from the vessel WARNING The range is the slant or direct distance from the local modem s transducer to the remote modem s transducer not the horizontal distance To auto range with the remote modem 1 Choose Acoustic Communication gt Auto Range The Automatic Ranger Window opens Automatic Ranger Operating the Modems after Deployment 5 34 User s Manual BENTHOS 2 Click Start in the Automatic Ranger window TelesonarPC begins acquiring and displaying the range to the remote modem in the Automatic Ranger window The display is updated approximately every five seconds 3 To end auto ranging click Halt Auto ranging stops and an end of auto ranging indication is displayed c Automatic Ranger Begin Auto Ranging Current Time Range 18 45 26 61 0 m 18 45 31 61 0 m 18 45 37 61 0 m 18 45 43 61 0 m 18 45 49 61 0 m 18 45 54 61 0 m 18 46 00 61 0 m 18 46 06 51 0 m 18 46 11 61 0 m End Auto Ranging 4 To close the Automatic Ranger window click Close Changing the Transmit Power Levels of the Local and Remote Modems To change the transmit power level of the local modem click the up or down arrow in the drop down list box in the Local Power Level Status display in the Main window until the desired setting is displayed When changed the display turns blue Then click SET When the new power level is set the display turns back to black
76. 0 and ATM 890 Series Acoustic Telemetry Modems is the acquisition of real time or stored data from deployed instruments In this application a subsea modem is deployed with an instrument package such as a current meter a Conductivity Temperature Depth CTD instrument or a tide gauge The modem receives data from the instrument over its RS 232 422 serial interface and either immediately transmits the data to a receiving modem or stores the data for transmission later One example of this application is shown in Figure 1 8 RF LINK TO REMOTE STATION ATM 880 MODULE inside buoy ee E PM AT 408 OMNIDIRECTIONAL TRANSDUCER ATM 885 INSTRUMENT 74 PACKAGE MODEM Figure 1 8 Data Acquisition and RF Link to Remote Station 1 Overview Typical Applications 1 12 User s Manual BENTHOS where several ATM 885 Acoustic Telemetry Modems each of which include a built in omnidirectional transducer are deployed with an instrument package All the modems communicate with an ATM 880 Module installed on a surface buoy The module connects to an onboard host processor and an AT 408 Omnidirectional Transducer which is configured as a dunking transducer Data that are received from the instrument packages are transmitted to a remote station receiver by way of an RF link such as a cellular phone or a satellite connection Use of modems in this application eliminates the need to install ex
77. 1 for instructions on how to place the modem into Command mode How to Use To use the Write command type AT amp W and then press Enter The local modem will save its current S Register settings as the startup configuration and then respond with the message Sregisters Stored WARNING If power is lost while the Write command is being executed all the S Register settings will revert to their factory default settings upon power up Special Considerations When using the Write command take note of the following To display the message Sregisters Stored and many other messages S Register 13 must be set to either 01 or 02 where 01 is the factory default setting When the modem is powered up the S Registers will be set to their new startup configuration The S Register settings can again be changed with the Set Register command ATSnzn and then saved as the new startup configuration with the Write command 6 Modem Operating Modes and Commands Entering Commands 6 42 BENTHOS User s Manual P N 003452 Rev E Acoustic Telemetry Modems 6 43 Lowpower State ATL Syntax ATL Enter Definition The Lowpower State command forces the idle time of the local modem to expire which in turn causes the modem to go into the lowpower state gt NOTE For the local modem to execute entered commands the modem must be in Command mode with the command prompt gt displayed Ifthe modem is not in Command mode refer
78. 1 m 3 28 ft P N 003452 Rev E Acoustic Telemetry Modems 2 7 ATM 887R Subsea Modem The ATM 887R Acoustic Telemetry Modem is a 6000 meter depth rated subsea modem that includes an internal modem battery pack and connects to an AT 421 Directional Transducer with a supplied 2 meter cable The modem can operate either on its internal battery pack or on external DC 2 Specifications power Physical Characteristics Housing construction Dimensions Mounting Weight in air Weight in water Operating depth Hard coat anodized and painted aluminum 12 7 cm 5 0 in max diameter by 71 9 cm 28 3 in long Stainless steel sidebar 16 4 kg 36 Ib 7 7 kg 17 Ib 6000 m 19 680 ft Power Requirements Modem battery pack External DC input power Lowpower state current DSP receiver current active Transmitter current active Input Output Operator controls Power Signal 21V 28A h 14 28 V 0 5 MA typical 1 0 mA maximum 29 MA typical 1 A average 3 A peak 21 V MF HF 2 A average 5 A peak 21 V LF Plunger type on off switch DC power input RS 232 serial interface data Transducer AT 421 ATM 887R Subsea Modem 2 8 Device enable Transducers Available types BENTHOS Active low open collector output Maximum sink current is 80 mA Maximum applied voltage is 40 VDC AT 421 directional LF and MF ATM 888 Subsea Modem The ATM 888 Acoustic Telemetry Modem is
79. 22 4 ys 6 45 Remote Doppler Tracking AT Dn m 6 47 Local Battery Voltage ATV prr 6 49 Remote Battery Voltage AT SVN uso gt linia 6 51 Remote Data Logger Enable 6 53 Remote Data Logger Disable AT BDn 6 55 Read Remote Data Logger 6 57 Output Data Logger Block AT BBn m 6 59 Clear Remote Data Logger AT BCn 6 61 Remote Bytes Stored AT BNn 6 63 Clear Local Data Logger ATBC 6 65 Local Bytes Stored 6 67 Output Local Data Logger sis 6 69 Output Local Page ATBPh 6 71 AGC Diagnostic ATTNN 6 73 Release Status 6 75 Release us suse aa a n AT Rn m 6 77 7 Modem Operating Parameters S Registers 7 1 Software Version Number SD uus vrais 7 3 Doppler Tracking Sd rear 7 5 Packet Retry lp DP TP TT 7 7 Serial Baud Rate Sd ovi acd id a os ETE 7 9 Acoustic Baud Rate S Lassus eT ES 7 11 Reserved silos uu aetu RE SO tatu aa x cw de 7 13 Transmit Power Level SO sara een 7 15 Acoustic Response Timeout cy ARMOR ar o t
80. 232 driver when the modem is in the lowpower state Therefore when the modem is in the lowpower state there is no handshaking 02 Selects hardware RTS CTS handshaking and leaves the RS 232 driver turned on when the modem is in the lowpower state However the modem draws an additional 2 mA of current which shortens the modem battery pack life 03 Selects software XON XOFF handshaking and turns off the RS 232 driver when the modem is in the lowpower state 7 Modem Operating Parameters S Registers 7 26 BENTHOS User s Manual P N 003452 Rev E Acoustic Telemetry Modems 7 27 ATX Test Message Length 12 Default Setting 00 When the local modem transmits the Acoustic Link Test command ATXn to a remote modem the remote modem will transmit an 8 byte preset test message and when the message is received by the local modem it will not be displayed Definition The setting of S Register 12 determines which of 8 preset test messages a remote modem will be commanded to transmit when it receives the Acoustic Link Test command ATXn from the local modem The setting also determines whether the preset message when received by the local modem is displayed Available Settings There are 16 available settings for S Register 12 as listed below 00 01 02 03 04 05 06 07 8 byte message no display 128 32 byte message no display 129 128 byte message no display 130 256 byte message no display
81. 4 Power Requirements 2 5 Input Outp t cr a a ac 2 5 Transdu cers ne ee ees 2 5 ATM 887 Subsea Modem 2 5 Physical Characteristics 2 6 Power Requirements 2 6 Input Output au zu ea 2 6 TratisduCBI S sia ung br i an OB TUR ee tee 2 6 ATM 887R Subsea Modem 2 7 Physical Characteristics 2 7 Power Requirements 2 7 Inp t Output sr ar 2 7 Transducers 2s us area eae 2 8 ATM 888 Subsea Modem 2 8 Physical Characteristics u sew Re dae dee eens 2 8 Power Requirements 2 8 Iniput OUtDUL AB nt By i Ma Bea Dhar 2 9 Transducers ccs Secum uer OE uu uere ce M I EQ 2 9 User s Manual P N 003452 Rev E Acoustic Telemetry Modems ix ATM 885PCB Modem Board Set 2 9 Physical Characteristics 2 9 Power Requirements 2 9 Input Output iios zo eu ru RE bee as 2 10 Transducers 2 Hr acr er d Ree 2 10 ATM 885RPCB Modem Board Set 2 10 Physical Characteristics 2 10 Power Requirements
82. 500 m s Figure 5 7 The Range Options Dialog Box 2 In the Range Units area of the Range Options dialog box select the units of range 3 Select the speed of sound in meters sec in the Speed of Sound area 4 Click Set to save the new settings and close the Range Options dialog box Configuring the Local and Remote Modems 5 18 BENTHOS Selecting Units of Relative Speed TelesonarPC calculates and displays the relative speed between the local and remote modem s transducers in units of knots or kilometers hour The relative speed is displayed in the Relative Speed Status display in the Main window and the units of relative speed can be selected To select the units of relative speed 1 Choose Configuration gt Speed Units The Relative Speed Units dialog box shown in Figure 5 8 opens Relative Speed Units Units of Measure Nautical Miles HR Knots C Kilometers HR Figure 5 8 The Relative Speed Units Dialog Box 2 In the Units of Measure area of the Relative Speed Units dialog box select the units of relative speed 3 Click Set to save the new settings and close the Relative Speed Units dialog box Configuring the Local Modem s Operating Parameters S Registers To configure the local modem s operating parameters 1 Connect the local modem to the PC turn it on and start TelesonarPC 2 Choose Configuration gt Local Modem The Local Modem Configuration dialog box shown in Fi
83. 7 is from 07 to 140 where each increment represents 0 5 seconds for a time range of 3 5 to 70 0 seconds Special Considerations The acoustic response timeout should be increased as the range between a local and remote modem increases As sound travels at about 1500 meters sec in seawater the total time for the sound to travel a two way distance of 6000 meters for example is about 4 seconds The time it takes for a modem to receive and respond to a command must also be considered This time however will always be approximately 1 75 seconds Therefore the default setting of 15 for 7 5 seconds is sufficient for modem ranges equal to or less than 3000 meters which is equivalent to a two way distance of 6000 meters 7 Modem Operating Parameters S Registers 7 18 BENTHOS User s Manual P N 003452 Rev E Acoustic Telemetry Modems 7 19 Forwarding Delay 58 Default Setting 60 The modem will transmit the data in one of its four 4 kbyte transmit data buffers or transfer the data in its 8 kbyte temporary data buffer to the data logger memory when the corresponding buffer is full or 3 seconds after the last data are input whichever occurs first Definition The setting of S Register 8 determines the forwarding delay of a modem When a local modem is online with a remote modem the local modem accumulates data in its four 4 kbyte transmit data buffers These data are input from its host processor over the serial interface Immedi
84. A warning message is displayed only when the condition requiring the warning is detected The warnings are shown in separate windows which can be closed by clicking OK to acknowledge the warning In addition the display of some of the warning messages can be enabled or disabled To enable the display of all warning messages choose Diagnostic gt Warning Messages gt Enable To disable choose Disable Updating the Status Displays for the Remote Modem To update the Status displays for the online remote modem choose Acoustic Communication gt Get Remote Status P N 003452 Rev E Acoustic Telemetry Modems 5 11 Battery Pack Capacity Usage and Deployment Length Calculations 5 TelesonarPC TelesonarPC provides a convenient tool for calculating the required modem battery pack capacity usage based on the length of deployment and the amount of data to be transmitted Two basis are provided one calculates the required capacity for a short deployment where a single relatively large data file is to be transmitted the other the required capacity for a long deployment where relatively small data files are to be transmitted periodically Both basis take into account the expected ambient temperature In addition and for both basis TelesonarPC can calculate the maximum deployment length based on the total amount of data to be transmitted Transmitting a Relatively Large Data File Short Deployment Transmitting a relatively large data
85. AT 421 AT 408 omnidirectional LF MF and HF AT 421 directional LF and MF ATM 885 Subsea Modem The ATM 885 Acoustic Telemetry Modem is a completely self contained subsea modem with a built in omnidirectional or directional transducer and an internal modem battery pack The modem can operate either on its internal battery pack or on external DC power 2 Specifications Physical Characteristics Housing construction Dimensions Mounting Weight in air Weight in water Operating depth Hard coat anodized aluminum 14 0 cm 5 5 in max diameter by 85 1 cm 33 5 in long Stainless steel sidebar 11 kg 24 Ib 5 kg 11 Ib 2000 m 6560 ft Power Requirements Modem battery pack External DC input power Lowpower state current DSP receiver current active Transmitter current active 21 V 18 A h 14 28 V 0 5 mA typical 1 0 mA maximum 25 mA typical 1 A average 3 A peak 21 V MF HF 2 A average 5 A peak 21 V LF ATM 885 Subsea Modem 2 4 Input Output Operator controls Power Signal Device enable Transducers Type Source level 21 V typ Source level 14 V typ BENTHOS Plunger type on off switch External DC power input RS 232 422 serial interface data Active low open collector output Maximum sink current is 80 mA Maximum applied voltage is 40 VDC Built in LF MF or HF omnidirectional or MF directional 178 dB re 1 uPa 1 m 3 28 ft for
86. Acoustic Telemetry Modems User s Manual P N 003452 Rev E BENTHOS Benthos Inc 49 Edgerton Drive North Falmouth MA 02556 U S A Tel 508 563 1000 Fax 508 563 6444 www benthos com BENTHOS Notices User s Manual Proprietary Information The information descriptions photos and illustrations in this manual are the property of Benthos Inc Materials may not be reproduced or disseminated without the prior written consent of Benthos Warranty LIMITED WARRANTY Benthos warrants that the products sold hereunder shall be free from defects in materials and workmanship under normal use and service when correctly installed used and maintained for a period of 12 months from date of shipment from Benthos Purchaser s receipt of any product delivered hereunder shall be an unqualified acceptance of and a waiver by Purchaser of the right of Purchaser to make a claim with respect to such product unless Purchaser gives Benthos notice of any claim within 12 months after the receipt of such product This warranty is limited to repair or replacement of the said product at Benthos option F O B the Benthos plant in North Falmouth Massachusetts providing the product was not abused or operated other than in accordance with the Benthos instruction manuals Since all Benthos oceanographic instruments are pressure tested to rated depth prior to shipment Benthos does not assume responsibility for any damage due to leakag
87. Acoustic Telemetry Modems They differ only in their size and amp hour capacity Both packs use alkaline batteries Modem Battery Pack for ATM 885 885R Acoustic Telemetry Modems Capacity 18 Ah 21 C Open circuit voltage 21V Modem Battery Pack for ATM 887 887R Acoustic Telemetry Modems Capacity 28 Ah 21 C Open circuit voltage 21V Modem Battery Packs Acoustic Telemetry Modems 3 1 3 Deployment Considerations A number of factors must be considered before deploying an ATM 880 or ATM 890 Series Acoustic Telemetry Modem These include the choice of a remote transducer the required operating depth the required communications range the multipath and noise conditions and the physical protection of the modems This section reviews these factors and also presents some typical installation configurations for the modems Remote Transducer Selection When an ATM 885R an ATM 887R or an ATM 885RPCB Acoustic Telemetry Modem each of which use a remote transducer is to be installed the type of remote transducer to use should be carefully selected to best suit the application Refer to Remote Transducers on page 1 8 for general information on the available remote transducers and to Section 2 Specifications for detailed specifications Also refer to Section 9 Drawings for dimensioned outline drawings The AT 408 Omnidirectional Transducer and its beam pattern are shown in Figure 1 6 on page 1 9 Its beam pattern shows
88. B 10 25 02 amp N 9 345 KS IRos 1 2090900 t Benthos FOR MANUAL PA OEM BOARD SET N DRAWING NUMBER o inan DRAWN BY 12 05 01 ANj8896 UPDATE DRAWING GC JC 805 BEE om CHECKED PP 01 05 01 A 8281 senos SC PP RDS 8010 eproven RDS 03909 REV ECO DESCRIPTION DR CHK APPR V mateo es PONE FEE 875055595 260 6 2 6 98 U SOHLN38 SBUIMEJG 6 DSP PC BOARD 2X 19 DRILL THRU 41 42 FILTER SUPPLY PCB J3 TERENE PC BOARD FILTER SUPPLY PCB CONNECTIONS J1 REMOTE TRANSDUCER J2 SIGNAL OUT TO DSP J3 BATTERY OR EXTERNAL POWER J4 ON OFF SWITCH CUSTOMER SUPPLIED J5 POWER OUT TO OTHER BOARDS J7 REMOTE TRANSDUCER CONNECTION MFSK DSP PCB CONNECTIONS J6 N C J4 SERIAL INTERFACE J4 POWER FROM FILTER SUPPLY PCB J10 RECEIVE INPUT FROM FILTER INTERFACE PCB CONNECTIONS ZEN o bers wr CONFIDENTIAL BENTHOS ML geben Cc a Limes du Seem mee cot OUTLINE ATM 885R Dre m BY PCB OEM BOARD SET aem eese rose Gc em mnm E BE B875 08693 01 06 01 8281 semis Formar CC PP Rosh R 010 _ DESCRIPTION DR CHKJAPPR V on ma PANS PIE NAME BA 7 SOB693B DWG 3 2 98 5 NTS swopow 391WU9
89. Checking the Acoustic Link between Two Modems in Air EG edens ae eee eee eth 4 19 5 TelesonarPC 5 1 Installing and Starting TelesonarPC 5 1 Installing TelesonarPC 5 1 Starting TelesonarPC 5 2 Checking the TelesonarPC Version Number 5 4 Exiting TelesonarPG 5 4 Uninstalling TelesonarPC 5 5 The Main Window 5 5 Menu Bal oun Ri ERR SR Roi CR Ro Ova 5 6 Status Bat aaa s d RE RENE Da a eoe va E Ed RO e 5 7 Status Displays eniten 4 Wha ERR Se o Ree ee Ra aeree 5 8 Data DisplayS nr cS es beak ae eee Sa Oe beue 5 10 Displaying Warning Messages 5 10 Updating the Status Displays for the Remote Modem 5 10 User s Manual P N 003452 Rev E Acoustic Telemetry Modems xi Battery Pack Capacity Usage and Deployment Length Calculations 5 11 Transmitting a Relatively Large Data File Short Deployment 5 11 Transmitting Relatively Small Data Files Periodically Long Deployment 5 13 Configuring the Local and Remote Modems 5 15 Selecting and Configuring the Local Modem s Serial Communications Port 5 15 Selecting
90. Disable command take note of the following To display the message OK and many other messages S Register 13 must be set to either 01 or 02 where 01 is the factory default setting The local modem must receive an acknowledgment from the remote modem within the acoustic response timeout which is determined by the setting of S Register 7 If an acknowledgment is not received Response Not Received will be displayed The Remote Data Logger Disable command sets S Register 15 of the remote modem to 01 The Remote Data Logger Disable command has no effect on the remote modem if the remote modem is not in Datalogger mode 6 Modem Operating Modes and Commands Entering Commands 6 56 BENTHOS User s Manual P N 003452 Rev E Acoustic Telemetry Modems 6 57 Read Remote Data Logger ATSBTn Syntax AT BTn Enter Definition The Read Remote Data Logger command causes the local modem to display the contents of the data logger memory of the remote modem at address n NOTE For the local modem to execute entered commands the modem must be in Command mode with the command prompt gt displayed If the modem is not in Command mode refer to page 6 11 for instructions on how to place the modem into Command mode How to Use To use the Read Remote Data Logger command type AT BT followed by the address of the remote modem and then press Enter The local modem will display the contents of the remote modem s data logger
91. F MF and HF AT 421 directional LF and MF ATM 887 Subsea Modem The ATM 887 Acoustic Telemetry Modem is a completely self contained 6000 meter depth rated subsea modem with a built in medium frequency MF directional transducer and an internal modem battery pack The modem can operate either on its internal battery pack or on external DC power 2 Specifications ATM 887 Subsea Modem 2 6 User s Manual BENTHOS Physical Characteristics Housing construction Dimensions Mounting Weight in air Weight in water Operating depth Hard coat anodized and painted aluminum 12 7 cm 5 0 in max diameter by 85 3 cm 33 6 in long Stainless steel sidebar 16 4 kg 36 Ib 7 7 kg 17 Ib 6000 m 19 680 ft Power Requirements Modem battery pack External DC input power Lowpower state current DSP receiver current active Transmitter current active Input Output Operator controls Power Signal Device enable Transducers Type Source level 21 V typ Source level 14 V typ 21V 28 A h 14 28 V 0 5 mA typical 1 0 mA maximum 25 mA typical 1 A average 3 A peak 21 V MF HF 2 A average 5 A peak 21 V LF Plunger type on off switch External DC power input RS 232 serial interface data Active low open collector output Maximum sink current is 80 mA Maximum applied voltage is 40 VDC Built in MF directional 190 dB re 1 uPa 1 m 3 28 ft 187 dB re 1 uPa
92. ICS CONNECTOR FOR CONNECTION TO REMOTE TRANSDUCER USE BENTHOS CABLE ASSY P N 007810 R USES BENTHOS TOLERANCES ben as noreo CONFIDENTIAL BENTHOS m 015 This document ond the information 49 Edgerton Drive XX 010 contained therein is proprietary ond North Falmouth MA 02556 U S A 005 contidentiol to Benthos Inc and moy not be used reproduced or disclosed FRACTIONAL 1 64 Hole Size ithout the it t lei p OUTLINE ATM 887R ener RES 75 p Tora or _ 01 09 01 AN 8281 BENTHOS FORMAT ROS csse CHECKED By pm mare REVISION 7 9 98 VAN cosnecreo we SN 5 B877 08723 B ome svo mol _oescrrmon or one APPR V cma ua B87087238 0N 472 78 I NTS E EJ LN ane ess row name c 9 6 SOHLN38 SBUIMEJG 6 DSP PC BOARD 2X 19 DRILL THRU pi Son J4 J3 FILTER SUPPLY PCB TRANSMITTER PC BOARD THIS SURFACE MUST BE MOUNTED TRANSMITTER PCB CONNECTIONS FILTER SUPPLY PCB CONNECTIONS TO THERMALLY CONDUCTIVE SURFACE FOR PROPER HEAT SINKING J2 TRANSDUCER CONNECTION SIGNAL OUT TO DSP BATTERY OR EXTERNAL POWER J3 PREAMP OUTPUT TO FILTER J4 POWER INPUT FROM FILTER ON OFF SWITCH CUSTOMER SUPPLIED POWER OUT TO OTHER BOARDS DSP PCB CONNECTIONS SERIAL INTERFACE
93. MF and HF omnidirectional 185 dB re 1 uPa 1 m 3 28 ft for LF omnidirectional 190 dB re 1 uPa 1 m 3 28 ft for LF and MF directional 3 dB down from source level at 21 V ATM 885R Subsea Modem The ATM 885R Acoustic Telemetry Modem is a subsea modem that includes an internal modem battery pack and connects to any of the remote transducers with a supplied 2 meter cable The modem can operate either on its internal battery pack or on external DC power User s Manual Physical Characteristics Housing construction Dimensions Mounting Hard coat anodized aluminum 8 9 cm 3 5 in max diameter by 75 4 cm 29 7 in long Stainless steel sidebar P N 003452 Rev E Acoustic Telemetry Modems 2 5 Weight in air 11 kg 24 Ib Weight in water 5 kg 11 Ib Operating depth 2000 m 6560 ft Power Requirements Modem battery pack 21V 18A h External DC input power 14 28 V Lowpower state current 0 5 mA typical 1 0 mA maximum DSP receiver current active 25 mA typical Transmitter current active 1 A average A peak 21 V MF HF 2 A average 5 A peak 21 V LF Input Output Operator controls Plunger type on off switch Power External DC power input Signal RS 232 422 serial interface data Transducers AT 408 or AT 421 Device enable Active low open collector output Maximum sink current is 80 mA Maximum applied voltage is 40 VDC Transducers Available types AT 408 omnidirectional L
94. Maintenance and Troubleshooting This section encompasses the recommended care and maintenance procedures for the subsea modem components of the ATM 880 and ATM 890 Series Acoustic Telemetry Modems Adherence to these procedures will help to ensure many years of continuous reliable performance from the modems In addition a troubleshooting guide is provided which will assist in isolating and correcting some of the basic operational problems that could occur during setup or deployment The care and maintenance of the modems involve two areas general cleaning and inspection and changing the modem battery packs The tools required to perform these tasks include the following 9 64 Allen wrench 5 32 Allen wrench Phillips head screwdriver Flat head screwdriver Wire cutters Silicone O ring lubricant Alcohol wipes Paper towels General Cleaning and Inspection After retrieving a subsea modem clean and inspect the modem as follows 1 Turn the modem off by pulling the on off switch all the way out Refer to Figure 4 4 on page 4 6 for the location of the modem on off switch 2 Using a cloth or paper towel dry the modem thoroughly 3 Unplug the cable from the POWER SERIAL connector on the modem inspect and clean the cable and then clean the connector with an alcohol wipe 8 Maintenance and Troubleshooting General Cleaning and Inspection 8 2 BENTHOS 4 Lubricate the POWER SERIAL connector pins with a light coat of
95. ND SUPPORT PROVIDED PURCHASER UNDER THIS AGREEMENT NO ORAL OR WRITTEN INFORMATION OR ADVICE GIVEN BY BENTHOS ITS AGENTS OR EMPLOYEES SHALL CREATE A WARRANTY OR IN ANY WAY INCREASE THE SCOPE OF THE LIMITED WARRANTY PROVIDED ABOVE ANY AND ALL LIABILITY OF BENTHOS IS EXPRESSLY LIMITED TO THE PRICE PURCHASER HAS PAID FOR THE PRODUCTS PURCHASER S SOLE REMEDY AGAINST BENTHOS IN ANY DISPUTE UNDER THIS AGREEMENT SHALL BE TO SEEK RECOVERY OF THE AMOUNTS PURCHASER PAID PURSUANT TO THE LIMITED WARRANTY PROVIDED ABOVE UPON THE PAYMENT OF WHICH BENTHOS ITS AGENTS AND EMPLOYEES AND AFFILIATES WILL BE RELEASED FROM AND DISCHARGED OF ALL FURTHER OBLIGATIONS AND LIABILITY TO PURCHASER THE LIMITED WARRANTY OF BENTHOS GIVES PURCHASER SPECIFIC LEGAL RIGHTS AND PURCHASER MAY ALSO HAVE OTHER RIGHTS THAT VARY FROM STATE TO STATE SOME STATES DO NOT ALLOW LIMITATIONS ON HOW LONG AN IMPLIED WARRANTY LASTS OR THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES SO THE ABOVE LIMITATIONS OR EXCLUSIONS MAY NOT APPLY TO PURCHASER Liability Benthos assumes no liability for damages losses or costs incurred consequentially through operation or malfunction of Benthos products User s Manual BENTHOS Title Title shall pass to the Buyer on delivery to the carrier at North Falmouth Massachusetts U S A Risk of damage or loss following such delivery shall be the Buyer s and Benthos shall in no way be responsible for safe arrival of the shipm
96. Received will be displayed 6 Modem Operating Modes and Commands Entering Commands 6 48 BENTHOS Doppler correction is effective to 20 knots of relative speed between two modems communicating over the acoustic link Doppler tracking should be enabled if changes in the relative speed between the two modems are expected while transmitting data However with Doppler tracking enabled it is possible to obtain a false Doppler correction in a low signal to noise environment User s Manual P N 003452 Rev E Acoustic Telemetry Modems 6 49 Local Battery Voltage ATV Syntax ATV Enter Definition The Local Battery Voltage command causes the local modem to display the DSP receiver and transmitter power supply voltages which are supplied from the modem battery pack Ca NOTE For the local modem to execute entered commands the modem must be in Command mode with the command prompt gt displayed If the modem is not in Command mode refer to page 6 11 for instructions on how to place the modem into Command mode How to Use To use the Local Battery Voltage command type ATV and then press Enter The local modem will display its DSP receiver and transmitter power supply voltages Special Considerations When using the Local Battery Voltage command take note of the following The accuracy of the DSP receiver power supply voltage measurement is 0 2 V the transmitter power supply voltage measurement 1 0 V While the
97. Register 7 If an acknowledgment is not received Response Not Received will be displayed The accuracy of the DSP receiver power supply voltage measurement is 0 2 V the transmitter power supply voltage measurement 1 0 V 6 Modem Operating Modes and Commands Entering Commands 6 52 BENTHOS While the voltages are being measured the DSP receiver power supply is under load and the transmitter power supply is open circuited NOTE Refer to Table 8 1 on page 8 3 for the estimated modem battery pack capacity remaining verses the voltage of the transmitter power supply User s Manual P N 003452 Rev E Acoustic Telemetry Modems 6 53 Remote Data Logger Enable ATS BEn Syntax AT BEn Enter Definition The Remote Data Logger Enable command causes the remote modem at address n to go into Datalogger mode NOTE For the local modem to execute entered commands the modem must be in Command mode with the command prompt gt displayed If the modem is not in Command mode refer to page 6 11 for instructions on how to place the modem into Command mode How to Use To use the Remote Data Logger Enable command type AT BE followed by the address of the remote modem and then press Enter The remote modem will go into Datalogger mode and then the local modem will respond with the message OK Special Considerations When using the Remote Data Logger Enable command take note of the following To
98. S 2 Click the file name of the file to be opened and then click Open The Sending File window opens and the data are uploaded Sending File File Name C Uploads Upload 2 dat Size of File 183 Bytes File Transfer to Modem Modem Transmission 0 100 Halt Transfer The uploading of data be stopped by clicking Halt Transfer However data will be uploaded until all data received by the modem over the serial interface have been transmitted After the uploading is complete the Sending File window closes and a TelesonarPC window opens acknowledging the file transfer Telesonar PC x i File Transfer Completed 3 To close the window click OK Sending a Break to the Remote Modem The local modem that is connected to a PC will detect a break if itis sent over the serial interface from the PC The local modem will send a command to the online remote modem which will cause the remote modem to send the equivalent break on its serial interface If the remote modem is connected to an RD Instruments Acoustic Doppler Current Profiler the break will wake up and reset the current meter Therefore the current meter performs in the same manner as it would if it received the break directly from the PC To send a break to the remote modem and have the modem send the break on its serial interface choose Acoustic Communication gt Send RDI Break P N 003452 Rev E Acoustic Telemetry Modems 5 41 Oper
99. S02 000 S03 001 S04 005 S05 000 S06 008 507 015 508 060 S09 000 S10 255 S11 001 S12 000 S13 002 514 001 S15 000 S16 000 S17 001 S18 000 5192000 520 000 gt 4 Setup and Test Checking the Modems and Host Processors 4 18 User s Manual BENTHOS Setting a Modem s Operating Parameters The S Register settings of the modem can be set whenever the modem is in Command mode the mode in which the command prompt gt is displayed If the modem is not in Command mode type in rapid succession The command prompt will be displayed The Set Register Command ATSn n is used to set an S Register setting where the first n in the command is the S Register number and the n following the equal character is the desired setting The Write command AT amp W can be used to save the S Register settings as the new startup configuration where the changed settings become the new default settings which are the settings when the modem is powered up NOTE Refer to Section 6 Modem Operating Modes and Commands for detailed information on the modem commands and how enter them Perform the steps listed below to verify that the S Registers can be set by setting S Register 4 to 07 and making it the default setting for the startup configuration 1 At the command prompt gt type ATS4 07 and then press Enter The command is executed the modem responds with the message OK and the command prompt is again displayed ATS4 07
100. ST PC DB 9 ATM 891 I O CONNECTOR SIGNAL CONNECTOR DIRECTION LABEL FUNCTION LABEL FUNCTION RXD Receive Host to Modem TXD Transmit TXD Transmit Modem to Host RXD Receive Request to Ie Send Modem to Host CTS Clear to Send GND Ground GND Ground User s Manual P N 003452 Rev E Acoustic Telemetry Modems 4 9 Setting up the Subsea Modems Setting up any of the subsea modems requires making the power and serial interface connections and for an ATM 885R or ATM 887R Acoustic Telemetry Modem the transducer connections Power and Serial Interface Connections The power and serial interface connections are made with the POWER SERIAL connector located on the bottom end cap of the subsea _ modem Either an RS 232 or an RS 422 serial Figure 4 6 Subsea Modem interface connection can be made When BOWERISERIAE Connector connecting the subsea modem to a PC or to an instrument refer to Figure 4 6 for the POWER SERIAL connector pin orientation and to Table 4 3 for the pinout information The POWER SERIAL connector is a 9 pin Impulse MBH 9 MP bulkhead connector that requires an Impulse MIL 9 FS mating connector pigtail Table 4 3 Subsea Modem POWER SERIAL Connector Pinouts SIGNAL PIN LABEL FUNCTION DIRECTION Power External Power Input 21 28 VDC To Modem Reserved GND Common Ground TX RS 422 Transmit Modem to Host DE Device Enable See NOTE below Modem to Ho
101. Save as type all Files 4 Cancel 2 Figure 5 15 The Capture File Dialog Box User s Manual P N 003452 Rev E Acoustic Telemetry Modems 5 39 5 TelesonarPC 4 Click Save to save the data to the specified file and close the Capture File dialog box CAPTURE ON is displayed on the Status bar and the received data are saved to the file 5 To stop the capture of received data Choose File Transfer gt Capture CAPTURE OFF is displayed on the Status bar and the received data are no longer saved Uploading Data from a File to the Remote Modem Data from a file can be uploaded to the online remote modem The data are transferred directly from a file on the PC to the remote modem and from the remote modem to its host over the serial interface To upload data from a file to a remote modem 1 Choose File Transfer gt Send File The Open File to Upload dialog box shown in Figure 5 16 opens If the data file is not listed it may be in a different folder than the one shown If this is the case click the arrow in the Look in drop down list box and select the folder in which the file is located Open File to Upload 21x Look in Uploads amp al ce Text file tet Upload 1 dat Upload 1 txt a Upload 2 dat Upload 2 t t Files of type All Files Cancel 2 Figure 5 16 The Open File to Upload Dialog Box Operating the Modems after Deployment 5 40 User s Manual BENTHO
102. TRONICS PRESSURE ACTIVATED confidentiol to Benthos Inc and may not be used reproduced or disclosed without the express written consent of Benthos DRAWN BY ON OFF SWITCH TRANSDUCER GUARD BENTHOS 49 Edgerton Drive North Falmouth MA 02556 U S A TITLE OUTLINE ATM 885 MODEM BREAK SHARP EDGES EXCEPT AS NOTED R 010 ALL surfoces except os noted CHECKED BY APPROVED BY DRAWING NUMBER REVISION AB 5 08446 DRAWING FILE NANE AB7508446A DWG 07 29 97 SAE ser OF 1 swopow 391WU9 91 2nsnooy 6 jenuew sasn v6 DATE REVIECO DESCRIPTION 01 06 01 8281 UP DATED TO BENTHOS FORMAT GC RDS 12 05 01 A 18896 UPDATED DRAWING GC ALUMINUM PRESSURE CASE 2X 0 50 DRILL THRU FILTER SUPPLY PCB 3 A9Y 25700 Nid CONNECTOR GUARD CONNECTOR FOR EXTERNAL POWER AND SERIAL INTERFACE N SS N N CONNECTOR FOR CONNECTION TO REMOTE TRANSDUCER USE BENTHOS CABLE ASSY P N 007810 BATTERY PACK USE BENTHOS PIGTAIL P N 006475 TOLERANCES EXCEPT AS NOTED X 24 015 XX 010 XXX_ 005 FRACTIONAL Hole size 1 64 amp location 32 General BREAK SHARP EDGES EXCEPT AS NOTED R 010 63 ALL surfoces except os noted ELECTRONICS CONFIDENTIAL This document and the information contoined therein is proprietary and confidential to Benthos Inc an
103. User s Manual P N 003452 Rev E Acoustic Telemetry Modems 7 11 Acoustic Baud Rate 54 Default Setting 05 The transmitting acoustic baud rate of the modem is 800 bits second with rate 1 2 convolutional coding and 12 5 ms multipath guard period Definition The setting of S Register 4 determines the transmitting acoustic baud rate the modulation scheme MFSK or PSK and whether any one or more of the three methods for increased reliability are used which are data redundancy convolutional coding and multipath guard period NOTE The setting of S Register 4 determines the transmitting acoustic baud rate only The receiving modem will receive data and commands from the transmitting modem regardless of the baud rate of the transmitting modem Therefore the baud rates can be different in each direction for an asymmetrical acoustic link Only an ATM 890 Series Acoustic Telemetry Modem however can receive the baud rates of settings 09 13 below Available Settings The range of settings for S Register 4 is from 02 to 13 as follows 02 140 bits sec MFSK repeated four times with rate 1 2 convolutional coding and 25 ms multipath guard period 03 300 bits sec MFSK repeated twice with rate 1 2 convolutional coding and 25 ms multipath guard period 04 600 bits sec MFSK with rate 1 2 convolutional coding and 25 ms multipath guard period 05 800 bits sec MFSK with rate 1 2 convolutional coding and 12 5 ms multipath guard period 06
104. a floor Multipath Interference and Reflections The factor that most restricts both the baud rate and the reliability of an acoustic modem is multipath Multipath which is particularly severe when attempting to communicate over the horizontal channel in shallow water is the result of sea surface and sea floor reflections reflections from objects that are near the receiving modem and refractions from thermal gradients and water turbulence Using directional remote transducers reduces the effects of multipath when the transducers are aimed at each other yet reflections from objects such as piers or boats that are near the receiving transducer cause overlapping of the received signals resulting in decreased reliability In addition multipath is usually not stationary hence even techniques used to track and reduce the effects of multipath do not significantly improve modem performance in increasingly dynamic multipath situations As a result multipath forces continual trade offs in the speed the reliability and the cost of acoustic modems 1 Overview Barriers to Underwater Communications 1 16 BENTHOS High Performance Modulation Techniques To reduce the effects of the physical barriers to underwater communications and provide high modem performance the ATM 880 and ATM 890 Series Acoustic Telemetry Modems employ both PSK and MFSK modulation techniques PSK modulation allows the modems to operate at up to 15 360 bits sec It also has
105. aced Entering Commands BENTHOS NOTE For the local modem to execute entered commands the modem must be in Command mode with the command prompt gt displayed If the modem is not in Command mode refer to page 6 11 for instructions on how to place the modem into Command mode How to Use To use the Release Status command type AT T followed by the address of the release and then press Enter The release will transmit its release status and the local modem will display the information described above User s Manual P N 003452 Rev E Acoustic Telemetry Modems 6 77 Release AT RN m Syntax AT Rn m Enter Definition The Release command causes the SMART Release at address n with release code m to activate its release mechanism NOTE For the local modem to execute entered commands the modem must be in Command mode with the command prompt gt displayed If the modem is not in Command mode refer to page 6 11 for instructions on how to place the modem into Command mode How to Use To use the Release Status command type AT Rn m Enter where n is the address of the release and m is the release code The message Valid release code waiting for confirmation should be displayed If the release code is incorrect the message Invalid release code will be displayed instead If the correct release code was received the next message displayed should be RELEASED and CONFIRMED which a
106. ack can provide power in the lowpower state for over 3 years However when the DSP and the receiver are active hence not in the lowpower state a relatively large amount of current is drawn from the modem battery pack while the modem receives data or commands typically 25 mA The most current is drawn when the modem is transmitting typically 1 A to a maximum of 2 A Therefore unless a modem is to be deployed for well over a year with few transmissions it is the amount of data to be transmitted that determines its useful deployment life Processing Overhead When transmitting a packet of data which is the entire contents of one of the four available internal 4 kbyte transmit data buffers an additional 2 bytes are transmitted and the transmitter remains active an additional 1 2 seconds over that required to transmit the actual data The same is true if only a partial packet is transmitted Refer to Transmit Data Buffers on page 6 3 for information on the four 4 kbyte transmit data buffers The additional bytes constitute the processing overhead and should be taken into account when transmitting a small amount of data many times gt NOTE TelesonarPC provides a convenient method for calculating the modem battery pack capacity required for various deployment conditions Refer to Battery Pack Capacity Usage and Deployment Length Calculations on page 5 11 for more information User s Manual P N 003452 Rev E Acoustic Teleme
107. address is the setting of S Register 14 after being powered up or awakened from its lowpower state A modem can be placed into Online mode in any of the following ways Using the Dial command ATDn From Command mode only entering the Dial command will cause the modem to go into Online mode and to go online with the remote modem at address n Using the Online command ATO From Command mode only entering the Online command will cause the modem to go into Online mode and to go online with the modem whose address is the setting of S Register 14 The Online command also sets S Register 15 to 01 Setting S Register 15 to 01 From Command mode only setting S Register 15 to 01 will cause the modem to go into Online mode and to go online with the remote modem whose address is the setting of S Register 14 Using the Lowpower State command ATL S Register 15 set to 01 From Command mode only and if S Register 15 is set to 01 entering the Lowpower State command will place the modem into Online mode The P N 003452 Rev E Acoustic Telemetry Modems 6 3 modem will also go into the lowpower state When awakened the modem will be online with the remote modem whose address is the setting of S Register 14 Allowing the idle time to expire S Register 15 set to 01 If S Register 15 is set to 01 allowing the idle time to expire will place the modem into Online mode The modem will also go into the lowpower state When awakened the modem
108. al Connector J4 to DB 9 Pin to Pin Connections ATM 885PCB and ATM 885RPCB DSP BOARD SIGNAL SERIAL CONNECTOR J4 DIRECTION LABEL FUNCTION LABEL FUNCTION HOST PC DB 9 CONNECTOR TXD Transmit Modem to Host RXD Receive RXD Receive Host to Modem TXD Transmit Request to Send GND Common Ground GND Ground RTS Modem to Host CTS Clear to Send ATM 885PCB Transducer Connections The ATM 885PCB includes an omnidirectional or directional transducer and a transducer cable Connect the transducer cable to the transducer and to J2 of the Transmitter Board Table 4 8 shows the pinout information for the connectors on the transducer cable A wiring diagram for the transducer cable is shown in Figure 4 8 The transducer cable transducer connector is an Impulse RMG 3 FS connector Table 4 8 ATM 885PCB Transducer Cable Wiring TRANSDUCER TRANSMITTER CABLE BOARD J2 tede MC TRANSDUCER CONNECTOR Transducer 3 1 2 No Connection 3 Transducer 2 4 Shield 1 4 Setup and Test Setting Up the Modems 4 14 BENTHOS IMPULSE RMG 3 FS RMG FS FACE VIEW 5 a 2 000 J2 XMITTER PCB pun 2 COND W SHLD CUSTOMER SUPPLIED CONNECTIONS IMPULSE RMG 3 FS WHITE 3 1 RED BLACK 2 3 BLACK SHIELD 1 4 SHIELD BRAID DRAIN Figure 4 8 ATM 885PCB Transducer Cable Wiring Diagram
109. al modem When enabled the display is updated once a second The displayed value ranges from 5 dB to 80 dB where a small value indicates a strong signal is being received anda large value indicates a weak signal is being received The displayed value is also an indication of the relative amount of background noise present when there are no modems transmitting The settings for n are 00 and 01 as follows 00 Disable display of AGC output 01 Enable display of AGC output The following is a rough guide for interpreting the relative amount of background noise when there are no modems transmitting Greater than 67 dB No signal Indicates a problem with the transducer or preamplifier Ensure that the transducer is connected 30 67 dB Normal range Indicates quiet conditions 15 30 dB Some background noise Although communications over the acoustic link is possible the range will be reduced Less than 15 dB Considerable background noise Communications over the acoustic link will be severely limited 6 Modem Operating Modes and Commands Entering Commands 6 74 User s Manual BENTHOS NOTE For the local modem to execute entered commands the modem must be in Command mode with the command prompt gt displayed If the modem is not in Command mode refer to page 6 11 for instructions on how to place the modem into Command mode How to Use To use the AGC Diagnostic command type ATTN followed by the value of
110. are RTS CTS handshaking cannot be disabled Refer to RS 232 Driver Flow Control S11 on page 7 25 for more information 5 In the Handshaking area select the required handshaking 6 Click SET to save the new selections and close the PC Configuration dialog box User s Manual P N 003452 Rev E Acoustic Telemetry Modems 5 17 5 TelesonarPC Selecting the Range Options TelesonarPC calculates and displays the range from the local modem s transducer to the online remote modem s transducer in units of kilometers meters statute miles feet or nautical miles The range is displayed in the Range Status display in the Main window when selecting Acoustic Communication from the Menu bar and then choosing Get Range The range is also displayed in the Automatic Ranger window when using auto ranging as described in Auto Ranging between the Local and Remote Modem s Transducers on page 5 33 The range calculation is based on the default value of the speed of sound in water of 1500 meters per second However the units of range are selectable and the speed of sound used in the calculation of range can be changed To select the units of range or to change the speed of sound in water used in the calculation of range or both 1 Choose Configuration gt Range Options The Range Options dialog box shown in Figure 5 7 opens Range Options x Range Units C Kilometers C Statute Miles Feet C Nautical Miles Speed of Sound 1
111. at a 0 800 ms rate 1 25 Hz at the selected frequency and with a pulse width of 3 125 ms WARNING If the modem uses a battery pack for power and the modem is left pinging for an extended period the battery pack will be depleted P N 003452 Rev E Acoustic Telemetry Modems 5 47 5 To stop the ping test and leave the Ping Test dialog box open click Stop Ping to stop the ping test and close the dialog box click the Cancel button Checking the Local Modem s Firmware Version Number To check the local modem s firmware version number 1 Choose Diagnostic gt Version The Modem Version window opens Modem Version 1 STANDARD VERSION 4 0 2 To close the Modem Version window click OK NOTE The local modem s firmware version number is not the TelesonarPC version number To check the TelesonarPC version number choose Help gt About TelesonarPC 5 TelesonarPC Modem Diagnostics Acoustic Telemetry Modems 6 1 6 Modem Operating Modes and Commands This section provides an overall description of the 880 and 890 Series Acoustic Telemetry Modem operating modes along with descriptions of each of the modem commands and how to enter and use them The operating modes determine how a modem handles data and commands The modem commands which are input to a modem from its host processor over the serial interface control the operation of the modem An understanding of the operating mode
112. ately after the first transmit data buffer has filled the 4 kbyte data packet is transmitted However if the transmit data buffer does not fill the data are transmitted anyway a preset time after the last data are input This time is the forwarding delay Similarly wnen a modem is in Datalogger mode the data in its 8 kbyte temporary data buffer are transferred to the data logger memory immediately after the buffer has filled or after the forwarding delay NOTE While data are being transmitted from a 4 kbyte transmit data buffer data can continue to be input to the modem over the serial interface filling the additional 4 kbyte transmit data buffers Available Settings The range of settings for S Register 8 is from 01 to 100 where each increment represents 0 05 seconds for a time range of 0 05 to 5 0 seconds Special Considerations When setting S Register 8 take note of the following The transmission efficiency is improved if the 4 kbyte transmit data buffer is allowed to fill before transmitting the data 7 Modem Operating Parameters S Registers 7 20 User s Manual BENTHOS Handshaking should be used to ensure there is no loss of data when the 8 kbyte temporary data buffer or all four of the 4 kbyte transmit data buffers are full This also applies when the modem is transferring data from the temporary data buffer to the data logger memory transmitting the contents of the data logger memory over the acoustic link or
113. ating a SMART Release 5 TelesonarPC In addition to the standard modem operator functions TelesonarPC includes commands for acquiring and displaying the status of a SMART Release and activating its release mechanism NOTE As the SMART Release is also an ATM 880 Acoustic Telemetry Modem all the operator functions described in Operating the Modems after Deployment on page 5 31 apply to the SMART Release Checking the Status of a SMART Release The status of a SMART Release can be checked at any time even after the release mechanism has been activated The status information includes whether the release is armed released and confirmed or released and not confirmed whether the release is tilted and whether the battery voltage is low To check the status of a SMART Release 1 Select the address of the SMART Release in the Remote ID Status display and then click SET The local modem goes online with the SMART Release 2 Choose Acoustic Communication gt Check Release Status The Release Status window opens and displays the status information Release Status Je The Release is Armed 3 To close the Release Status window click OK Operating a SMART Release 5 42 User s Manual BENTHOS Activating the Release Mechanism of a SMART Release Activating the release mechanism of a SMART Release requires both the address of the modem and its release code The address and the release code ar
114. ble output P N 003452 Rev E Acoustic Telemetry Modems 6 45 Range ATRn Syntax ATRn Enter Definition The Range command causes the local modem to display the range from the local modem to the remote modem at address n The displayed range is from 0 to 999 9 meters in increments of tenths of meters and 1000 to 9999 meters in increments of one meter NOTE For the local modem to execute entered commands the modem must be in Command mode with the command prompt gt displayed If the modem is not in Command mode refer to page 6 11 for instructions on how to place the modem into Command mode How to Use To use the Range command type ATR followed by the address of the remote modem and then press Enter The local modem will respond by displaying the range in meters to the remote modem Special Considerations When using the Range command take note of the following The displayed range is the one way range to the remote modem and is determined acoustically based on a sound speed in seawater of 1500 meters second To acquire the range to a remote modem the local modem transmits an interrogation signal to the remote modem and when the remote modem receives the signal it responds with a reply The local modem must receive the reply from the remote modem within the acoustic response timeout which is determined by the setting of S Register 7 If an reply is not received Response Not Received will be displa
115. ch is connected to a local host processor a PC through its RS 232 serial port The remote modem is an ATM 885 which is connected to an instrument through its RS 232 serial port ATM 891 ATM 885 ACOUSTIC LOCAL LINK REMOTE MODEM MODEM RS 232 LINK RS 232 LINK PC INSTRUMENT LOCAL REMOTE HOST HOST Figure 4 1 Setup with ATM 891 Deck Box as the Local Modem User s Manual P N 003452 Rev E Acoustic Telemetry Modems In another typical configuration the local modem is one of the subsea modems which is connected to a host processor An example of this is shown in Figure 4 2 where an ATM 885 is the local modem In this setup the local modem communicates with three remote modems which are also ATM 885 modems and where each is connected to an instrument ATM 885 LOCAL MODEM PC LOCAL HOST INSTRUMENT 1 ATM 885 REMOTE RS 232 REMOTE MODEM 1 HOST 1 INSTRUMENT 2 ATM 885 REMOTE RS23 REMOTE MODEM 2 HOST 2 INSTRUMENT 3 ATM 885 REMOTE RS23 REMOTE MODEM 3 HOST 3 Figure 4 2 Setup with ATM 885 as Local and Remote Modems Modem Connections Although cables are supplied special installations might require customer supplied cables and connectors For this purpose complete connector and pinout descriptions are provided in the following
116. cknowledges that the release mechanism has been activated and that the release has released itself from its mooring If instead the message RELEASED and NOT CONFIRMED is displayed the release mechanism has been activated but the release has not released itself from its mooring 6 Modem Operating Modes and Commands Entering Commands Acoustic Telemetry Modems 7 1 7 Modem Operating Parameters S Registers The ATM 880 and ATM 890 Series Acoustic Telemetry Modem operating parameters are determined from settings that are stored in 21 nonvolatile memory locations called S Registers SO S20 The operating parameters include the serial interface and transmitting acoustic baud rates the modem address the idle time the transmit power level the forwarding delay and a number of other parameters that affect the operation of the modem The modem operating parameters and their corresponding S Register settings are listed in Table 7 1 on page 7 2 Also listed in the table are the page references to where detailed descriptions of the S Registers and their available settings are provided The S Register settings of a local modem can only be made when the modem has been connected to a host processor and is in Command mode For information on how to set up the modem refer to Setting Up the Modems on page 4 7 When the modem is powered up the S Register settings are automatically set to their default settings which is their startup configuratio
117. cksum MPD Multipath delay SNR Signal to noise ratio SPD Relative speed between the modems AGC Automatic gain control output CCERR Number of corrected errors Refer to Acoustic Link Test ATXn on page 6 27 for more information on the Acoustic Link Test command and the received data statistics Type AT Sn where n is the address of the modem that will receive the command and then press Enter The modem transmits its S Register settings over the acoustic link and they are displayed as in the following example Remote Registers 500 041 S01 001 S02 000 S03 002 S04 005 S05 000 S06 008 507 015 S08 060 S09 000 S10 255 S11 000 S12 000 S13 003 S14 000 S15 000 S16 000 S17 001 S18 001 S19 000 S20 000 gt P N 003452 Rev E Acoustic Telemetry Modems 5 1 5 TelesonarPC TelesonarPC which runs on the Microsoft Windows 98 2000 NT XP operating system is a graphical users interface GUI software program that provides a user friendly means of configuring and operating the ATM 880 and ATM 890 Series Acoustic Telemetry Modems including the SMART Release without having to enter specific commands NOTE When using TelesonarPC any reference to a local modem refers to the modem to which commands and data are input from the PC over the serial interface Any reference to a remote modem refers to the modem to which acoustic commands are sent and from which data and acknowledgments are received over the acoustic link
118. culate to calculate and display the required battery pack Capacity usage or the maximum deployment length For the battery pack capacity usage calculation the Battery Calculation window opens with the battery pack capacity requirements displayed and a notification indicating whether the selected battery pack is adequate Battery Calculation EJ 4 5 A HRs Required Standard 18 4 HR Alkaline Pack Has been derated for temperature to 13 5 A HRs Can Be Deployed with Standard Alkaline Pack For the maximum deployment length calculation the Battery Calculation window opens with the maximum number of days displayed for the type of battery pack selected 12 Click OK in the Battery Calculation window and then click the Cancel button in the Battery Pack Calculation dialog box to close it Configuring the Local and Remote Modems 5 TelesonarPC To configure an ATM 880 or ATM 890 Series Acoustic Telemetry Modem the modem must be connected to an available COM port on a PC it must be switched on and TelesonarPC must be running with the Main window open as shown in Figure 5 2 on page 5 6 The local and the remote modem s serial communications port and its operating parameters or S Registers can then be configured A remote modem can also be configured remotely over the acoustic link Selecting and Configuring the Local Modem s Serial Communications Port To select and configure the local modem s serial communications port 1 Connect the l
119. d may not be used reproduced or disclosed without the express written consent of Benthos DRAWN BY CHECKED BY APPROVED BY DRAWING FILE NAME A97 5086764 DWG DATE 7 29 97 ME NTS sw 1 or 1 DRAWING NUMBER PRESSURE ACTIVATED ON OFF SWITCH BENTHOS 49 Edgerton Drive North Falmouth MA 02556 U S A OUTLINE ATM 885R MODEM AB 5 086 6 REVISION SOHLN38 SBUIMEJG 6 CONFIDENTIAL JBENTHOS DENEN 4 015 This document ond the information 49 Edgerton Drive XX 010 contained therein is proprietary and North Falmouth MA 02556 U S A EET TEN m 005 confidentiol to Benthos Inc ond 11 64 Hole size not be used reproduced or disclosed p ilhout the ilt nsent 41 32 o Bis o OUTLINE ATM 887 pur i ems e SLE ouo e PP eee NOTEO R 010 APPROVED ev RDS B845 08339 ALL surfoces es ne EET 8896 UPDATE DRAWING GC spe UP DATED TO BENTHOS FORMAT ECO NO DESCRIPTION DR CHK except noted 5 FILE NAU B84508339A DWG E 4 6 96 SF NTS swopow 391WU9 91 2nsnooy 9 6 enuen sasn 3 A9Y 25700 N d 4 56 HOLE THRU FILTER SUPPLY PCB PRESSURE ACTIVATED ON OFF SWITCH SERIAL 1 0 AND POWER Ex ga YU GAME 7 V BATTERY PACKS 9 CONNECTORS FOR SERIAL 1 0 AND EXTERNAL POWER SERIAL 1 0 USES BENTHOS PIGTAIL ey 006475 EXTERNAL POWE PIGTAIL P N 002193 ELECTRON
120. dem will display the message CONNECT followed by the transmitting acoustic baud rate of the local modem When the local and remote modems are online the local modem will transmit all the data received from its host processor to the remote modem which will in turn output the data to its host processor Similarly the remote modem will transmit all the data received from its host processor to the local modem which will in turn output the data to its host processor Special Considerations When using the Dial command take note of the following To display the message CONNECT followed by the transmitting acoustic baud rate and many other messages S Register 13 must be set to either 01 or 02 where 01 is the factory default setting The local modem must receive an acknowledgment from the remote modem within the acoustic response timeout which is determined by 6 Modem Operating Modes and Commands Entering Commands 6 20 BENTHOS the setting of S Register 7 If an acknowledgment is not received Response Not Received will be displayed The Dial command sets S Register 14 of the remote modem to the address of the local modem The Dial command sets S Register 14 of the local modem to the address of the remote modem If itis desired to enter commands after going online with the remote modem type in rapid succession to cause the local modem to go into Command mode Then enter the desired commands To go back online with
121. dems and host processors are set up some simple preliminary checks can be made to verify that the modems are operating properly and that all of the connections are correct Verifying Operation of the ATM 891 Deck Box If an ATM 891 Deck Box is set up perform the steps listed below to check its operation 1 Connect the AC power cable to an available 100 120 VAC 50 60 Hz or 200 240 VAC 50 60 Hz power source or the DC power cable to a 21 28 VDC power supply 2 Switch the AC ON OFF switch on the front panel of the deck box to ON or switch on the DC power supply 3 Rub the remote transducer head to check the connection between the transducer and the modem When rubbing the transducer sounds should be heard coming from the speaker on the front panel of the deck box If the sounds cannot be heard increase the speaker volume by adjusting the VOLUME control 4 Switch the AC ON OFF switch on the front panel of the deck box to OFF or switch off the DC power supply Verifying a Modem s Operating Parameters When a modem is powered up it will initialize a number of modem operating parameters such as the serial interface and transmitting acoustic baud rates the modem address and other parameters These operating parameters are stored in S Registers and they can be changed from the host processor by using modem commands A changed S Register setting can also be made the new default setting which is its setting when the modem
122. disabled the check mark precedes Disabled To enable the function place the mouse pointer on Enable and click the left mouse button to disable the function do the same for Disable Some menu items may be dimmed such as the Disable Datalogger command and several others in the Datalogger menu shown in Figure 5 3 This signifies the item cannot be chosen at the current time When the item is available it is displayed normally NOTE To close a menu without choosing a menu item click anywhere outside the menu Status Bar The Status bar is located at the bottom of the Main window as shown in Figure 5 2 on page 5 6 The Status bar provides information about the local modem including the COM port of the PC that itis connected to whether the modem is initializing is online with another modem is waiting for a response or is in some other operating state The Status bar also indicates the frequency band selected for the modem whether Capture is on or off and the current time and date For information on Capture refer to Capturing Received Data from the Remote Modem on page 5 38 The Main Window 5 8 BENTHOS Status Displays The Status displays provide information about the local and remote modems Some of the Status displays such as the Acoustic Baud Rate the Remote ID and the Power Level Status displays can also be used to send commands to the local modem and to the remote modem that is online with the local modem The Status
123. displays are shown in the Main window in Figure 5 2 on page 5 6 and are described below Prida eNe RNE Acoustic Baud Rate Displays and Downlink E selects the downlink acoustic transmit INI baud rate bits second of the local Uplink 2400 ser modem and the uplink acoustic transmit 2400 Max baud rate of the online remote modem To select the baud rate for either modem click the up or down arrow in the corresponding drop down list box until the desired setting is displayed When changed the display turns blue Then click SET When the new baud rate is set the display turns back to black Remote ID 000 ser Remote ID Displays and selects the address of the remote modem to which commands and data can be sent Any address from 000 to 099 can be selected To select the address click the up or down arrow in the scroll box until the desired setting is displayed When changed the display turns blue Then click SET When the new address is set the display turns back to black Local Power Level FULL SET Local and Remote Power Levels Remote Power Level 21d8 SET Displays and selects the transmit power level in decibels of the local modem and the online remote modem To select the power level for either modem click the up or down arrow in the User s Manual P N 003452 Rev E Acoustic Telemetry Modems 5 TelesonarPC Relative Speed Range Battery Voltage Local 259v
124. e OK and many other messages S Register 13 must be set to either 01 or 02 where 01 is the factory default setting The local modem must receive an acknowledgment from the remote modem within the acoustic response timeout which is determined by the setting of S Register 7 If an acknowledgment is not received Response Not Received will be displayed The time required to clear a remote modem s data logger memory is approximately 20 seconds plus the one way sound travel time for the acoustic command to reach the remote modem Since sound travels at 6 Modem Operating Modes and Commands Entering Commands 6 62 BENTHOS about 1500 meters second in seawater it will take approximately 22 seconds to clear the data logger memory of a remote modem that is 3000 meters away from the local modem While the contents of the remote modem s data logger memory are being cleared the remote modem will not accept any input over the serial interface or over the acoustic link User s Manual P N 003452 Rev E Acoustic Telemetry Modems 6 63 Remote Bytes Stored ATSBNn Syntax AT BNn Enter Definition The Remote Bytes Stored command causes the local modem to display the number of bytes of data stored in the data logger memory of the remote modem at address n Ca NOTE For the local modem to execute entered commands the modem must be in Command mode with the command prompt gt displayed If the modem is not in Command mode refer to
125. e buffer will be cleared 6 Modem Operating Modes and Commands Operating Modes BENTHOS When more than 8 kbytes of data are to be stored the use of handshaking which uses the RS 232 signal RTS should be used to ensure there is no loss of data WARNING If handshaking is not used and data are input to the modem when the 8 kbyte temporary data buffer is full or while the modem is transferring data from the temporary data buffer to the data logger memory transmitting the contents of the data logger memory over the acoustic link or clearing the contents of the data logger memory the data will be ignored hence lost Handshaking will ensure there is no loss of data as when the 8 kbyte temporary data buffer is full or when data is being transferred to or transmitted from the data logger memory or the contents of the data logger memory is being cleared handshaking will not allow the host processor to output data to the modem Refer to Setting Up the Modems on page 4 7 for information on how to set up the modems The recommended setup uses the RS 232 handshaking signal RTS when connecting the modems Entering Commands User s Manual Commands can only be entered when a modem has been connected to a host processor and is in Command mode For information on how to set up the modem refer to Setting Up the Modems on page 4 7 The commands are input to the modem from its host processor over the serial interface at the baud rate of th
126. e disabled only for the transmitting modem and only if it is known that the receiving modem will never go into the lowpower state To prevent the receiving modem from going into the lowpower state set its S Register 10 to 255 Disabling the lowpower wakeup signal lengthens the modem battery pack life for the transmitting modem 7 Modem Operating Parameters S Registers 7 38 BENTHOS User s Manual P N 003452 Rev E Acoustic Telemetry Modems 7 39 Modem Address 18 Default Setting 00 The address of the modem is 00 Definition The setting of S Register 18 determines the address of the modem Available Settings The range of settings for S Register 18 is from 00 to 99 This provides a total of 100 addresses Special Considerations When setting S Register 18 take note of the following S Register 18 cannot be changed remotely over the acoustic link therefore it is important that the correct address be set prior to deploying the modem The same address can be used for more than one modem however this may not be desirable in some situations 7 Modem Operating Parameters S Registers 7 40 BENTHOS User s Manual P N 003452 Rev E Acoustic Telemetry Modems 7 41 Reserved 19 7 Modem Operating Parameters S Registers 7 42 BENTHOS User s Manual P N 003452 Rev E Acoustic Telemetry Modems 7 43 Reserved 20 7 Modem Operating Parameters S Registers Acoustic Telemetry Modems 8 1 8
127. e drawings when setting up and installing the modems Surface Modems B 270 54 Outline ATM 891 Deck Box Subsea Modems A875 08446 Outline ATM 885 Modem A875 08676 Outline ATM 885R Modem B845 08339 Outline ATM 887 Modem B877 08723 Outline ATM 887R Modem Modem Board Sets B875 08659 Outline ATM 885 PCB OEM Board Set Sheets 1 amp 2 B875 08693 Outline ATM 885R PCB OEM Board Set Remote Transducers A875 08689 Outline ATM 408 Transducer LF B421 08716 Outline ATM 421 Transducer LF A875 09248 Outline ATM 421 Transducer MF Wiring Diagrams When viewing this manual in Adobe Acrobat Reader clicking a drawing number below will open the drawing in Adobe Acrobat Reader C875 08675 Wiring Diagram ATM 87XR D 270 22 Wiring Diagram ATM 891 9 Drawings Surface Modems User s Manual 14 00 IN BENTHOS 02556 U S A NTHOS hara M DECKBOX B 270 54 09 05 02 North OBE OUTLINE ATM 891 CONFIDENTIAL x praem CHECKED BY B270054A DWG ICES IEXCEPT AS NOTED KIKIKIKI IE P N 003452 Rev SBUIMEJG 6 TO ATION oa ALUMINUM PRESSURE 2X 9 50 DRILL THRU FILTER SUPPLY PCB TRANSDUCER CONNECTOR GUARD CONNECTOR FOR EXTERNAL POWER BATTERY PACK AND SERIAL INTERFACE USE BENTHOS PIGTAIL P N 006475 FRACTIONAL Hole size 1 64 amp location 32 General ELEC
128. e in Command mode with the command prompt gt displayed If the modem is not in Command mode refer to page 6 11 for instructions on how to place the modem into Command mode How to Use To use the Remote Power command type AT P followed by the address of the remote modem a comma character and the value of m as determined by the required transmit power level and then press Enter The remote modem will set its transmit power level and then the local modem will respond with the message OK 6 Modem Operating Modes and Commands Entering Commands 6 32 User s Manual BENTHOS Special Considerations When using the Remote Power command take note of the following To display the message OK and many other messages S Register 13 must be set to either 01 or 02 where 01 is the factory default setting The local modem must receive an acknowledgment from the remote modem within the acoustic response timeout which is determined by the setting of S Register 7 If an acknowledgment is not received Response Not Received will be displayed P N 003452 Rev E Acoustic Telemetry Modems 6 33 Remote Baud Rate AT An m Syntax AT An m Enter Definition The Remote Baud Rate command sets the transmitting acoustic baud rate of the remote modem at address n to m The range of settings for m is from 02 to 13 as follows 02 03 04 05 06 07 08 09 10 11 12 13 140 bits sec MFSK repea
129. e or implosion Benthos reserves the right to modify its warranty at any time in its sole discretion THIS LIMITED WARRANTY IS NOT TRANSFERABLE LIMITATION OF LIABILITY BENTHOS MAKES NO OTHER WARRANTY REGARDING ITS PRODUCTS OR THE PRODUCTS OF OTHERS EITHER EXPRESS OR IMPLIED AND ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE WHICH EXCEEDS THE FORGOING WARRANTIES IS HEREBY DISCLAIMED BY BENTHOS AND EXCLUDED FROM ANY AGREEMENT MADE BY ACCEPTANCE OF ANY ORDER BENTHOS DOES NOT ACCEPT LIABILITY BEYOND THE REMEDIES SET FORTH HEREIN INCLUDING ANY LIABILITY FOR PRODUCTS NOT BEING AVAILABLE FOR USE OR FOR LOST OR CORRUPTED DATA LOSS OF BUSINESS LOSS OF PROFITS LOSS OF USE OF THE PRODUCT OR ANY ASSOCIATED EQUIPMENT COST OF CAPITAL COST OF SUBSTITUTE OR REPLACEMENT PRODUCT FACILITIES OR P N 003452 Rev E Acoustic Telemetry Modems iii SERVICES DOWN TIME CHARGES FOR PURCHASER S TIME AND EFFORT THE CLAIMS OF THIRD PARTIES INJURY TO PROPERTY OR ANY OTHER DIRECT INDIRECT SPECIAL RELIANCE INCIDENTAL OR CONSEQUENTIAL DAMAGES REGARDLESS OF THE NATURE OF THE CLAIM AND WHETHER OR NOT FORESEEABLE AND WHETHER OR NOT BASED ON BREACH OF WARRANTY CONTRACT OR TORT INCLUDING NEGLIGENCE OR STRICT LIABILITY EVEN IF BENTHOS HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES OR FOR ANY CLAIM BY ANY THIRD PARTY EXCEPT AS EXPRESSLY PROVIDED HEREIN THIS LIMITATION OF LIABILITY APPLIES BOTH TO PRODUCTS AND SERVICES A
130. e printed on the label that is attached to the SMART Release housing To activate the release mechanism of a SMART Release 1 Select the address of the SMART Release in the Remote ID Status display and then click SET The local modem goes online with the SMART Release 2 Choose Acoustic Communication gt Send Release Command The Send Release Command dialog box opens Send Release Command This command will release the Smart Release with ID 0 To release enter the release code and click SEND To cancel click the CANCEL button T T Enter the release code Status Release Code Status Release Confirmation 3 Inthe Send Release Command dialog box enter the release code in the Enter the release code text box 4 Click Send If the release code is correct Verified is displayed for the Release Code Status in the Status area of the Send Release Command dialog box and Waiting for Confirmation is displayed for the Release Confirmation P N 003452 Rev E Acoustic Telemetry Modems 5 TelesonarPC 5 43 Send Release Command This command will release the Smart Release with ID 0 To release enter the release code and click SEND To cancel click the CANCEL button T Enter the release code 34 Status Release Code Status Verified Release Confirmation Waiting for Confirmation If the release code is incorrect Invalid Code w
131. e serial interface The data format for the commands is ASCII with 8 bits no parity and 1 stop bit The modem commands are listed in Table 6 1 on page 6 12 Also listed in the table are the page references to where detailed descriptions of the commands are provided NOTE Any reference to a local modem in the table or in the detailed descriptions refers to the modem to which commands and data are input from the host processor over the serial interface Any reference to a remote modem refers to the modem to which acoustic commands are sent and from which data and acknowledgments are received over the acoustic link P N 003452 Rev E Acoustic Telemetry Modems 6 11 If an external PC is used as the host processor commands can be entered from the keyboard and data and messages displayed on the monitor Commands are entered at the command prompt gt and every command must be followed by pressing Enter for the command to be executed To place the modem into Command mode do one of the following Enter rapidly If S Register 15 is set to 00 power down and then power up the modem If S Register 15 is set to 00 wait for the idle time to expire The modem will go into Command mode and display the command prompt gt To enter a command type the command in accordance with the commands listed in Table 6 1 and in the detailed descriptions of the commands that follow 6 Modem Operating Modes and Commands Entering Command
132. e transducer HF 010226 Table 10 3 Acoustic Telemetry Modems Subsea 6000 MODEL NUMBER DESCRIPTION PART NUMBER ATM 887 LF O Deep modem LF omni ATM 887 MF O Deep modem MF omni ATM 887 MF D Deep modem MF directional ATM 887R LF Deep modem remote transducer LF 010665 ATM 887R MF Deep modem remote transducer MF 009562 ATM 887R HF Deep modem remote transducer HF 010666 10 Modem Components and Accessories MODEL NUMBER Table 10 4 Remote Transducers DESCRIPTION BENTHOS PART NUMBER AT 408 LF Omnidirectional transducer LF 2000 m 007744 AT 408 MF Omnidirectional transducer MF 2000 m 008008 AT 408 HF Omnidirectional transducer HF 2000 m 008010 AT 421 LF Directional transducer LF 6000 m 007715 AT 421 MF Directional transducer MF 2000 m 008501 AT 421 MF Deep MODEL NUMBER Deep directional transducer MF 6000 m Table 10 5 OEM Kits DESCRIPTION 008432 PART NUMBER ATM 885PCB LF O ATM 885PCB modem board set LF omni 009552 ATM 885PCB MF O ATM 885PCB modem board set MF omni 009554 ATM 885PCB HF O ATM 885PCB modem board set HF omni 009551 ATM 885PCB MF D ATM 885PCB modem board set MF dir 009553 ATM 885RPCB LF ATM 885RPCB modem board set LF 009266 ATM 885RPCB MF ATM 885RPCB modem board set MF 009665
133. ear Local Data Logger command type ATBC and then press Enter The local modem will clear the contents of its data logger memory While clearing the memory the message 20 Seconds to clear is displayed followed by Buffer Cleared when the memory is cleared Special Considerations When using the Clear Local Data Logger command take note of the following To display the message 20 Seconds to clear and many other messages S Register 13 must be set to either 01 or 02 where 01 is the factory default setting The time required to clear the local modem s data logger memory is approximately 20 seconds While the contents of the local modem s data logger memory are being cleared the local modem will not accept any input over the serial interface or over the acoustic link 6 Modem Operating Modes and Commands Entering Commands 6 66 BENTHOS User s Manual P N 003452 Rev E Acoustic Telemetry Modems 6 67 Local Bytes Stored ATBN Syntax ATBN Enter Definition The Local Bytes Stored command causes the local modem to display the number of bytes of data stored in its data logger memory NOTE For the local modem to execute entered commands the modem must be in Command mode with the command prompt gt displayed If the modem is not in Command mode refer to page 6 11 for instructions on how to place the modem into Command mode How to Use To use the Local Bytes Stored command type ATBN and the
134. easure a modem s performance speed and reliability Speed is measured by determining the number of bits transmitted per second which is referred to as the baud rate Reliability is measured by determining the bit error rate which is the ratio of the number of bits received in error to the total number of bits transmitted Except when noise interference is high modems that transmit and receive data over phone lines or microwave links typically function nearly error free and at baud rates of 128 000 bits sec or more In addition repeater systems allow virtually unlimited transmission ranges Those same performance factors are also used to measure the capabilities of the ATM 880 and ATM 890 Series Acoustic Telemetry Modems However with the transmission medium being water and the transmitted signals being sound a number of physical barriers exist that constrain those performance factors physical barriers that are not present in either wire or microwave links Barriers to Underwater Communications User s Manual The major factors that constrain the performance of any communications system that uses water as a communications medium are the relatively slow speed of sound in water the signal fading characteristics due to sound absorption and destructive interference the multipath interference due to sea surface and sea floor reflections and reflections from nearby objects Sound Speed in Seawater The speed of sound in seawater on avera
135. ed The Advanced Modem Settings dialog box shown in Figure 5 10 on page 5 21 opens 4 In the Frequency Band area select the frequency band 5 Click SET to save the new settings and close the Advanced Modem Settings dialog box and then click Set or the Cancel button in the Remote Modem Configuration dialog box Clicking Set opens a TelesonarPC window which asks whether to store the changes and exit the program If this window opens click OK or the Cancel button Clicking OK exists TelesonarPC Configuring the Remote Modem s Operating Parameters S Registers after Deployment A remote modem s operating parameters can also be configured remotely over the acoustic link after deployment The procedure is similar to that provided for configuring the modem before deployment To configure a remote modem s operating parameters after deployment Configuring the Local and Remote Modems 5 26 BENTHOS 1 Select the address of the remote modem in the Remote ID Status display and then click SET The Local modem goes online with the remote modem 2 Choose Configuration gt Remote Modem The Remote Modem Configuration dialog box shown in Figure 5 12 opens E Remote Modem Configuration Modem Software Version S0 Max Acoustic Receive Baud Rate 59 Modem ID 518 xL Remote Modem ID 514 10 Doppler Correction 51 ERES Acoustic Transmit Baud Rate S4 2400 Bits Sec Transmit Power Level S6 ERES Acoustic Respon
136. eives the Remote Power command AT Pn m it executes the command by setting the transmit power level to level m and then it transmits an acknowledgment at the new transmit power level Transmit information If the command is one that requires that the modem transmit back specific information the modem will transmit the requested information For example if a modem receives the Remote Register command AT Sn it executes the command by transmitting its S Register settings Datalogger Mode When a modem is in Datalogger mode input from its host processor over the serial interface is treated as data which are stored in the flash memory of the modem s data logger Up to 704 kbytes of data can be stored A modem will go into Datalogger mode when it is powered up only if S Register 15 is set to 02 Data stored in the data logger memory are not lost when the modem is P N 003452 Rev E Acoustic Telemetry Modems 6 9 AN powered down The contents of the data logger memory of a remote modem can be read or cleared at any time over the acoustic link The number of bytes of data stored can also be read The same is true for a local modem over the serial interface A modem can be placed into Datalogger mode in any of the following ways Setting S Register 15 to 02 From Command mode only setting S Register 15 to 02 will place the modem into Datalogger mode Using the Lowpower State command ATL S Register 15 set to 02 From Command mode
137. em can be cleared To clear the contents of the data logger memory of the remote modem 1 Choose Datalogger gt Clear Remote Buffer A TelesonarPC window opens asking whether to proceed or cancel Telesonar PC xi This Command Will Permanently Erase All Data Stored In The Remote Buffer Click OK to Proceed or CANCEL to Abort eem 5 TelesonarPC Operating the Modems after Deployment 5 38 BENTHOS 2 Click OK to clear the data logger memory and close the TelesonarPC window or click Cancel to close the window without clearing the data logger memory NOTE To verify that the data logger memory of the remote modem is cleared check the data logger memory by choosing Datalogger gt Check Remote Buffer as described in Checking the Data Logger Memory of the Remote Modem on page 5 35 Capturing Received Data from the Remote Modem When receiving data from a remote modem the data can be captured or saved to a file in real time To capture the received data 1 Choose File Transfer gt Capture The Capture File dialog box shown in Figure 5 15 opens 2 Click the arrow in the Save in drop down list box and select the folder in which to save the data file 3 In the File name text box enter the name of the file in which to save the data Capture File 21x Save in Captured data files ek ja Captured data 1 ja Captured data 2 a Captured data 3 File name Captured data 4
138. emote modem within the acoustic response timeout which is determined by the setting of S Register 7 If an acknowledgment is not received Response Not Received will be displayed To optimize the performance and efficiency of the modems consider reducing the transmit power level of the remote modem with the Remote Power command AT Pn m and use the Multiple Baud Rate Test command to verify a low error rate 8 or less Also consider increasing the remote modem s transmitting acoustic baud rate by changing the setting of its S Register 4 with the Remote Baud Rate command AT An m Again use the Multiple Baud Rate Test command to verify a low error rate Similarly if a high error rate is observed consider increasing the transmit power level or decreasing the transmitting acoustic baud rate or both P N 003452 Rev E Acoustic Telemetry Modems 6 31 Remote Power Syntax AT Pn m Enter Definition The Remote Power command sets the transmit power level of the remote modem at address n to level m The range of settings for m is from 01 to 08 for a range of 0 dB to 21 dB of attenuation in 3 dB steps where 0 dB is the maximum transmit power level and 21 dB is the minimum transmit power level as follows 01 21 dB minimum power level 02 18 dB 03 15 dB 04 12 dB 05 09 dB 06 06 dB 07 03 dB 08 00 dB maximum power level Ca NOTE For the local modem to execute entered commands the modem must b
139. ems 6 29 Multiple Baud Rate Test ATYn Syntax ATYn Enter Definition The Multiple Baud Rate Test command tests the acoustic link between the local modem and the remote modem at address n by causing the remote modem to transmit a 256 byte preset test message multiple times one time for each of the acoustic baud rates listed below Depending on the setting of S Register 12 the preset test message is displayed when received by the local modem If the local modem is an ATM 880 Series Acoustic Telemetry Modem six different acoustic baud rates are used to transmit the preset test message 300 600 800 1000 1200 and 2400 bits sec If the local modem is an ATM 890 Series Acoustic Telemetry Modem these baud rates plus five additional baud rates are used 2560 5120 7680 10 240 and 15 360 bits sec In addition the local modem measures and displays the following which are the received data statistics ERR Errors the number of bits received that did not match the test message CRC Checksum pass or fail where a pass condition signifies no errors were detected and a fail condition signifies one or more bit errors were detected MPD Multipath Delay in milliseconds where the higher the number the greater the multipath The range is from 0 to 50 SNR Signal to Noise Ratio in dB where the higher the value the better the acoustic environment SPD Speed the relative speed in knots between the local and remote modems
140. ent Title shall so pass to the Buyer regardless of any provision for payment of freight or insurance by Benthos and regardless of the form of the shipping documents If shipment is consigned to Benthos it shall be for the purpose of securing the Buyer s obligations under contract Changes Benthos reserves the right to make changes in design or specifications at any time without incurring any obligation to modify previously installed units This manual is provided for informational and reference purpose only and is subject to change without notice P N 003452 Rev E Acoustic Telemetry Modems Preface Congratulations on your purchase of a Benthos Series Acoustic Telemetry Modem The ATM 880 and ATM 890 Series Acoustic Telemetry Modems which employ the latest in digital signal processing technologies are the most advanced underwater modems available They offer a low cost yet reliable and effective alternative to many underwater communications systems This manual provides information on setting up testing and operating the ATM 880 and ATM 890 Series Acoustic Telemetry Modems It is divided into the following ten sections Section 1 Overview reviews the available modem configurations and describes the two advanced modulation techniques used Section 2 Specifications lists the specifications for the modems the modem transducers and the modem battery packs Section 3 Deployment Considerations reviews important installation
141. er to Table 4 6 for the power connector J3 Figure 4 7 ATM 885PCB pinouts The locations of the connectors are and ATM 885RPCB DSP shown in Drawings B875 08659 and Board Serial Connector J4 B875 08693 The drawings are included in Section 9 Drawings Table 4 5 ATM 885PCB and ATM 885RPCB DSP Board Serial Connector J4 Pinouts SIGNAL DIRECTION No Connection Modem to Host Host to Modem RXD RS 232 Receive Host to Modem No Connection TXD RX RS 232 Transmit RS 422 Receive Modem to Host Host to Modem RTS RX Request to Send RS 422 Receive Keyed Pin Common Ground RS 422 Transmit Modem to Host Device Enable See NOTE below Modem to Host RS 422 Transmit Modem to Host 4 Setup and Test Setting Up the Modems 4 12 BENTHOS NOTE The Device Enable output is on when the modem is sending data to the host or if the modem receives the Dial command ATD Refer to Device Enable on page 6 3 for more information Refer also to Section 2 Specifications for the electrical specifications Table 4 6 ATM 885PCB and ATM 885RPCB Power Supply Filter Board Power Connector J3 Pinouts PIN FUNCTION 1 Reserved 2 Ground 3 External Power Input 1 21 28 VDC 4 Ground 5 External Power Input 2 21 28 VDC Perform the steps listed below to connect an ATM 885PCB or ATM 885RPCB to a DC power supply and to a
142. er of bits received that did not match the test message CRC Checksum pass or fail where a pass condition signifies no errors were detected and a fail condition signifies one or more bit errors were detected MPD Multipath Delay in milliseconds where the higher the number the greater the multipath The range is from 0 to 50 SNR Signal to Noise Ratio in dB where the higher the value the better the acoustic environment SPD Speed the relative speed in knots between the local and remote modems where a negative number indicates the modems are moving farther apart and a positive number indicates the modems are moving closer together AGC Automatic Gain Control a decimal number where the lower the number the less gain which means a strong input signal was received Similarly the higher the number the more gain which means a weak input signal was received The lowest gain indication is 00 and the highest is 95 CCERR Corrected Channel Error Metric 0 14 6 Modem Operating Modes and Commands Entering Commands 6 28 User s Manual BENTHOS NOTE For the local modem to execute entered commands the modem must be in Command mode with the command prompt gt displayed If the modem is not in Command mode refer to page 6 11 for instructions on how to place the modem into Command mode How to Use To use the Acoustic Link Test command type ATX followed by the address of the remote modem and
143. ere are two data displays a Terminal display and an Input display The Terminal display displays data and commands that are input to the local modem over the serial interface or received from a remote modem over the acoustic link The Input display displays messages that are to be transmitted from the local modem to the online remote modem These messages can be typed directly from the keyboard of the PC that is running TelesonarPC Viewing of commands in the Terminal display can be enabled or disabled In addition the Terminal display can be cleared at any time Messages viewed in the Input display are typed with Chat mode enabled or disabled When enabled the messages are transmitted only after pressing Enter When disabled the transmission of all characters including backspaces begins after typing has stopped for a period equal to the forwarding delay or after one of the modem s four 4 kbyte transmit buffers is full Refer to Forwarding Delay S8 on page 7 19 for information on the forwarding delay Clearing the terminal display To clear the Terminal display choose File gt Clear Display Enabling and disabling viewing of commands To enable viewing of all commands the Terminal display choose Diagnostic gt View Modem Commands gt Enable To disable viewing choose Disable Enabling and disabling Chat mode To enable Chat mode choose File gt Enable Chat Mode To disable choose Disable Displaying Warning Messages
144. es not illuminate A If AC power is being used to power the deck box verify that the AC power cable is connected to the deck box and is plugged into a 100 120 VAC 50 60 Hz or 200 240 VAC 50 60 Hz power source B If DC power is being used to power the deck box verify that the DC power cable is connected to the deck box and is plugged into a 21 28 VDC power supply C Verify that the AC or DC voltage of the power source is correct D Check the fuse If the fuse is blown replace it with a 4 amp slo blow type E If AC power is being used to power the deck box check the ON OFF circuit breaker rocker switch to see if the circuit breaker has tripped 8 Maintenance and Troubleshooting Troubleshooting 8 8 BENTHOS There is no banner message displayed on the monitor of the host PC connected to a modem when the modem is switched on A Verify that the host PC serial port is configured correctly with the correct baud rate parity number of data bits and number of stop bits Refer to Setting up the Host Processor on page 4 15 B Verify that the terminal program communications software is running C Verify that the verbose level as determined from S Register 13 is set to 01 02 or 03 Refer to Verbose Level S13 on page 7 29 for information on S Register 13 D If the modem has an internal battery pack verify that it has not been depleted E Verify that the RS 232 serial cable is configured correctly and that it is co
145. ew settings and close the Advanced Modem Settings dialog box and then click Set or the Cancel button in the Local Modem Configuration dialog box Configuring the Local and Remote Modems 5 22 User s Manual E Predeployment Configuration 2 Choose Predeployment gt Configure Modem BENTHOS Configuring the Remote Modem s Operating Parameters S Registers before Deployment To configure a remote modem s operating parameters before deployment 1 Connect the remote modem to the PC turn it on and start TelesonarPC The Predeployment Configuration dialog box shown in Figure 5 11 opens Modem Software Version 50 Modem ID 518 Remote Modem ID 514 Doppler Correction 51 Acoustic Transmit Baud Rate S4 Transmit Power Level S6 Acoustic Response Timeout 57 Forwarding Delay S8 IdleTime S10 Test Packet Size S12 Verbose Level S13 Operating Mode 515 Low Power Wakeup 517 Packet Retry Mode 52 L Max Acoustic Receive Baud Rate 59 del 2400 Bits Sec b 3005ec al gt INFINITE i Factory Serial Port Set Figure 5 11 The Predeployment Configuration Dialog Box Advanced Cancel The Predeployment Configuration dialog box is used to configure the remote modem s operating parameters which are controlled by its S Register settings It can also be used to configure the modem s serial comm
146. ex than an omnidirectional or a line array transducer with the same input power level The AT 421 Transducer is most effective when used in the vertical channel or when the transducer can be pointed toward the receiving transducer in the horizontal channel In the latter case multipath due to sea surface and sea floor reflections is minimized as most of the energy is directed horizontally The AT 421 Directional Transducer and its typical vertical beam pattern is shown in Figure 1 7 depicted as LF directional E transducer Mat typical V Figure 1 7 AT 421 Directional Transducer and Beam Pattern Acoustic Baffles An acoustic baffle when installed on a remote transducer effectively reduces the effects of noise or multipath signals that arrive from the back of the transducer Acoustic baffles are available for all the remote transducers Refer to Customer Service on page vi for information on how to contact Benthos for detailed specifications P N 003452 Rev E Acoustic Telemetry Modems 1 11 Typical Applications The ATM 880 and ATM 890 Series Acoustic Telemetry Modems are used in numerous applications Typical uses include remote data acquisition of real time or stored data from subsea instrument packages control of wellhead and pipeline valves and control of autonomous underwater vehicles AUVs Remote Data Acquisition A common application for the ATM 88
147. file over a short deployment causes the transmitter to quickly use a large portion of the modem battery pack capacity while the DSP receiver uses only a small portion To calculate the battery pack capacity usage required to transmit a relatively large data file over a short deployment or to calculate the maximum deployment length for the total amount of data to be transmitted under the same conditions 1 Choose Predeployment gt Battery Capacity The Battery Capacity Calculation dialog box shown in Figure 5 4 opens 2 Select the Calculate Battery Capacity option to calculate the required battery pack capacity usage or select the Calculate Battery Deployment Length option to calculate the maximum deployment length 3 In the Battery Amp Hours area of the Battery Capacity Calculation dialog box select the battery pack used Ifa custom battery pack is used select the Custom option and then enter the capacity in amp hours in the text box 4 Select the acoustic transmit baud rate in bits sec from the Acoustic Baud Rate drop down list box Battery Pack Capacity Usage and Deployment Length 5 12 BENTHOS Battery Capacity Calculation Calculate Battery Calculate Battery Capacity Deployment Length Battery Amp Hours ATM 885 18 A Hr C SR 100 28 A Hr C ATM 887 28 A Hr C Custom Acoustic Baud Rate 1200 v Length of Deplovment 3 Days Basis One Large File Periodic Data Number of By
148. ge is about 1500 meters sec This is compared to electromagnetic signals that are carried on a wire or transmitted as radio signals and travel at nearly the speed of light However the relatively slow speed of sound in seawater has no direct effect on the baud rate of the modems it affects only the time period between the transmission of a signal and its reception In most applications this delay is not of much concern as the alternative is to use a hard wired connection which is sometimes prohibitively expensive or not feasible P N 003452 Rev E Acoustic Telemetry Modems 1 15 Signal Fading Signal fading is primarily caused by spreading loss and the absorption of sound in water but it is also caused by destructive interference due to multipath a situation where signals of like frequency nearly cancel each other This frequency dependent fading occurs when a multipath induced reflection of the transmitted signal arrives at the receiving transducer at the same time as a transmitted signal of the same frequency The result is a reduction in the amplitude of both signals Signal fading due to spreading loss is a result of the dispersion of energy as it radiates outwardly from the transmitting transducer And signal fading due to the absorption of sound in water increases with increasing frequency To a lesser extent environmental factors such as temperature pressure and salinity also affect absorption and absorption also occurs at the se
149. gister command type ATS and the S Register number to be set followed by the equal character and the setting desired and then press Enter The local modem will set the S register setting and respond with the message OK Special Considerations When using the Set Register command take note of the following To display the message OK and many other messages S Register 13 must be set to either 01 or 02 where 01 is the factory default setting If at any time it is desired to return the S Register settings to the values they were when the modem was first powered up and the Write command AT amp W was not used to save the S Register settings as part of the startup configuration power down the modem and then power up the modem again Using the Write command AT amp W after using the Set Register command will save the S Register setting as part of the startup 6 Modem Operating Modes and Commands Entering Commands 6 40 BENTHOS configuration which is the S Register settings when the modem is powered up User s Manual P N 003452 Rev E Acoustic Telemetry Modems 6 41 Write AT amp W Syntax AT amp W Enter Definition The Write command saves the S Register settings of the local modem as the new startup configuration gt NOTE For the local modem to execute entered commands the modem must be in Command mode with the command prompt gt displayed Ifthe modem is not in Command mode refer to page 6 1
150. gt 01200 bits sec OK gt This sets the transmitting acoustic baud rate of the modem to 1200 baud 2 Type AT amp W and then press Enter The command is executed and the command prompt is once again displayed AT amp W Sregisters Stored gt The setting of S Register 4 is now the default setting Therefore whenever the modem is powered up the S4 setting will be 07 P N 003452 Rev E Acoustic Telemetry Modems 4 19 Checking the Acoustic Link between Two Modems in Air To check the acoustic link between two modems in air both modems must be set up with at least one modem connected to a host processor Perform the steps listed below to test the acoustic link between two modems 1 Place the modems or the modem s remote transducers within a foot of each other Be sure no obstacles are between them 2 Turn on the PC and run the terminal program gt NOTE If the modems are being checked for the first time their addresses are both 00 Both modems can have the same address for this test 3 If the ATM 891 is being used as a modem switch the AC ON OFF switch on the front panel to ON or switch on the DC power supply If a subsea modem is being used as a modem switch on the modem by pushing in the switch on the side of the end cap The banner message followed by the command prompt is displayed The message includes the frequency band LF MF HF or Nonstandard the firmware version and the command promp
151. gure 5 9 opens User s Manual P N 003452 Rev E Acoustic Telemetry Modems 5 19 5 TelesonarPC Local Modem Configuration Modem Software Version 50 Max Acoustic Receive Baud Rate 59 Modem ID 518 41 Remote Modem ID 514 a gt Doppler Correction 51 Acoustic Transmit Baud Rate S4 2400 Bits Sec Transmit Power Level S6 ERES Acoustic Response Timeout 57 Forwarding Delay 58 ERES IdleTime 510 Test Packet Size 12 8 Bytes z Verbose Level 513 STANDARD z Operating Mode S15 ON LINE zu Low Power Wakeup S17 ERES Packet Retry Mode 52 gt Factory Reset Serial Port Advanced Figure 5 9 The Local Modem Configuration Dialog Box The Local Modem Configuration dialog box is used to configure the local modem s operating parameters which are controlled by its S Register settings It can also be used to set its frequency band using an advanced setup NOTE For detailed information on the S Registers refer to Table 7 1 on page 7 2 which lists all of the available S Registers and the page references to where detailed descriptions and available settings are provided NOTE In the Local Modem Configuration dialog box buttons arrows and entries in drop down list boxes that are dimmed are not available In addition the entry in the Modem Software Version S0 text box and the Max Acoustic Receive Baud Rate S9 text box cannot
152. he lowpower state Therefore when making this selection be sure hardware RTS CTS handshaking at the host processor is disabled when the modem goes into the lowpower state otherwise the modem will not input data over its serial interface Selecting RTS CTS maintains the driver on even when the modem is in the lowpower state but draws an additional 2 mA of current Make this selection or use software XON OFF handshaking if hardware RTS CTS handshaking cannot be disabled Refer to RS 232 Driver Flow Control S11 on page 7 25 for more information In the Handshaking area select the required handshaking In the Echo area select the Echo ON or Echo OFF option Click CLOSE to close the Serial Port Configuration dialog box Click Set to close the Remote Modem Configuration dialog box and save the changes or click the Cancel button to close the dialog box without saving any changes Configuring the Local and Remote Modems Using Auto Configuration Auto configuration automatically configures both the local and remote modems at the highest acoustic transmit baud rate and the lowest transmit power level that will provide error free communications between the modems Auto configuration ensures reliable operation while using the least amount of battery pack capacity Configuring the Local and Remote Modems 5 30 BENTHOS NOTE Auto configuration will not automatically adjust to changing environmental conditions or changes to the separation
153. he modem that it will go online with in meters in the Acoustic Response Timeout S7 scroll box Select the forwarding delay in seconds in the Forwarding Delay S8 scroll box Select the idle time in seconds or select INFINITE in the Idle Time S10 scroll box In general select INFINITE only for an ATM 891 Deck Box and if it is not being powered by batteries From the Test Packet Size 812 drop down list box select the test packet size in bytes that this modem will command another modem to send when the Acoustic Link Test command ATXn is sent to that Configuring the Local and Remote Modems 5 24 User s Manual 12 13 14 15 16 17 18 BENTHOS modem Refer to Acoustic Link Test ATXn on page 6 27 for information on the ATXn command Select the level of messaging that this modem will provide from the Verbose Level S13 drop down list box Select the operating mode from the Operating Mode S15 drop down list box For this modem to go online with the modem whose address is the setting of Remote Modem ID S14 when this modem is powered up or awakened from the lowpower state select ON LINE Select ON in the Low Power Wakeup S17 scroll box to enable transmission of the lowpower wakeup signal or OFF to disable the lowpower wakeup signal Select OFF if the receiving modem will never be in the lowpower state Select ENABLE in the Packet Retry Mode S2 scroll box to enable
154. ht in water Operating depth BENTHOS Omnidirectional Anodized aluminum 14 0 cm 5 5 in max diameter by 43 8 cm 17 3 in long 18 7 kg 8 5 Ib 5 5 kg 2 5 Ib 2000 m 6560 ft 6000 m 19 680 ft optional AT 421 Directional Transducer The AT 421 is a directional transducer with a built in preamplifier and transmitter It can be used as a dunking transducer with the ATM 891 Deck Box or as a remote transducer with the ATM 885R or ATM 887R Acoustic Telemetry Modem or the ATM 885RPCB Modem Board Set User s Manual Frequency bands Source level 21 V typ Source level 14 V typ Preamp gain Radiation pattern Housing construction Dimensions Weight in air Weight in water 9 14 kHz LF or 16 21 kHz MF 190 dB re 1 uPa 1 m 3 28 ft 187 dB re 1 uPa 1 m 3 28 ft 35 dB 40 conical LF 60 conical MF Anodized aluminum 20 3 cm 8 0 in max diameter by 25 4 cm 10 0 in long LF 14 0 cm 5 5 in max diameter by 43 8 cm 17 3 in long MF 11 8 kg 26 Ib LF 5 5 kg 12 Ib MF 3 6 kg 8 Ib LF 2 5 kg 5 5 Ib MF P N 003452 Rev E Acoustic Telemetry Modems 2 13 Operating depth 6000 m 19 680 ft LF 2000 m 6560 ft 6000 m 19 680 ft optional MF Modem Battery Packs 2 Specifications Two battery packs are available One is specifically used for the ATM 885 and ATM 885R Acoustic Telemetry Modems and the other for the ATM 887 and ATM 887R
155. ial connector that is installed on the bottom end cap The connector is used to input external power for powering the modem instead of using its internal battery pack and to connect to either an RS 232 or an RS 422 serial interface ATM 887 and ATM 887R Acoustic Telemetry Modems The ATM 887 and ATM 887R Acoustic Telemetry Modems are shown in Figure 1 3 The ATM 887 is completely self contained and includes a modem battery pack and a built in directional transducer that is specifically designed for full ocean depth applications The ATM 887 modem functions the same as all the other modems However the housing which is constructed of thick walled hard coat anodized and painted aluminum is designed for P N 003452 Rev E Acoustic Telemetry Modems 1 5 1 Overview En OMNI REMOTE DIRECTIONAL OR TRANSDUCER DIRECTIONAL TRANSDUCER 2 METER CABLE PIGTAIL i OTHER LENGTHS AVAILABLE ATM 885 ATM 885R Figure 1 2 ATM 885 and ATM 885R Acoustic Telemetry Modems deployment to full ocean depth The ATM 887R is similar to the ATM 887 but does not include a transducer or a transmitter Instead a 2 meter cable pigtail is provided which connects from the transducer connector on the top end cap of the modem to an AT 421 remote transducer Both the ATM 887 and the ATM 887R also include a power serial connector that is installed on the bottom end cap The connector is used to i
156. ie 7 17 Forwarding Delay BO 7 19 Coprocessor Board eae 7 21 Idle Time oues don d do k S10 oso o dti Er Rs 7 23 RS 232 Driver Flow Control ac 7 25 ATX Test Message Length 912 nass rien 7 27 Verbose Level SITE ser 7 29 Remote Address STA ba A NY 7 31 xiv BENTHOS Operating Mode SID apad xe RUSO UE 7 33 Error Display SIO 7 35 Lowpower Wakeup hb sse sd eee 7 37 Modem Address S18 sure 7 39 Reserved naar 7 41 Reserved bis ctw aah s a 92D nn ai erf e 7 43 8 Maintenance and Troubleshooting 8 1 General Cleaning and Inspection 8 1 Changing the Modem Battery Packs 8 2 Checking the Modem Battery 8 3 Changing the ATM 885 or ATM 885R Modem Battery Pack 8 3 Changing the ATM 887 or ATM 887R Modem Battery Pack 8 5 Troubleshooting 8 7 9 Drawings A NE ee Surface Modems 9 1 Subsea Modems 9 1 Modem Board Sets 9 1 Remote Transducers
157. igure 1 1 ATM 891 Deck Box Modem and Transducer Configurations 1 4 User s Manual BENTHOS Subsea Modems The subsea modems are ATM 880 Series Acoustic Telemetry Modems and consist of five configurations ATM 885 Acoustic Telemetry Modem Includes a built in omnidirectional or directional transducer and operates to a depth of 2000 m 6560 ft ATM 885R Acoustic Telemetry Modem Connects to a remote transducer and operates to a depth of 2000 m 6560 ft ATM 887 Acoustic Telemetry Modem Includes a built in directional transducer and operates to a depth of 6000 m 19 680 ft ATM 887R Acoustic Telemetry Modem Connects to a remote transducer and operates to a depth of 6000 m 19 680 ft ATM 888 Acoustic Telemetry Modem Includes a built in omnidirectional or directional transducer and operates to a depth of 305 m 1000 ft ATM 885 and ATM 885R Acoustic Telemetry Modems The ATM 885 and ATM 885R Acoustic Telemetry Modems are shown in Figure 1 2 The ATM 885 is completely self contained in a hard coat anodized aluminum housing and includes a modem battery pack and a built in omnidirectional or directional transducer The ATM 885R is similar to the ATM 885 but does not include a transducer or a transmitter Instead a 2 meter cable pigtail is provided which connects from the transducer connector on the top end cap of the modem to any of the remote transducers Both the ATM 885 and the ATM 885R also include a power ser
158. ill be displayed for the Release Code Status and Aborted will be displayed for Release Confirmation If the correct release code was received the Release Confirmation window should open which acknowledges that the release mechanism has been activated and that the SMART Release has released itself from its mooring Release Confirmation xi lt 3 Smart Release has been Released Use the Auto range command to check the range If instead a Warning window opens indicating that the release mechanism has been activated but not confirmed then the release has not released itself from its mooring In this case click OK to close the Warning window and then again click Send in the Send Release Command dialog box which remains open 5 If the Release Confirmation window opens click OK The Send Release Command dialog box closes and the Automatic Ranger window opens to assist in relocating the release as it ascends to the surface Operating a SMART Release 5 44 BENTHOS c Automatic Ranger 6 To end auto ranging and close the Automatic Ranger window click Halt and then Close Modem Diagnostics User s Manual TelesonarPC provides several diagnostic functions which help to evaluate modem performance These diagnostic functions allow viewing the local and remote modem battery pack voltages viewing the background noise detected by the local modem s receiver and commanding the local modem to ping continuously
159. is functioning properly NOTE For the local modem to execute entered commands the modem must be in Command mode with the command prompt gt displayed If the modem is not in Command mode refer to page 6 11 for instructions on how to place the modem into Command mode How to Use To use the Attention command type AT and then press Enter The local modem will indicate that it has verified communications with its host processor by responding with the message OK and displaying the command prompt gt Special Considerations To display the message OK and many other messages S Register 13 must be set to either 01 or 02 where 01 is the factory default setting 6 Modem Operating Modes and Commands Entering Commands 6 18 BENTHOS User s Manual P N 003452 Rev E Acoustic Telemetry Modems 6 19 ATDn Syntax ATDn Enter Definition The Dial command causes the local modem to go into Online mode from Command mode and to go online with the remote modem at address n NOTE For the local modem to execute entered commands the modem must be in Command mode with the command prompt gt displayed If the modem is not in Command mode refer to page 6 11 for instructions on how to place the modem into Command mode How to Use To use the Dial command type ATD followed by the address of the remote modem and then press Enter The local modem will go online with the remote modem and then the local mo
160. is capability by allowing commands to be transmitted to an AUV Furthermore since the modems provide two way communications capability AUV position and status information as well as other data can be received from the AUV An example of this application is shown in Figure 1 10 In this example the modems provide the communications link between an under ice AUV and a surface ATM 891 DECK BOX INSIDE SURFACE STATION DN AS AT 408 OMNIDIRECTIONAL TRANSDUCER A Y oy LES i AUV WITH AT 408 OMNIDIRECTIONAL TRANSDUCER AND ATM 880 MODULE Figure 1 10 Command and Control of an AUV station The AT 408 Omnidirectional Transducers used in this example provide a reliable acoustic link between the AUV and the surface station regardless of what depth or from what direction the AUV is located An ATM 891 Deck Box connected to a host processor is used in the surface station and an ATM 880 Module and host processor is used aboard the AUV Typical Applications 1 14 BENTHOS Modem Performance Factors The primary function of modems is to both transmit and receive signals that represent digital data binary ones and zeros over what usually is a hard wired link such as a telephone line or a microwave link In fact the word modem is derived from the terms modulation and demodulation which refer to the coding and transmission and the receiving and decoding of digital data respectively Two key factors m
161. ister settings of the remote modem with address 1 were displayed by entering AT S1 Special Considerations When using the Read Remote Registers command take note of the following The local modem must receive an acknowledgment from the remote modem within the acoustic response timeout which is determined by the setting of S Register 7 If an acknowledgment is not received Response Not Received will be displayed The S Register settings can be interpreted from Table 7 1 on page 7 2 which includes page references to where detailed descriptions are provided 6 Modem Operating Modes and Commands Entering Commands 6 38 BENTHOS gt AT S1 Remote Registers S00 041 S01 001 S02 000 S03 002 S04 005 S05 000 S06 008 S07 015 S08 060 S09 000 S10 255 S11 000 S12 000 S13 003 S14 000 S15 000 S16 000 S17 001 S18 001 S19 000 S20 000 gt Figure 6 3 Read Remote Registers Command and Resulting Display User s Manual P N 003452 Rev E Acoustic Telemetry Modems 6 39 Set Register ATSn n Syntax ATSn n Enter Definition The Set Register command sets the local modem s S Register number n to the value entered following NOTE For the local modem to execute entered commands the modem must be in Command mode with the command prompt gt displayed If the modem is not in Command mode refer to page 6 11 for instructions on how to place the modem into Command mode How to Use To use the Set Re
162. it recognizes the signal as containing a valid address it will go out of the lowpower state and into the operating mode determined by the setting of S Register 15 6 Modem Operating Modes and Commands Operating Modes 6 8 User s Manual BENTHOS NOTE When a modem is not being powered by batteries typically for the ATM 891 Deck Box the idle time should be set to prevent the modem from going into the lowpower state for an indefinite time This improves operating efficiency as the modem never has to be reawakened from its lowpower state The idle time can be set to indefinite by setting S Register 10 to 255 Acoustic Command Execution When a modem receives a command over the acoustic link it will respond in one of the following ways Go into one of two of the operating modes If the command is the Dial command ATDn then the modem will go into Online mode if it is the Remote Data Logger Disable command AT BDn and the modem is in Datalogger mode then also Online mode if it is the Remote Data Logger Enable command AT BEn then Datalogger mode Go into the lowpower state If the command is the Hang Up command ATH the modem will go into the lowpower state without transmitting an acknowledgment Transmit an acknowledgment If the command is one that does not require that the modem transmit back specific information the modem will execute the command and transmit an acknowledgment For example if a modem rec
163. itch all the way out Refer to Figure 4 4 on page 4 6 for the location of the modem on off switch 2 For an ATM 885 Acoustic Telemetry Modem only use a 5 32 Allen wrench to remove the four socket head screws and four washers that attach the transducer guard to the housing clamp and remove the guard 8 Maintenance and Troubleshooting Changing the Modem Battery Packs 8 4 User s Manual 10 11 12 13 BENTHOS With the modem on its side and resting on a flat surface use a 9 64 Allen wrench to remove the three socket head screws that attach the POWERY SERIAL connector end cap to the housing Carefully pull the end cap straight out from the housing If required rotate the end cap slightly while pulling Disconnect the in line connector that connects the battery pack to the connector on the POWER SERIAL connector end cap Using a 9 64 Allen wrench remove the three socket head screws that attach the transducer end cap for an ATM 885 Acoustic Telemetry Modem or the remote transducer connector end cap for an ATM 885R Acoustic Telemetry Modem Carefully pull the end cap straight out from the housing If required rotate the end cap slightly while pulling When clear of the housing continue to pull the end cap out while pushing on the battery pack from the other end of the housing Pull the end cap out far enough to access the 5 pin power connector on the top of the circuit board Disconnect the 5 pin
164. itting One Large File The Battery Capacity Calculation Dialog Box Set up for Calculating Battery Pack Usage when Transmitting Data Periodically 1 3 1 5 1 6 1 8 Figure 5 6 Figure 5 7 Figure 5 8 Figure 5 9 Figure 5 10 Figure 5 11 Figure 5 12 Figure 5 13 Figure 5 14 Figure 5 15 Figure 5 16 Figure 5 17 Figure 5 18 Figure 6 1 Figure 6 2 Figure 6 3 User s Manual BENTHOS The PC Configuration Dialog Box 5 16 The Range Options Dialog 5 17 The Relative Speed Units Dialog Box 5 18 The Local Modem Configuration Dialog Box 5 19 The Advanced Modem Settings Dialog Box 5 21 The Predeployment Configuration Dialog Box 5 22 The Remote Modem Configuration Dialog Box 5 26 The Serial Port Configuration Dialog Box 5 28 The DataLogger File Dialog Box 5 37 The Capture File Dialog Box 5 38 The Open File to Upload Dialog Box 5 39 The Noise Test 5 45 The Ping Test Dialog Box 5 46 Conditions for Recognizing an Online Interrupt Command aa aan 6 16 Read Register Command and Resulting Display 6 36 Read Remote Registers Command and Resulting DISDIAY at wine Sag ee a 6 38 P N 003452 Rev E Acoustic Telemetry Modems Table 4 1 Table 4 2 Table 4 3 Table 4 4 Table 4 5 Tab
165. lable Settings How to select the baud rate both when using TelesonarPC and directly by using modem commands is explained later in this manual User s Manual P N 003452 Rev E Acoustic Telemetry Modems 1 17 Convolutional Coding Convolutional coding is the most effective of the thee methods provided for increasing reliability The convolutional coding method used is 1 2 rate convolutional coding In 1 2 rate convolutional coding every eight data bits are followed by eight additional bits which are encoded from the data bits using a convolutional encoding algorithm This convolutional code when decoded by the receiving modem using a Viterbi decoding algorithm is used to correct at least one error bit if there are any in the eight bits of data The effective baud rate or throughput however is reduced by half since for every 16 bits transmitted only eight are data bits Multipath Guard Period To further increase reliability especially in high multipath situations where signal overlap can occur a selectable delay can be inserted between data frames The delay is selected based on the length of time the multipath is present in the communications channel Again the baud rate is affected Multipath guard period is not used with the PSK modulation technique For example a multipath guard period of 25 milliseconds adds 25 milliseconds to the duration of each data frame which is also 25 milliseconds hence the baud
166. lculation the Battery Calculation window opens with the maximum number of days displayed for the type of battery pack selected 11 Click OK in the Battery Calculation window and then click the Cancel button in the Battery Pack Calculation dialog box to close it Transmitting Relatively Small Data Files Periodically Long Deployment Transmitting relatively small data files periodically over a long deployment causes the DSP receiver to use a large portion of the modem battery pack capacity while the transmitter uses only a small portion To calculate the battery pack capacity usage required to transmit relatively small data files over a long deployment or to calculate the maximum deployment length for the total amount of data to be transmitted under the same conditions 1 Choose Predeployment gt Battery Capacity The Battery Capacity Calculation dialog box shown in Figure 5 5 opens 2 Select the Calculate Battery Capacity option to calculate the required battery pack capacity usage or select the Calculate Battery Deployment Length option to calculate the maximum deployment length 3 In the Battery Amp Hours area of the Battery Capacity Calculation dialog box select the battery pack used If a custom battery pack is used select the Custom option and then enter the capacity in amp hours in the text box 4 Select the acoustic transmit baud rate in bits sec from the Acoustic Baud Rate drop down list box Battery Pack Capaci
167. le 4 6 Table 4 7 Table 4 8 Table 4 9 Table 6 1 Table 7 1 Table 8 1 Table 10 1 Table 10 2 Table 10 3 Table 10 4 Table 10 5 Table 10 6 List of Tables ATM 891 SERIAL I O Connector Pinouts ATM 891 SERIAL I O Connector to DB 9 Pin to Pin Connections Subsea Modem POWER SERIAL Connector Pinouts Subsea Modem POWER SERIAL Connector to DB 9 Pin to Pin Connections ATM 885PCB and ATM 885RPCB DSP Board Serial Connector J4 Pinouts ATM 885PCB and ATM 885RPCB Power Supply Filter Board Power Connector J3 Pinouts ATM 885PCB and ATM 885RPCB DSP Board Serial Connector J4 to DB 9 Pin to Pin Connections ATM 885PCB Transducer Cable Wiring ATM 885RPCB Bulkhead Connector Wiring ATM 880 and ATM 890 Series Acoustic Telemetry Modem Command Set ATM 880 and ATM 890 Series Acoustic Telemetry Modem S Registers Modem Battery Pack Capacity vs Voltage Acoustic Telemetry Modems Surface Acoustic Telemetry Modems Subsea 2000 m Acoustic Telemetry Modems Subsea 6000 m Remote Transducers xvii Acoustic Telemetry Modems 1 1 1 Overview The Benthos acoustic telemetry modems include the Benthos ATM 880 and ATM 890 Series Acoustic Telemetry Modems and the Smart Modem Acoustic Release Technology SMART Releases along with remote transducers circuit board sets software and other products in the Benthos Telesonar product line The Benthos ATM 880 and ATM 890 Series Acoustic Telemetry Modems and the SMART Re
168. le Time S10 scroll box In general select INFINITE only for an ATM 891 Deck Box and if it is not being powered by batteries From the Test Packet Size S12 drop down list box select the test packet size in bytes that this modem will command another modem to send when the Acoustic Link Test command ATXn is sent to that modem Refer to Acoustic Link Test ATXn on page 6 27 for information on the ATXn command Select the level of messaging that this modem will provide from the Verbose Level S13 drop down list box Select the operating mode from the Operating Mode S15 drop down list box For this modem to go online with the modem whose address is the setting of Remote Modem ID S14 when this modem is powered up or awakened from the lowpower state select ON LINE Select ON in the Low Power Wakeup S17 scroll box to enable transmission of the lowpower wakeup signal or OFF to disable the lowpower wakeup signal Select OFF if the receiving modem will never be in the lowpower state Select ENABLE in the Packet Retry Mode S2 scroll box to enable packet retry or DISABLE to disable packet retry Click Set to output the new settings to the modem and close the Remote Modem Configuration dialog box Configuring the Local and Remote Modems 5 28 BENTHOS Configuring the Remote Modem s Serial Communications Port after Deployment A remote modem s serial communications port can also be configured remotely over the
169. leases provide reliable wireless digital communications between deployed underwater instrument packages and surface or subsea platforms The SMART Release is included in the ATM 880 Series which can transmit data at baud rates as high as 15 360 bits sec and receive data at baud rates as high as 2400 bits sec The ATM 890 Series can both transmit and receive at baud rates as high as 15 360 bits sec NOTE Telesonar is derived from the words telemetry and sonar where telemetry is data transmission and the word sonar a general term for the applications of underwater sound was derived many years ago from the acronym for sound navigation and ranging Benthos manufactures and markets the ATM 880 and ATM 890 Series Acoustic Telemetry Modems worldwide under the Telesonar product line name The Telesonar product line also includes TelesonarPC a Windows based software program that provides a user friendly means of configuring and operating the modems Applications for the ATM 880 and ATM 890 Series Acoustic Telemetry Modems include remote monitoring of oceanographic sensors control of wellhead and pipeline valves and control of autonomous underwater vehicles AUVs The ATM 880 and ATM 890 Series Acoustic Telemetry Modems are the most advanced the most multipath and noise tolerant and the most cost efficient ever available They are designed to meet both the high data rate requirements of commercial users and the higher reliability lower data
170. memory Special Considerations When using the Read Remote Data Logger command take note of the following The local modem must receive an acknowledgment from the remote modem within the acoustic response timeout which is determined by the setting of S Register 7 If an acknowledgment is not received Response Not Received will be displayed The contents of the remote modem s data logger memory are transmitted at the baud rate set by S Register 4 of the remote modem If the 704 kbyte data logger memory is full downloading its contents at a baud rate of 1200 bits second will take a minimum of 1 3 hours Slower baud rates will increase the time 6 Modem Operating Modes and Commands Entering Commands 6 58 User s Manual BENTHOS While the contents of the remote modem s data logger memory are being transmitted communications with or between other remote modems is not possible While the contents of the remote modem s data logger memory are being transmitted the remote modem will not accept any input over the serial interface or over the acoustic link The capacity of the remote modem s battery pack must be sufficient to transmit the contents of the remote modem s data logger memory Refer to Modem Battery Pack Capacity Calculations on page 3 3 for information on how to calculate the required modem battery pack capacity NOTE The remote modem can also be recovered and the contents of its data logger memory do
171. mple an ATM 885R Acoustic Telemetry Modem will be used during a short deployment in a 21 C environment to transmit 3 Mbytes of data at 1200 bits sec Since the transmitter active current is 1 A the capacity requirement of the modem battery pack is Amp hours 3 Mbytes 1 A 1200 bits sec x 450 5 6 Ah Referring to Modem Battery Packs on page 2 13 it can be seen that a modem battery pack for an ATM 885R Acoustic Telemetry Modem is more than adequate 3 Deployment Considerations Modem Battery Pack 3 4 User s Manual BENTHOS An Example Deployment Calculation The example below shows how to calculate the number of deployment days an ATM 885R Acoustic Telemetry modem can operate when it is required to transmit 500 bytes of data every 30 minutes and the modem is powered with a modem battery pack The deployment conditions are the following Baud rate 600 bits sec Temperature 0 C Modem battery pack capacity 18 Ah Transmitter current active 1A DSP receiver current active 25 mA Lowpower state current 0 5 mA The capacity of a modem battery pack is reduced by approximately 25 when exposed to a 0 C environment Hence the capacity of an 18 Ah modem battery pack is reduced by 25 from 18 A h to 13 5 A h and a 28 A h modem battery pack provides 21 A h at 0 C The calculation of the number of deployment days at the required transmission rate of 500 bytes every 30 minutes is performed as follows First calculate
172. mputers 3 Refer to Table 4 3 and connect the DC power and ground pins to the DC power supply if one is used Table 4 4 Subsea Modem POWER SERIAL Connector to DB 9 Pin to Pin Connections SUBSEA MODEM HOST PC DB 9 POWER SERIAL SIGNAL CONNECTOR CONNECTOR DIRECTION LABEL FUNCTION LABEL FUNCTION 3 GND Common Ground 5 GND Ground 6 RTS Dea to Modem toHost 8 CTS Clear to Send 8 RXD Receive Host to Modem 3 TXD Transmit 9 TXD Transmit Modem to Host 2 RXD Receive Transducer Connections For an ATM 885R or ATM 887R Acoustic Telemetry Modem connect the transducer cable purchased separately to the TRANSDUCER connector on the modem and to the bulkhead connector on the remote transducer P N 003452 Rev E Acoustic Telemetry Modems 4 11 Setting up the Modem Board Sets The ATM 885PCB and ATM 885RPCB Board Sets are set up with all the connections made directly to the boards Power and Serial Interface Connections The power and serial interface connections RS 232 or RS 422 are made with separate connectors on both the ATM 885PCB and ATM 885RPCB Board Sets When connecting an ATM 885PCB or an ATM 885RPCB to a PC orto an instrument power is connected to J3 of the Power Supply Filter Board and the serial interface connection is made to J4 ofthe DSP Board Refer to Figure 4 7 for the DSP Board serial connector J4 pin orientation and to Table 4 5 for the pinout information Ref
173. n Any changes made to the S Register settings can be saved as the new startup configuration with the Write command AT amp W and the changed settings become the new default settings In addition the S Registers can be set to their original factory default startup configuration at any time with the Factory Reset command AT amp F To place the modem into Command mode do one of the following Enter rapidly If S Register 15 is set to 00 power down and then power up the modem If S Register 15 is set to 00 wait for the idle time to expire The modem will go into Command mode and display the command prompt gt To make the S Register setting type ATS and the S Register number to be set followed by the equal character and the setting desired and then press Enter 7 Modem Operating Parameters S Registers 7 2 BENTHOS Table 7 1 ATM 880 and ATM 890 Series Acoustic Telemetry Modem S Register S Registers Name Factory Default Setting SO Software Version Number Doppler Tracking lt Version gt Packet Retry Serial Baud Rate Acoustic Baud Rate Reserved Transmit Power Level Acoustic Response Timeout Forwarding Delay Coprocessor Board Idle Time RS 232 Driver Flow Control ATX Test Message Length Verbose Level Remote Address Operating Mode Error Display Lowpower Wakeup Modem Address Reserved
174. n any one of two different frequency bands The remote transducers each include a built in preamplifier and transmitter P N 003452 Rev E Acoustic Telemetry Modems 1 9 1 Overview AT 408 Omnidirectional Transducer The AT 408 Omnidirectional Transducer is available in three frequency bands 9 14 kHz LF 16 21 kHz MF and 25 30 kHz HF The AT 408 Omnidirectional Transducer provides omnidirectional transmit and receive beam patterns It is best used in both deep and shallow water applications where the direction of the receiving transducer is not known or is not fixed However because of its omnidirectional beam pattern the directivity index is relatively small and the multipath is more severe than a directional transducer with the same input power level as the energy is more widely distributed The AT 408 Omnidirectional Transducer and its typical vertical beam pattern is shown in Figure 1 6 Figure 1 6 AT 408 Omnidirectional Transducer and Beam Pattern AT 421 Directional Transducer The AT 421 Directional Transducer is available in two frequency bands 9 14 kHz LF and 16 21 kHz MF Whenever possible the AT 421 Directional Transducer should be used as it provides conical transmit and receive beam patterns And because the energy is focused into a narrow Modem and Transducer Configurations 1 10 User s Manual BENTHOS beam it provides a higher directivity ind
175. n instrument or PC WARNING Pin 5 is NOT protected against reverse polarity DO NOT connect Pin 5 to the negative of the DC power supply as damage to the modem will occur If reverse polarity protection is required connect Pin 3 to the DC power supply positive instead as described below for Step 4 1 Refer to Table 4 6 and connect Pin 5 to the DC power supply positive through a 6 Amp inline fuse 2 Connect Pin 4 to the DC power supply negative 3 If connecting the ATM 885PCB or ATM 885RPCB to an instrument refer to Table 4 5 on page 4 11 and connect the pins listed to the RS 232 or RS 422 interface of the instrument If connecting the ATM 885PCB or ATM 885RPCB to a PC refer to Table 4 7 and connect the pins listed to an available serial COM port on the PC If required continue with the steps listed below to connect a second DC power supply as a backup or if reverse polarity protection is required when connecting a single supply User s Manual P N 003452 Rev E Acoustic Telemetry Modems 4 13 NOTE Pin 3 is diode protected against reverse polarity Connect Pin 3 to the DC power supply positive when reverse polarity protection is required Some power loss will result due to the power dissipation across the diode 4 Refer to Table 4 6 and connect Pin 3 to the DC power supply positive through a 6 Amp inline fuse 5 Connect Pin 2 to the DC power supply negative Table 4 7 ATM 885PCB and ATM 885RPCB DSP Board Seri
176. n press Enter The local modem will display the number of bytes of data stored in its data logger memory 6 Modem Operating Modes and Commands Entering Commands 6 68 BENTHOS User s Manual P N 003452 Rev E Acoustic Telemetry Modems 6 69 Output Local Data Logger ATBT Syntax ATBT Enter Definition The Output Local Data Logger command causes the local modem to output the contents of its data logger memory over the serial interface NOTE For the local modem to execute entered commands the modem must be in Command mode with the command prompt gt displayed If the modem is not in Command mode refer to page 6 11 for instructions on how to place the modem into Command mode How to Use To use the Output Local Data Logger command type ATBT The local modem will output the contents of its data logger memory over the serial interface Special Considerations When using the Output Local Data Logger command take note of the following The contents of the local modem s data logger memory do not change when it is output over the serial interface While the contents of the local modem s data logger memory are being output the local modem will not accept any input over the serial interface or over the acoustic link 6 Modem Operating Modes and Commands Entering Commands 6 70 BENTHOS User s Manual P N 003452 Rev E Acoustic Telemetry Modems 6 71 Output Local Page ATBPn Syntax ATBPn Enter
177. n the local and remote modems and many others When a command is entered the modem will indicate the execution of the command with a message and then display the command prompt gt A modem can be placed into Command mode in any of the following ways Using the Online Interrupt command Entering the Online Interrupt command will place the modem into Command mode Refer to Online Interrupt on page 6 15 for information on the Online Interrupt command Cycling power S Register 15 set to 00 If S Register 15 is set to 00 powering down the modem and then powering up the modem will place the modem into Command mode Allowing the idle time to expire S Register 15 set to 00 If S Register 15 is set to 00 allowing the idle time to expire will place the modem into Command mode and into the lowpower state Refer to Lowpower State below for information on the lowpower state and the idle time P N 003452 Rev E Acoustic Telemetry Modems 6 7 Lowpower State In any of the operating modes when there is no input to the modem either from its host processor over the serial interface or from a remote modem over the acoustic link the modem will go into the lowpower state after a preset time The lowpower state conserves battery power as only the modem s receiver is active The preset time is the idle time and is determined by the setting of S Register 10 When the modem goes into the lowpower state the message Lowpower is dis
178. nd the procedures for disassembling the ATM 885 and ATM 885R Acoustic Telemetry Modems are different than those for the ATM 887 and ATM 887R Acoustic Telemetry Modems User s Manual P N 003452 Rev E Acoustic Telemetry Modems 8 3 Checking the Modem Battery Pack The capacity of the modem battery pack can be estimated by measuring the battery pack voltage either open circuited or under load A more meaningful measurement however is obtained when the battery pack is under load To check the modem battery pack after removing it from a modem connect a 150 ohm 3 watt resistor across the battery pack terminals measure the voltage across the load resistor with a digital multimeter and refer to Table 8 1 to determine the battery pack capacity Table 8 1 Modem Battery Pack Capacity vs Voltage Voltage Under 150 Ohm Load volts 20 100 18 95 17 75 16 50 15 25 14 10 13 1 Capacity Remaining Changing the ATM 885 or ATM 885R Modem Battery Pack For either the ATM 885 or the ATM 885R Acoustic Telemetry Modem both end caps require removal when changing the modem battery pack First the POWER SERIAL connector end cap must be removed and then the transducer end cap for an ATM 885 Acoustic Telemetry Modem or the remote transducer connector end cap for an ATM 885R Acoustic Telemetry Modem To change the modem battery pack for an ATM 885 or ATM 885R 1 Turn the modem off by pulling the on off sw
179. ndow verify the address of the remote modem If the address is wrong select the correct address using the left or right arrow in the Remote ID scroll box and then click RETRY If the address is correct try changing the transmit power level using the left or right arrow in the Local Power scroll box and then click RETRY If the address of the remote modem is not known click SEARCH to have TelesonarPC find a remote modem If there is no remote modem the Main window can be accessed and the Remote Modem dialog box closed by clicking IGNORE However some of the items on the Menu bar will be dimmed and therefore unavailable Checking the TelesonarPC Version Number To check the TelesonarPC version number choose Help gt About The About TelesonarPC window opens with the version number displayed Exiting TelesonarPC To exit TelesonarPC 1 Select File from the Menu bar in the Main window The File menu opens 2 Choose Exit P N 003452 Rev E Acoustic Telemetry Modems 5 5 Uninstalling TelesonarPC To uninstall TelesonarPC 1 Exit from TelesonarPC 2 Select Start gt Settings gt Control Panel to open the Control Panel 3 Choose Add Remove Programs in the Control Panel The Add Remove Programs Properties dialog box opens Install Uninstall Windows Setup Startup Disk install new program from a floppy disk or CD ROM drive click Install Install 72 The following software can be automa
180. nge of settings for S Register 15 is from 00 to 02 as listed below 00 Command mode 01 Online mode 02 Datalogger mode 7 Modem Operating Parameters S Registers 7 34 BENTHOS User s Manual P N 003452 Rev E Acoustic Telemetry Modems 7 35 Error Display 16 Default Setting 01 Data packets containing errors are not displayed Definition The setting of S Register 16 determines whether data packets that contain errors are displayed Available Settings There are two available settings for S Register 16 as listed below 00 Data packets containing errors are displayed 01 Data packets containing errors are not displayed 7 Modem Operating Parameters S Registers 7 36 BENTHOS User s Manual P N 003452 Rev E Acoustic Telemetry Modems 7 37 Lowpower Wakeup 17 Default Setting 01 The lowpower wakeup signal is transmitted at the beginning of every data packet Definition The setting of S Register 17 enables or disables transmission of the lowpower wakeup signal at the beginning of every data packet The lowpower wakeup signal is a 375 ms long signal that wakes up all the remote modems that are in the lowpower state Available Settings There are two available settings for S Register 15 as listed below 00 Disables the lowpower wakeup signal 01 Enables the lowpower wakeup signal Special Considerations When setting S Register 17 take note of the following The lowpower wakeup signal should b
181. nnected to the correct serial port on the host PC Refer to Setting Up the Modems on page 4 7 The monitor of the host PC connected to a subsea modem displays the banner message when the modem is switched on but there is no displayed response to commands entered from the keyboard of the host PC A Verify that the terminal program communications software echo feature if it has one is turned on B If the terminal program communications software does not have an echo feature enter the Read Register command ATSn where n is 3 to verify that the baud rate selection as determined by the setting of S Register 3 is one with echo on Refer to Serial Baud Rate S3 on page 7 9 for information on S Register 3 There is serial communications with the local modem but no transmissions can be heard from the local modem after entering a command that requires the modem to transmit an acoustic command A If the ATM 891 Deck Box is the local modem increase the volume setting using the VOLUME control B If the local modem is an ATM 891 Deck Box or an ATM 885R or ATM 887R Acoustic Telemetry Modem check the transducer connections User s Manual P N 003452 Rev E Acoustic Telemetry Modems 8 9 C Verify that the verbose level as determined from S Register 13 is set to 01 02 or 03 Refer to Verbose Level S13 on page 7 29 for information on S Register 13 With the verbose level set to 01 or higher errors if any will be dis
182. nology provided by the Benthos ATM 880 Series Acoustic Telemetry Modems It is completely self contained in a hard coat anodized aluminum housing and includes a modem battery pack and a built in omnidirectional transducer that is specifically designed for full ocean depth applications NOTE For detailed information on the Benthos SR 100 SMART Release refer to the SR 100 SMART Release User Manual P N 003452 Rev E Acoustic Telemetry Modems 1 7 The SR 100 is designed for long range heavy duty deep or shallow water applications It can supporta static load of 4540 kg 10 000 Ib and each release is factory tested to a simulated depth of 11 000 m 36 080 ft Its primary function is the release of a moored instrument array In addition the SR 100 functions to assist in the relocation of itself and the instrument array as it can be commanded to operate as a transponder for measuring slant range Upon recovery the SR 100 can be easily re armed and redeployed Modem Board Sets The modem board sets are ATM 880 Series Acoustic Telemetry Modems and consist of two configurations ATM 885PCB Modem Board es Set Includes a directional or Figure 1 4 The SR 100 SMART omnidirectional transducer Release ATM 885RPCB Modem Board Set Connects to a remote transducer ATM 885PCB Modem Board Set The ATM 885PCB Modem Board Set is shown in Figure 1 5 The ATM 885PCB includes a ci
183. nput external power for powering the modem instead of using its internal battery pack and to connect to either an RS 232 or an RS 422 serial interface ATM 888 Acoustic Telemetry Modem The ATM 888 Acoustic Telemetry Modem which is externally powered only is contained in a PVC housing and includes a built in omnidirectional or directional transducer The ATM 888 also includes a power serial connector that is installed on the bottom end cap The connector is used to input external power for powering the modem and to connect to either an RS 232 or an RS 422 serial interface Modem and Transducer Configurations 1 6 User s Manual BENTHOS 421 TRANSDUCER MF BUILT IN p DIRECTIONAL TRANSDUCER 2 S CABLE PIGTAIL ATM 887 ATM 887R OTHER LENGTHS AVAILABLE Figure 1 3 ATM 887 and ATM 887R Acoustic Telemetry Modems SMART Releases The SMART Releases include the following SR 100 SMART Release Designed for long range heavy duty applications and operates to a depth of 6000 m 19 680 ft SR 100 SMART Release The SR 100 SMART Release is shown in Figure 1 4 The SR 100 combines the same reliable high torque motorized release mechanism used in the Benthos 865 A Deep Sea Acoustic Release with the same modem tech
184. o Acoustic Link Test ATXn on page 6 27 for information on the ATXn command Select the level of messaging that this modem will provide from the Verbose Level S13 drop down list box Select ENABLE in the Packet Retry Mode S2 scroll box to enable packet retry or DISABLE to disable packet retry Click Set to output the new settings to the modem and close the Local Modem Configuration dialog box P N 003452 Rev E Acoustic Telemetry Modems 5 21 AN 5 TelesonarPC Advanced Local Modem Settings The advanced local modem settings determine the local modem s frequency band Typically this setting is made at the factory and does not require changing However it can be changed if necessary WARNING Changing the frequency band may degrade performance To ensure optimum performance verify that the new setting matches the frequency band LF MF or HF of the modem or the modem and its remote transducer To change the local modem s frequency band 1 Choose Configuration gt Local Modem The Local Modem Configuration dialog box shown in Figure 5 9 on page 5 19 opens Click Advanced The Advanced Modem Settings dialog box shown in Figure 5 10 opens Advanced Modem Settings xi r Frequency Band MF 25 30 kHz C MF 16 21 kHz C LF 9 14 kHz Non Standard Figure 5 10 The Advanced Modem Settings Dialog Box 3 In the Frequency Band area select the frequency band Click SET to save the n
185. o another reference a recommendation to check that certain criteria are met before proceeding further in a step or sequence or general information applicable to the setup and operation of the ATM 880 Series Acoustic Telemetry Modems U WARNING A reminder that dangerous or damaging conseguences could result if certain recommended procedures are not followed Customer Service We welcome your comments and suggestions for improving our products and documentation as well as developing better ways of serving you with acoustic technology Therefore please contact Customer Service should you have any comments or suggestions about this manual or the ATM 880 and ATM 890 Series Acoustic Telemetry Modems or if you require service or support Please contact us at BENTHOS INC Attention Customer Service 49 Edgerton Drive North Falmouth MA 02556 U S A Telephone 508 563 1000 Fax 508 563 6444 E mail info benthos com www benthos com This manual is available online at http ftp benthos com modem manual User s Manual P N 003452 Rev E Acoustic Telemetry Modems vii Contents Notices One et eee CE M a scd ee ii Proprietary Information 00 0c eee e eee eee eee ee ees ii Warranty cok foie k erneute ii Liability a oso e e A iii E gm iv CHANGES cbe AO A dubi wai LU E ba aan iv Preface x a wie ih QR dal a ea Rd Notes and Warnings
186. o the circuit board and secure it with the locking sleeve Connect the 5 pin serial connector to the circuit board Use a wire tie to secure the wire harness to the wire tie block Slide the chassis and the battery pack together into the housing and then press the end cap into the housing being careful not to pinch the wires Line up the three holes in the end cap with the three holes in the housing and secure the end cap to the housing with the three hex head Screws Connect the in line connector that connects the modem battery pack to the connector on the POWER SERIAL connector end cap and then press the end cap into the housing being careful not to pinch the wires Line up the three holes in the end cap with the three holes in the housing and secure the end cap to the housing with the three hex head Screws For an ATM 885 Acoustic Telemetry Modem only install and secure the transducer guard using the four hex head screws Changing the ATM 887 or ATM 887R Modem Battery Pack For either the ATM 887 or the ATM 887R Acoustic Telemetry Modem both end caps require removal when changing the modem battery pack First the transducer end cap for an ATM 887 Acoustic Telemetry Modem or the top end cap for an ATM 887R Acoustic Telemetry Modem must be removed and then the POWER SERIAL connector end cap To change the modem battery pack for an ATM 887 or ATM 887R 1 Turn the modem off by pulling the on off switch all the way out
187. ocal modem to the PC turn it on and start TelesonarPC 2 Choose Configuration PC Communications The PC Communications dialog box shown in Figure 5 6 opens 3 In the Baud Rate area of the PC Configuration dialog box select the baud rate Configuring the Local and Remote Modems 5 16 BENTHOS Configuration r Baud Rate CommPort 19200 bps Comm 1 9600 bps Comm 2 4800 bps Comm 3 2400 bps Comm 4 C 1200 bps Handshaking r Serial C NONE c BR re RTS CTS Low Power PEZ C RTS CTS Echo Echo OFF C Echo GN SET Figure 5 6 The PC Configuration Dialog Box WARNING If the serial interface is changed from RS 232 to RS 422 an RS 422 serial interface connection to the modem is required to switch back to RS 232 The opposite applies after changing from RS 422 to RS 232 4 In the Serial Driver area select the serial interface NOTE Selecting RTS CTS Low Power turns off the RS 232 driver when the modem is in the lowpower state Therefore when making this selection be sure hardware RTS CTS handshaking at the host processor is disabled when the modem goes into the lowpower state otherwise the modem will not input data over its serial interface Selecting RTS CTS maintains the driver on even when the modem is in the lowpower state but draws an additional 2 mA of current Make this selection or use software XON OFF handshaking if hardw
188. ocessor Similarly the remote modem will transmit all the data received from its host processor to the local modem which will in turn output the data to its host processor Special Considerations When using the Online command take note of the following To display the message CONNECT followed by the acoustic baud rate and many other messages S Register 13 must be set to either 01 or 02 where 01 is the factory default setting 6 Modem Operating Modes and Commands Entering Commands 6 26 BENTHOS e If itis desired to enter commands after going online with the remote modem type in rapid succession to cause the local modem to go into Command mode Then enter the desired commands To go back online with the same remote modem use the Online command User s Manual P N 003452 Rev E Acoustic Telemetry Modems 6 27 Acoustic Link Test ATXn Syntax AT Xn Enter Definition The Acoustic Link Test command tests the acoustic link between the local modem and the remote modem at address n by causing the remote modem to transmit one of 8 preset test messages at the acoustic baud rate determined by the setting of S Register 4 of the remote modem Which preset test message is transmitted and whether the message is displayed when received by the local modem is determined by the setting of S Register 12 In addition the local modem measures and displays the following which are the received data statistics ERR Errors the numb
189. of the remote modem at address n AT BBn m Enter Output Data Logger Block Outputs block m of the remote modem at address n AT BCn Enter Clear Remote Data Logger Clears the contents of the data logger memory of the remote modem at address n AT BNn Enter Remote Bytes Stored Displays the number of bytes of data stored in the data logger memory of the remote modem at address n ATBC Enter Clear Local Data Logger Clears the contents of the data logger memory of the local modem ATBN Enter Local Bytes Stored 6 Modem Operating Modes and Commands Displays the number of bytes of data stored in the data logger memory of the local modem Entering Commands BENTHOS Table 6 1 ATM 880 and ATM 890 Series Acoustic Telemetry Modem User s Manual Command Syntax Command Set Continued Command Name Result ATBT Enter Output Local Data Logger Outputs the contents of the data logger memory of the local modem over the serial interface ATBPn Enter Output Local Page Outputs the contents of page n of the data logger memory of the local modem over the serial interface ATTNn Enter AGC Diagnostic Enables or disables the display of the automatic gain control AGC output of the local modem AT Tn Enter Release Status Displays the status of the SMART Release at address n AT Rn m Enter Release
190. oise profile begins scrolling from the left to the right of the display Profiles in green indicate a normal level of noise Yellow and red indicate high and very high levels of background noise respectively Generally an acceptable level of background noise is present when the maximum amplitude of the noise profile is below the bottom two thirds of the display If the noise profile is black there is no signal which could mean there is no transducer connected or there is a problem with the transducer or modem receiver 2 Click Halt Test or the Cancel button to stop the test and close the Noise Test window Modem Diagnostics 5 46 A User s Manual BENTHOS Performing the Ping Test The ping test verifies that the local modem s transmitter is functioning To perform the ping test 1 Choose Diagnostic gt Ping Test The Ping Test dialog box shown in Figure 5 18 opens In addition PING TEST is displayed on the Status bar Ping Test Freguency Start Ping Stop Ping Figure 5 18 The Ping Test Dialog Box WARNING Selecting a frequency that is not in the frequency band of the modem s transducer may result in damage to the transmitter 2 Select the freguency in kilohertz using the Freguency slider When changed the displayed frequency turns from black to blue 3 Click SET The new frequency is set and the display turns back to black 4 Click Start Ping The local modem is commanded to ping
191. on Dunking Transducer Deployment The AT 408 Omnidirectional Transducer or the AT 421 Directional Transducer can be used as a dunking transducer with the ATM 891 Deck Box When a remote transducer is used as a dunking transducer the 25 meter cable that is included with the deck box is used both to connect to the transducer and to lower it into the water This cable must be strain relieved at the transducer end Therefore a Kellums grip is installed on the cable for this purpose To strain relieve the cable tie a nylon line from the loop in the Kellums grip to one of the holes in the connector guard When securing the line ensure that there is sufficient slack in the section of cable between the Kellums grip and the transducer connection to relieve any strain In addition when using a remote transducer as a dunking transducer it may be required to add weight to the transducer to ensure it remains vertical in the water column User s Manual P N 003452 Rev E Acoustic Telemetry Modems 3 9 Subsea Modem Deployment Any of the subsea modems namely the ATM 885 the ATM 885R the ATM 887 or the ATM 887R Acoustic Telemetry Modem are typically moored on the sea floor attached to a subsea structure or installed on an AUV In all cases the modem s built in transducer or its remote transducer should be mounted such that it is oriented correctly Refer to Transducer Orientation on page 3 7 for more specific requirements and to Section 9
192. pages 4 Setup and Test Modem Connections 4 4 BENTHOS ATM 891 Deck Box Front Panel Connectors The ATM 891 Deck Box front panel connectors and their description and use are listed below and are shown in Figure 4 3 Connector Description and Use AC POWER CEE type AC input connector that connects to the AC power source DC POWER 2 banana jacks binding posts red and black that connect to the DC power supply 21 28 VDC SERIAL I O DB 9S RS 232 422 female serial port connector that connects to the host processor TRANSDUCER 10 pin 97 3102A18 1S female connector that connects to the remote transducer SPEAKER MODEL ATM 891 VOLUME HIGH SPEED ACOUSTIC TELEMETRY MODEM North Falmouth MA U S A CONTROL _ BENTHOS POWER ON LED AC ON OFF SWITCH TRANSDUCER AC POWER CONNECTOR DC POWER CONNECTORS TRANSDUCER SERIAL I O RED 21 28 VDC CONNECTOR CONNECTOR BLACK COMMON Figure 4 3 ATM 891 Deck Box Front Panel User s Manual P N 003452 Rev E Acoustic Telemetry Modems 4 5 Subsea Modem Connectors All the subsea modems include a POWER SERIAL connector on the bottom end cap for the external power and RS 232 422 connections The ATM 885R and ATM 887R Acoustic Telemetry Modems also include a TRANSDUCER connector on the top end cap for connecting to a remote transducer A 2 meter cable is supplied for this p
193. pecial Considerations When setting S Register 2 take note of the following f packet retry is enabled and if more than 12 kbytes of data are to be transmitted then hardware RTS CTS handshaking should be used f packet retry is disabled and if more than 16 kbytes of data are to be transmitted then hardware RTS CTS handshaking should be used 7 Modem Operating Parameters S Registers 7 8 BENTHOS User s Manual P N 003452 Rev E Acoustic Telemetry Modems Serial Baud Rate Default Setting 02 7 9 53 The baud rate of the modem s RS 232 422 serial interface is 9600 baud with no echo Definition The setting of S Register 3 determines the baud rate of a modem s RS 232 422 serial interface Available Settings The available settings for S Register 3 are listed below and include settings with and without echo If a PC is being used as the host processor and it is desired to display all of the characters entered from the keyboard select from the settings with echo only if the PC s terminal program does not have echo capability If the terminal program has echo capability select from the settings without echo and turn the program s echo feature on 05 00 01 02 13 08 09 10 AN 1200 baud RS 232 no echo 2400 baud RS 232 no echo 4800 baud RS 232 no echo 9600 baud RS 232 no echo 1200 baud RS 422 no echo 2400 baud RS 422 no echo 4800 baud RS 422 no echo 9600 baud RS 422 no
194. pensive electrical cable between a deployed instrument and a surface buoy This is especially advantageous when multiple instrumentation packages which are deployed within the same general area must communicate by way of the same RF channel The ATM 891 Deck Box can be used to retrieve data that have been collected by deployed instruments over a period of time and stored by the modems An example of this is shown in Figure 1 9 where several deployed instrumentation packages are shown each connected to an ATM 887 Acoustic Telemetry Modem which has a built in directional transducer and can be deployed in water depths up to 6000 m 19 680 ft The data that are ATM 891 DECK BOX ABOARD SHIP b EC AT 421 DIRECTIONAL NEC TRANSDUCER PITCH AND ROLL CURRENT METER ECE DATA SENSORS ATM 887 MODEMS gt RR PRR Figure 1 9 Periodic Acquisition of Stored Data P N 003452 Rev E Acoustic Telemetry Modems 1 13 1 Overview collected by the instruments are stored by the modems over long periods of time and then periodically retrieved In this application because directional transducers are used and the transmission medium is the vertical channel reliable higher speed communications can be obtained with minimum multipath from sea surface and sea floor reflections AUV Command and Control AUVs can only be controlled by an acoustic link The ATM 880 and ATM 890 Series Acoustic Telemetry Modems provide th
195. played on the monitor of the host PC if a PC is used as the host processor The idle time is reset to zero when the modem receives input either from its host processor or from a remote modem WARNING Although the idle time can be set to prevent the modem from going into the lowpower state for an indefinite time if the modem is being powered by batteries this setting will rapidly deplete the capacity of the modem battery pack Hence if batteries are being used to power the modem it is important that the idle time be set as short as possible When a modem is in the lowpower state its receiver is still active Therefore it can be awakened by input either from its host processor over the serial interface or from a remote modem over the acoustic link L3 NOTE For the modem to be awakened acoustically a lowpower wakeup signal must be transmitted by the transmitting modem To enable the transmission of the lowpower wakeup signal set S Register 17 of the transmitting modem to 01 If the modem is awakened by the host processor it immediately goes into the operating mode determined by the setting of S Register 15 If the modem receives a signal over the acoustic link from a remote modem it immediately checks the signal to see if it is being addressed either with its unique address or with the global address that is the same for all the modems If the modem does not recognize its address or the global address it remains in the lowpower state If
196. played which will help in isolating the problem D Verify that the command is being sent correctly Refer to Table 6 1 on page 6 12 for a list of the available commands and their syntax E If the modem is a subsea modem verify that the modem battery pack has not been depleted After entering a command that requires the modem to transmit an acoustic command transmissions can be heard from the local modem but there are no responses heard from the remote modem A Verify that the correct address for the remote modem is being entered when entering the command B Verify that the correct modem transducers have been selected and that they are oriented correctly Refer to Remote Transducer Selection on page 3 1 for information on making the optimum selection C Verify that the remote modem is switched on For a subsea modem deployed in deep water water pressure will push the on off switch in turning on the modem If deployed in shallow water it may be necessary to retrieve the modem to verify that it is turned on D If the remote modem is a subsea modem verify that the modem battery pack has not been depleted 8 Maintenance and Troubleshooting Troubleshooting Acoustic Telemetry Modems 9 1 9 Drawings This section includes the outline and wiring drawings for the ATM 880 and ATM 890 Series Acoustic Telemetry Modems including the surface and subsea modems the modem board sets and the remote transducers Refer to thes
197. rate is reduced to half of what it is without the multipath guard period For a multipath guard period of 12 5 milliseconds the baud rate is reduced to two thirds Data Redundancy Data redundancy which is also referred to as frequency diversity is a method whereby the same data bits are transmitted two or more times in the same data frame For example if the baud rate is 600 bits sec a data redundancy of two reduces the effective baud rate to half this rate or 300 bits sec 1 Overview Methods for Increasing Reliability Acoustic Telemetry Modems 2 1 2 Specifications This section provides the specifications for the Benthos ATM 880 and ATM 890 Series Acoustic Telemetry Modems including the remote transducers and the modem battery packs General The general specifications apply to all of the ATM 880 and ATM 890 Series Acoustic Telemetry Modems Frequency bands 9 14 kHz LF 16 21 kHz MF and 25 30 kHz HF Data modulation PSK and MFSK Baud rate 2560 15 360 bits sec PSK transmit 140 2400 bits sec MFSK transmit and receive Addressable modems 100 Processing features Data redundancy 1 2 rate convolutional coding Multipath guard period Operating temperature 5 C to 50 C Storage temperature 45 C to 85 C Serial interface RS 232 422 at 9600 4800 2400 or 1200 baud Flow control RS 232 hardware RTS CTS handshaking or software XON XOFF RS 422 software XON XOFF handshaking 2 Specifica
198. rcuit board set mounted to a chassis and an omnidirectional or directional transducer which is configured with a block mount and a bulkhead connector It is externally powered and is designed for original equipment manufacture OEM applications where the modem is integrated into a housing or chassis of another manufacturer s design 1 Overview Modem and Transducer Configurations 1 8 User s Manual BENTHOS DIRECTIONAL OR OMNIDIRECTIONAL TRANSDUCER INCLUDED WITH ATM 885PCB T L 885 Ic iE 1 5 ATM 885RPCB USED WITH r AT 408 OR AT 421 REMOTE Sl TRANSDUCER ATM 885RPCB Figure 1 5 ATM 885PCB and ATM 885RPCB Modem Board Sets ATM 885RPCB Modem Board Set The ATM 885RPCB Modem Board Set is shown in Figure 1 5 The ATM 885RPCB is externally powered and is for OEM applications However the transmitter is not included as the board set is specifically configured to connect directly to one of the remote transducers Remote Transducers The remote transducers consist of two types AT 408 Omnidirectional Transducer An omnidirectional transducer available in any one of three different frequency bands AT 421 Directional Transducer A directional transducer available i
199. ry Modems 4 1 4 Setup and Test This section provides instructions on how to unpack set up and test the ATM 880 and ATM 890 Series Acoustic Telemetry Modems In addition some simple startup procedures are provided that will help to quickly verify that the modems are operating properly and that commands and data are reliably transmitted and received Specifically the following topics are covered Unpacking and inspection Some typical modem configurations Modem connections Operator functions Setting up and checking the modems Verifying operation of the modems NOTE Once the modems are set up and are operating refer to Section 5 TelesonarPC for instructions on how to easily configure and operate the modems using TelesonarPC Also refer to Section 6 Modem Operating Modes and Commands for detailed information on the modem commands and how to enter them Unpacking and Inspection The ATM 880 and ATM 890 Series Acoustic Telemetry Modems their associated components and this manual are carefully packed in sealed boxes Every effort is made to pack the modems to protect them during shipment However carefully inspect the boxes for any signs of external damage and immediately report any damage to Benthos and to the freight carrier After inspecting the boxes locate and remove the packing list which is on the outside of one of the boxes While referring to the packing list carefully remove the contents of each
200. s BENTHOS Table 6 1 ATM 880 and ATM 890 Series Acoustic Telemetry Modem User s Manual Command Syntax Command Name Command Set Result Online Interrupt Causes the local modem to go into Command mode AT Enter Attention Resets the local modem idle time timer and verifies communications between the host processor and the modem ATDn Enter Dial Causes the local modem to go into Online mode and to go online with the remote modem at address n AT amp F Enter Factory Reset Resets the local modem s S Register settings to their factory default settings ATH Enter Hang Up Causes all the remote modems to go into the lowpower state ATO Enter Online Causes the local modem to go into Online mode from Command mode ATXn Enter Acoustic Link Test Tests the acoustic link with the modem at address n ATYn Enter Multiple Baud Rate Test Tests the acoustic link with the modem at address n at multiple baud rates AT Pn m Enter Remote Power Sets the transmit power level of the remote modem at address n to level m AT An m Enter Remote Baud Rate Sets the transmitting acoustic baud rate of the remote modem at address n to m ATSn Enter Read Register Displays the setting of the local modem s S Register n AT Sn Enter Read Remote Registers Displays the S Register settings of the remote modem
201. s and commands is important when integrating and operating the modems with other subsea instrument packages The modem commands are listed in Table 6 1 on page 6 12 Also listed in the table are the page references to where detailed descriptions of the commands are provided Although the modem commands control the operation of the modems the operating parameters which are determined from settings that are stored in 21 nonvolatile memory locations called S Registers directly affect how many of the commands are applied and how a modem functions in each of its operating modes For a detailed description of the S Registers and how to set them refer to Section 7 Modem Operating Parameters S Registers Many of the S Registers are called out in this section NOTE TelesonarPC cannot be used to enter modem commands The modem must be connected to a computer that is set up to run a terminal program such as ProComm Plus Hyperterminal or DumbTerm DumbTerm is available from RD Instruments Refer to Setting Up the Modems on page 4 7 for instructions on how to connect the modem to a PC and how to set up the PC as the local host processor Operating Modes The ATM 880 and ATM 890 Series Acoustic Telemetry Modems operate in three distinct operating modes Online mode Command mode and Datalogger mode Essentially the operating modes determine how a modem handles input from its host processor over the serial interface In Online mode the input is
202. se Timeout S7 ERES Forwarding Delay 58 ERES IdleTime S10 al gt Test Packet Size 12 256 Bytes E Verbose Level 513 STANDARD zi Operating Mode 515 ON LINE 2 Low Power Wakeup S17 gt Packet Retry Mode 52 gt Factory Reset Serial Port Advanced Figure 5 12 The Remote Modem Configuration Dialog Box gt NOTE In the Remote Modem Configuration dialog box buttons and arrows in drop down list boxes that are dimmed are not available In addition the entry in the Modem Software Version S0 text box and the Max Acoustic Receive Baud Rate S9 text box cannot be changed User s Manual P N 003452 Rev E Acoustic Telemetry Modems 5 27 5 TelesonarPC 10 11 12 13 14 Select ENABLE in the Doppler Tracking S1 scroll box to enable Doppler tracking or DISABLE to disable Doppler tracking Select DISABLE if the local and remote modems are a fixed distance apart Select the acoustic transmit baud rate in bits sec from the Acoustic Transmit Baud Rate S4 drop down list box Select the transmit power level in decibels in the Transmit Power Level S6 scroll box Select the distance between this modem and the modem that it will go online with in meters in the Acoustic Response Timeout S7 scroll box Select the forwarding delay in seconds in the Forwarding Delay S8 scroll box Select the idle time in seconds or select INFINITE in the Id
203. ses the Read Register command is shown in Figure 6 2 where all the S Registers were displayed by entering ATS Special Considerations The S Register settings can be interpreted from Table 7 1 on page 7 2 which includes page references to where detailed descriptions are provided 6 Modem Operating Modes and Commands Entering Commands 6 36 User s Manual BENTHOS gt ATS Local Registers S00 042 S01 001 S02 000 S03 001 S04 005 S05 000 S06 008 507 015 S08 060 S09 000 S10 255 S11 001 S12 000 S13 002 S14 001 S15 000 S16 000 S17 001 S18 000 S19 000 S20 000 gt Figure 6 2 Read Register Command and Resulting Display P N 003452 Rev E Acoustic Telemetry Modems 6 37 Read Remote Registers AT Sn Syntax AT Sn Enter Definition The Read Remote Registers command causes the local modem to display the S Register settings of the remote modem at address n gt NOTE For the local modem to execute entered commands the modem must be in Command mode with the command prompt gt displayed Ifthe modem is not in Command mode refer to page 6 11 for instructions on how to place the modem into Command mode How to Use To use the Read Remote Registers command type AT S followed by the address of the remote modem and then press Enter The local modem will display the S Register settings of the remote modem An example that uses the Read Remote Registers command is shown in Figure 6 3 where the S Reg
204. sh the switch all the way in To turn off the modem pull the switch all the way out This configuration causes the modem to turn on automatically when deployed due to ambient pressure ATM 885 ATM 885R ON OFF SWITCH ON OFF SWITCH Figure 4 4 Subsea Modem On Off Switches NOTE The ATM 888 Acoustic Telemetry Modem does not include an on off switch The ATM 888 is powered when DC power is connected to the POWER SERIAL connector P N 003452 Rev E Acoustic Telemetry Modems 4 7 Setting Up the Modems To check and operate the modems they must be connected to their host processors and transducers A host processor can be either a PC or an instrument The information presented in the following pages encompasses connecting the modems to PCs so that their operation can be verified and the acoustic link can be checked in air If an instrument is to be used as a host processor refer also to the documentation provided with the instrument Setting up the ATM 891 Deck Box Setting up the ATM 891 Deck Box requires making the power and serial interface connections and connecting a remote transducer as a dunking transducer When connecting the deck box to a PC refer to Figure 4 5 for the SERIAL I O connector pin orientation and to Table 4 1 for the pinout information PIN 1 PING PIN 5 PIS Figure 4 5 ATM 891 SERIAL I O Connector Table 4 1 ATM 891 SERIAL I O Connector Pinouts SIGNAL DIRECTION RXD RS
205. silicone lubricant and install the dummy connector supplied with the modem NOTE Be especially careful not to get any lubricant on the face of the transducer as this will severely degrade its performance For the ATM 885R and ATM 887R Acoustic Telemetry Modems perform all the steps listed below For the ATM 885 and ATM 887 modems go to Step 7 5 Unplug the remote transducer cable from both the remote transducer connector on the modem and the connector on the remote transducer inspect and clean the cable and then clean the connectors with an alcohol wipe 6 Lubricate the connector pins on both the remote transducer connector on the modem and the connector on the remote transducer with a light coat of silicone lubricant and install the dummy connectors supplied 7 Wash down the modem with clean fresh water and remove any debris that may have become attached to the housing 8 Clean the transducer with a mild non abrasive detergent being careful to remove any buildup After cleaning spray the transducer again with fresh water NOTE Do not use an ammonia based cleaner such as a glass cleaner to clean the transducer 9 Carefully inspect the transducer for any signs of damage Changing the Modem Battery Packs The subsea modems except for the ATM 888 Acoustic Telemetry Modem have an internal battery pack which will occasionally require changing To change the modem battery pack the modem requires disassembly a
206. sor over the serial interface or from a remote modem over the acoustic link in 180 seconds it will go into the lowpower state Definition The setting of S Register 10 determines the idle time which is the time after which a modem will go into the lowpower state if there is no input either from its host processor over the serial interface or from a remote modem over the acoustic link WARNING Depending on the setting of S Register 11 the RS 232 driver may be set to turn off whenever the modem is in the lowpower state Refer to RS 232 Driver Flow Control S11 on page 7 25 for information on S Register 11 Therefore hardware RTS CTS handshaking must be disabled at the host processor when sending the first byte of data to the modem over the serial interface After the first byte is sent handshaking can be turned on again or left disabled Available Settings The range of settings for S Register 10 is from 01 to 60 where each increment represents 5 seconds for a time range of 5 to 300 seconds In addition 00 sets the idle time to 2 seconds and 255 prevents the modem from going into the lowpower state indefinitely Special Considerations When setting S Register 10 take note of the following f a remote modem will be accessed once a day to retrieve a small amount of data the idle time should be set relatively short If there will be more frequent and more interactive sessions the idle time should be set relatively long to avoid the
207. splayed Command Mode When a modem is in Command mode input from its host processor over the serial interface is treated as commands A modem will go into Command mode when it is powered up only if S Register 15 is set to 00 NOTE The factory default setting of S Register 15 is 01 which causes the modem to go into Online mode when it is powered up 6 Modem Operating Modes and Commands Operating Modes 6 6 User s Manual BENTHOS When powered up in Command mode and if a PC is used as the host processor the monitor will display the banner message The message includes the frequency band LF MF HF or Nonstandard the firmware version and the command prompt gt as shown in the following example Benthos ATM 88X MF Frequency Band Acoustic Modem Version 5 0 gt To display this message and many other messages S Register 13 must be set to 01 02 or 03 where 01 is the factory default setting In Command mode any of the commands can be entered There are two basic types of commands commands that are executed by the local modem the modem where the commands are entered over the serial interface and commands that are sent by the local modem over the acoustic link to be executed by a remote modem The commands perform a number of different functions configuring the local modem s S Register settings going online with a remote modem reading a remote modem s S Register settings testing the acoustic link betwee
208. st Modem to Host Host to Modem RTS RX Request to Send RS 422 Receive TX RS 422 Transmit Modem to Host RXD RS 232 Receive Host to Modem Modem to Host Host to Modem TXD RX RS 232 Transmit RS 422 Receive gt NOTE The Device Enable output is on when the modem is sending data to the host or if the modem receives the Dial command ATD Refer to Device Enable on page 6 3 for more information Refer also to Section 2 Specifications for the electrical specifications 4 Setup and Test Setting Up the Modems 4 10 User s Manual BENTHOS NOTE When the modem is switched on the internal batteries automatically power the modem when there is no external power or if the external power drops below 22 VDC To connect the modem to a power supply and to an instrument using the RS 232 or RS 422 interface refer to the pinout information provided in Table 4 3 on page 4 9 for the POWER SERIAL connector and to the connector information provided with the instrument A mating connector pigtail is provided for this purpose To connect a subsea modem to a power supply and to a PC perform the steps listed below 1 Connect the connector pigtail to the POWER SERIAL connector 2 Refer to Table 4 4 and connect the pins listed to an available serial COM port on the PC The table shows the connections for a DB 9 serial port connector typically used on laptop co
209. subsea modem with a built in omnidirectional or directional transducer The modem operates on external User s Manual DC power only Physical Characteristics Housing construction Dimensions Mounting Weight in air Weight in water Operating depth PVC 11 4 cm 4 5 in max diameter by 43 2 cm 17 0 in long Fiberglass strongback 3 2 kg 7 Ib Neutrally buoyant 305 m 1000 ft Power Requirements External DC input power Lowpower state current DSP receiver current active Transmitter current active 14 28 V 0 5 mA typical 1 0 mA maximum 25 mA typical 1 A average 3 A peak 21 V MF HF 2 A average 5 A peak 21 V LF P N 003452 Rev E Acoustic Telemetry Modems 2 9 Input Output Power External DC power input Signal RS 232 422 serial interface data Device enable Active low open collector output Maximum sink current is 80 mA Maximum applied voltage is 40 VDC Transducers Type Built in LF MF or HF omnidirectional or MF directional Source level 21 V typ 178 dB re 1 uPa 1 m 3 28 ft for MF and HF omnidirectional 185 dB re 1 uPa 1 m 3 28 ft for LF omnidirectional 190 dB re 1 uPa 1 m 3 28 ft for LF and MF directional Source level 14 V typ 3 dB down from source level at 21 V ATM 885PCB Modem Board Set The ATM 885PCB Modem Board Set includes both a circuit board set mounted to a chassis and a directional or omnidirectional transducer I
210. t as shown in the following example for an ATM 891 Deck Box Benthos ATM 89X MF Frequency Band Acoustic Modem Version 5 0 gt Similarly for the ATM 880 Module and all the subsea modems the banner message is as in the following example Benthos ATM 88X MF Frequency Band Acoustic Modem Version 5 0 gt 4 Type AT and then press Enter The message OK and the command prompt are displayed 4 Setup and Test Checking the Modems and Host Processors 4 20 User s Manual BENTHOS NOTE When checking the acoustic link in air should the link appear not to be working vary the separation of the transducers In addition it may be required to change the transmit power level of the local modem usually to a lower level The transmit power level is set by using the Set Register command ATSn n to change the setting of S Register 6 For instructions on how to use the Set Register command refer to Set Register ATSn n on page 6 39 Refer also to Transmit Power Level S6 on page 7 15 for information on the available transmit power level settings 5 Enter the Acoustic Link Test command ATXn where n is the address of the modem that will receive the command and then press Enter The modem transmits a preset test message over the acoustic link and the following information which is the received data statistics about the received message is displayed ERR Number of bits not matching the test message CRC Che
211. t is externally powered and is designed for OEM applications Physical Characteristics Chassis Dimensions 7 1 cm 2 8 in wide by 6 6 cm 2 6 in high by 22 3 cm 8 8 in long Mounting Chassis mounting holes Power Requirements External DC input power 14 28 V Lowpower state current 0 5 mA typical 1 0 mA maximum 2 Specifications ATM 885PCB Modem Board Set 2 10 DSP receiver current active Transmitter current active Input Output Power Signal Device enable Transducers Type Source level 21 V typ Source level 14 V typ BENTHOS 25 mA typical 1 A average 3 A peak 21 V MF HF 2 A average 5 A peak 21 V LF External DC power input RS 232 422 serial interface data Transducers LF MF or HF Active low open collector output Maximum sink current is 80 mA Maximum applied voltage is 40 VDC LF MF or HF omnidirectional or MF directional 178 dB re 1 uPa 1 m 3 28 ft for MF and HF omnidirectional 185 dB re 1 uPa 1 m 3 28 ft for LF omnidirectional 190 dB re 1 uPa 1 m 3 28 ft for LF and MF directional 3 dB down from source level at 21 V ATM 885RPCB Modem Board Set The ATM 885RPCB Modem Board Set includes a circuit board set mounted to a chassis and is specifically configured to connect directly to any of the remote transducers It is externally powered and is designed for OEM User s Manual applications Physical Characteristics Chassis
212. tate when it receives the Hang Up command its Device Enable output will turn off Refer to Device Enable on page 6 3 for information on the Device Enable output 6 Modem Operating Modes and Commands Entering Commands 6 24 BENTHOS User s Manual P N 003452 Rev E Acoustic Telemetry Modems 6 25 Online ATO Syntax ATO Enter Definition The Online command causes the local modem to go into Online mode from Command mode and to go online with the remote modem whose address is the setting of the local modem s S Register 14 The command also sets the local modem s S Register 15 to 01 This setting ensures the modem will remain online after the local modem is powered down and then powered up again or is awakened from the lowpower state NOTE For the local modem to execute entered commands the modem must be in Command mode with the command prompt gt displayed If the modem is not in Command mode refer to page 6 11 for instructions on how to place the modem into Command mode How to Use To use the Online command type ATO and then press Enter The local modem will go online with the remote modem and then the local modem will display the message CONNECT followed by the transmitting acoustic baud rate of the local modem When the local and remote modems are online the local modem will transmit all the data received from its host processor to the remote modem which will in turn output the data to its host pr
213. ted four times with rate 1 2 convolutional coding and 25 ms multipath guard period 300 bits sec MFSK repeated twice with rate 1 2 convolutional coding and 25 ms multipath guard period 600 bits sec MFSK with rate 1 2 convolutional coding and 25 ms multipath guard period 800 bits sec MFSK with rate 1 2 convolutional coding and 12 5 ms multipath guard period 1066 bits sec MFSK with rate 1 2 convolutional coding and 3 125 ms multipath guard period 1200 bits sec MFSK with rate 1 2 convolutional coding 2400 bits sec MFSK 2560 bits sec PSK with rate 1 2 convolutional coding 5120 bits sec PSK with rate 1 2 convolutional coding 7680 bits sec PSK with rate 1 2 convolutional coding 10 240 bits sec PSK 15 360 bits sec PSK NOTE For the local modem to execute entered commands the modem must be in Command mode with the command prompt gt displayed If the modem is not in Command mode refer to page 6 11 for instructions on how to place the modem into Command mode 6 Modem Operating Modes and Commands Entering Commands 6 34 User s Manual BENTHOS How to Use To use the Remote Baud Rate command type AT A followed by the address of the remote modem a comma character and the value of m as determined by the required acoustic baud rate and then press Enter The remote modem will set its transmitting acoustic baud rate and then the local modem will respond with the message OK Special Considerations When using the
214. tes to Upload 3000000 Battery Chemistry Alkaline Lithium Transmit Power Level 21 dB Water Temperature o Calculate Figure 5 4 The Battery Capacity Calculation Dialog Box Set up for 10 User s Manual Calculating Battery Pack Usage when Transmitting One Large File Enter the expected length of deployment in days in the Length of Deployment text box which is available only when calculating battery pack capacity usage Select the One Large File option for the basis Enter the expected number of bytes that will be transmitted in the Number of Bytes to Upload text box Select the transmit power level in decibels in the Transmit Power Level scroll box Select the expected ambient temperature in degrees Celsius using the Water Temperature slider Click Calculate to calculate and display the required battery pack capacity usage or the maximum deployment length P N 003452 Rev E Acoustic Telemetry Modems 5 TelesonarPC 5 13 For the battery pack capacity usage calculation the Battery Calculation window opens with the battery pack capacity requirements displayed and a notification indicating whether the selected battery pack is adequate Battery Calculation EJ 1 2 A HRs Required Standard 18 A HR Alkaline Pack Has been derated for temperature to 13 5 4 HRs Can Be Deployed with Standard Alkaline Pack For the maximum deployment length ca
215. th the Set Register command ATSn n and then saved as the new startup configuration with the Write command AT amp W 6 Modem Operating Modes and Commands Entering Commands 6 22 BENTHOS User s Manual P N 003452 Rev E Acoustic Telemetry Modems 6 23 Hang Up ATH Syntax ATH Enter Definition The Hang Up command causes all the remote modems to go into the lowpower state It is not possible to send a Hang Up command to a specific modem Ca NOTE For the local modem to execute entered commands the modem must be in Command mode with the command prompt gt displayed If the modem is not in Command mode refer to page 6 11 for instructions on how to place the modem into Command mode How to Use To use the Hang Up command type ATH and then press Enter The local modem will send the Hang Up command to address FF which each modem will recognize as one of its addresses When the local modem has completed the transmission it will respond with the message Off Line Special Considerations When using the Hang Up command take note of the following To display the message Off Line and many other messages S Register 13 must be set to either 01 or 02 where 01 is the factory default setting e When a remote modem receives the Hang Up command it will not send an acknowledgment to the local modem Instead it will cease transmissions and go into the lowpower state Because a remote modem goes into the lowpower s
216. the Range Options 5 17 Selecting Units of Relative Speed 5 18 Configuring the Local Modem s Operating Parameters S Registers 5 18 Advanced Local Modem Settings 5 21 Configuring the Remote Modem s Operating Parameters S Registers before Deployment 5 22 Advanced Remote Modem Settings 5 25 Configuring the Remote Modem s Operating Parameters S Registers after Deployment 5 25 Configuring the Remote Modem s Serial Communications Port after Deployment 5 28 Configuring the Local and Remote Modems Using Auto Configuration 5 29 Operating the Modems after Deployment 5 31 Going Online with a Different Remote Modem 5 31 Checking the Acoustic Link between the Local and Remote Modems 5 31 Checking the Range between the Local and the Remote Modem s Transducers 5 32 Auto Ranging between the Local and Remote Modem s Transducers 5 33 Changing the Transmit Power Levels of the Local and Remote Modems 5 34 Changing the Acoustic Transmit Baud Rate of the Local and Remote Modems 5 35 Enabling and Disabling the Data Logger of the Remote Modem
217. the same remote modem use the Dial command If the remote modem goes into the lowpower state and S Register 15 is set to 00 then the modem will go into command mode To go back online with the same remote modem use the Dial command User s Manual P N 003452 Rev E Acoustic Telemetry Modems 6 21 Factory Reset AT amp F Syntax AT amp F Enter Definition The Factory Reset command resets the local modem s S Register settings to their factory default settings NOTE For the local modem to execute entered commands the modem must be in Command mode with the command prompt gt displayed If the modem is not in Command mode refer to page 6 11 for instructions on how to place the modem into Command mode How to Use To use the Factory Reset command type AT amp F and then press Enter The local modem will reset its S Registers to their factory default settings and respond with the message Factory Reset Special Considerations When using the Factory Reset command take note of the following Using the Write command AT amp W after using the Factory Reset command will save the S Register factory default settings as the startup configuration which is the S Register settings when the modem is powered up When the modem is powered up the S Registers will be set to their startup configuration This configuration is not necessarily the factory default settings as the S Register settings may have been changed wi
218. then press Enter The remote modem will transmit the preset test message selected by the setting of the local modem s S Register 12 at the baud rate determined by the setting of the remote modem s S Register 4 and the local modem will display the received data statistics described above In addition depending on the setting of S Register 12 the local modem will display the preset test message which consists of the alphanumeric ASCII character set Special Considerations When using the Acoustic Link Test command take note of the following The local modem must receive an acknowledgment from the remote modem within the acoustic response timeout which is determined by the setting of S Register 7 If an acknowledgment is not received Response Not Received will be displayed To optimize the performance and efficiency of the modems consider reducing the transmit power level of the remote modem with the Remote Power command AT Pn m and use the Acoustic Link Test command to verify a low error rate 8 or less Also consider increasing the remote modem s transmitting acoustic baud rate by changing the setting of its S Register 4 with the Remote Baud Rate command AT An m Again use the Acoustic Link Test command to verify a low error rate Similarly if a high error rate is observed consider increasing the transmit power level or decreasing the transmitting acoustic baud rate or both P N 003452 Rev E Acoustic Telemetry Mod
219. tically removed by indows To remove a program orto modify its installed components select itfrom the list and click Add Remove J Add Remove 4 Select TelesonarPC and then Click Add Remove 5 Click Yes when asked to confirm the removal of the program and all of its components TelesonarPC is uninstalled The Main Window The Main window which opens when TelesonarPC is started is shown in Figure 5 2 as it appears when a modem the local modem is connected to the PC and is online with a remote modem Access to all of the commands for the local modem and all of the remote modems is available from the Main window In addition the Main window includes Status displays a Status bar Terminal and Input displays and standard Windows features such as the Menu bar the Title bar and the Maximize Minimize and Close buttons 5 TelesonarPC The Main Window 5 6 Title bar Menu bar Terminal display Status displays BENTHOS Cancel button Maximize button Minimize button Benthos Telesonar PC File Predeployment Acoustic Communication Configuration Datalogger File Transfer Diagnostic Help 6 SENTHOS A Acoustic Baud Rate Downlink 1 2400 M Uplink Remote ID Local Power Level Remote Power Level Relative Speed Range T ax 10240 SET 15360 Max o00 SET FULL SET 3dB SET sc d 99K Battery
220. tions General 2 2 ATM 891 Deck Box The ATM 891 Deck Box connects to any of the remote transducers and is used to communicate with the subsea modems or another deck box In addition a host processor can be connected to the deck box through an RS 232 422 serial interface The deck box is also available in a choice three frequency bands 9 14 kHz LF 16 21 kHz MF and 25 30 kHz HF User s Manual BENTHOS Physical Characteristics Case construction Dimensions Weight Transducer cable Watertight with cover closed 25 4 cm 10 0 in high by 35 6 cm 14 0 in wide by 16 5 cm 6 5 in deep 5 kg 11 Ib 25 m 82 ft length standard 50 m 164 ft and 100 m 328 ft optional 545 kg 1200 Ib breaking strength Power Requirements AC input power External DC input power DC input current when not transmitting DC input current when transmitting Input Output Operator controls Displays and indicators 100 120 VAC 50 60 Hz 50 watts typ 200 240 VAC 50 60 Hz 50 watts typ auto sensing 21 28 V 160 mA typ 250 mA max 21 V 1 A average 3 A peak 21 V MF HF 2 A average 5 A peak 21 V LF Speaker volume control Power on off switch Power on off indicator Speaker P N 003452 Rev E Acoustic Telemetry Modems Power Signal Transducers Available types 2 3 AC power input DC power input RS 232 422 serial interface data Transducers AT 408 or
221. to page 6 11 for instructions on how to place the modem into Command mode How to Use To use the Lowpower State command type ATL and then press Enter The local modem will immediately go into the lowpower state and respond with the message Lowpower WARNING Depending on the setting of S Register 11 the RS 232 driver may be set to turn off whenever the modem is in the lowpower state Refer to RS 232 Driver Flow Control 11 on page 7 25 for information on S Register 11 Therefore hardware RTS CTS handshaking must be disabled at the host processor when sending the first byte of data to the modem over the serial interface After the first byte is sent handshaking can be turned on again or left disabled Special Considerations When using the Lowpower State command take note of the following To display the message Lowpower and many other messages S Register 13 must be set to either 01 or 02 where 01 is the factory default setting 6 Modem Operating Modes and Commands Entering Commands 6 44 User s Manual BENTHOS The local modem can be awakened by input either from its host processor over the serial interface or from a remote modem over the acoustic link When awakened the modem will go into the operating mode determined by the setting of S Register 15 When the modem is in the lowpower state the Device Enable output is turned off Refer to Device Enable on page 6 3 for information on the Device Ena
222. try Modems 3 3 Modem Battery Pack Capacity Calculations The modem battery pack which uses alkaline batteries provides an output of 21 V and a capacity of either 18 A h at 21 C for an ATM 885 or ATM 885R or 28 A h at 21 C for an ATM 887 or ATM 887R Acoustic Telemetry Modem NOTE The capacity of stored alkaline batteries decreases by approximately 5 per year at 21 C When supplying power to a load in a 0 C environment the capacity of alkaline batteries decreases by 25 Therefore do not use a modem battery pack that is greater than two years old and replace any modem battery pack that measures less than 90 of its rated capacity unless a very short deployment is planned Verifying the Modem Battery Pack Capacity for a Short Deployment To verify that the modem battery pack has adequate capacity for the amount of data to be transmitted during a short deployment of 30 days or less first determine the baud rate that is to be used Then referring to Section 2 Specifications determine the transmitter active current For a short deployment the lowpower state current can be neglected The required capacity in amp hours can be calculated by using the following equation Amp hours D x A R x 450 Where D the amount of data to be transmitted in bytes A the transmitter active current in amperes R the baud rate in bits second The constant 450 is derived from the conversions 8 bits byte and 3 600 seconds hour For exa
223. ty Usage and Deployment Length 5 14 User s Manual BENTHOS Battery Capacity Calculation z Calculate Battery Calculate Battery Capacity Deployment Length Battery Amp Hours ATM 885 18 A Hr C SR 100 28 A Hr C ATM 887 28 A Hr C Custom Acoustic Baud Rate E Length of Deplovment 30 Days Basis C Large File Periodic Data Number of Bytes per Message 500 Interval that message is sent 30 Minutes Battery Chemistry Alkaline Lithium Transmit Power Level 21 dB 4 Water Temperature o Calculate Figure 5 5 The Battery Capacity Calculation Dialog Box Set up for Calculating Battery Pack Usage when Transmitting Data Periodically Enter the expected length of deployment in days in the Length of Deployment text box which is available only when calculating battery pack capacity usage 6 Select the Periodic Data option for the basis 7 Enter the expected number of bytes that will be transmitted for each 10 message in the Number of Bytes per Message text box Enter the interval in minutes between transmissions in the Interval that Message is Sent text box Select the transmit power level in decibels in the Transmit Power Level scroll box Select the expected ambient temperature in degrees Celsius using the Water Temperature slider P N 003452 Rev E Acoustic Telemetry Modems 5 15 11 Click Cal
224. unications port reset its factory settings and using an advanced setup set its frequency band P N 003452 Rev E Acoustic Telemetry Modems 5 23 l 10 11 5 TelesonarPC NOTE For detailed information on the S Registers refer to Table 7 1 on page 7 2 which lists all of the available S Registers and the page references to where detailed descriptions and available settings are provided NOTE In the Predeployment Configuration dialog box the entry in the Modem Software Version S0 text box and the Max Acoustic Receive Baud Rate S9 text box cannot be changed In the Predeployment Configuration dialog box select the address of this modem using the left or right arrow for the Modem ID 518 scroll box In the Remote Modem ID S14 scroll box select the address of the modem that this modem will go online with when it is powered up or is awakened from its lowpower state This setting applies only when Operating Mode S15 is set to ON LINE Select ENABLE in the Doppler Tracking S1 scroll box to enable Doppler tracking or DISABLE to disable Doppler tracking Select DISABLE if the local and remote modems are a fixed distance apart Select the acoustic transmit baud rate in bits sec from the Acoustic Transmit Baud Rate S4 drop down list box Select the transmit power level in decibels in the Transmit Power Level S6 scroll box Select the distance between this modem and t
225. urpose Modem Operator Functions All the modem functions are controlled directly from the host processor including the keyboard of a PC if a PC is used as the host processor However a number of operator functions are provided on the front panel of the ATM 891 The subsea modems have only one operator function an on off switch that powers up and powers down the modem ATM 891 Deck Box Operator Functions The ATM 891 Deck Box operator functions and their descriptions and use are listed below and are shown in Figure 4 3 on page 4 4 Function Description and Use AC ON OFF switch An AC circuit breaker rocker switch that turns the deck box AC power on or off POWER ON LED A red indicator that is illuminated when power is applied SPEAKER Provides an audio verification of transmitted and received data VOLUME control A single turn potentiometer that controls the volume level of the speaker FUSE A 4 amp slo blow fuse that protects both the internal and if used the external DC power supply 4 Setup and Test Modem Operator Functions 4 6 User s Manual BENTHOS Subsea Modem Operator Functions The only operator function on the subsea modems is the on off switch which is located on the side of the end cap as shown in Figure 4 4 for the ATM 885 and ATM 885R Acoustic Telemetry Modems A similar configuration is provided for the ATM 887 and ATM 887R Acoustic Telemetry Modems To turn on the subsea modem pu
226. wnloaded over its serial interface by using the Output Local Data Logger command ATBT Refer to Output Local Data Logger ATBT on page 6 69 for instructions P N 003452 Rev E Acoustic Telemetry Modems 6 59 Output Data Logger Block AT BBn m Syntax AT BBn m Enter Definition The Output Data Logger Block command causes the remote modem at address n to output the contents of block m of its data logger memory over the acoustic link The range of block numbers is from 0 to 98 and each block contains a maximum of 4 kbytes of data NOTE For the local modem to execute entered commands the modem must be in Command mode with the command prompt gt displayed If the modem is not in Command mode refer to page 6 11 for instructions on how to place the modem into Command mode How to Use To use the Output Data Logger Block command type AT BB followed by the address of the remote modem a comma character and the selected block number of the remote modem s data logger memory The remote modem will output the contents of the selected data logger block over the acoustic link Special Considerations When using the Output Data Logger Block command take note of the following The local modem must receive an acknowledgment from the remote modem within the acoustic response timeout which is determined by the setting of S Register 7 If an acknowledgment is not received Response Not Received will be displayed
227. x SNR xx x SPD xx x AGC x x CCERR xx 7 Modem Operating Parameters S Registers 7 30 BENTHOS The received data statistics shown above are composed of the following Source The address of the modem that transmitted the data Destination The address of the modem that received the data CRC Checksum pass or fail where a pass condition signifies no errors were detected and a fail condition signifies one or more bit errors were detected MPD Multipath Delay in milliseconds where the higher the number the greater the multipath The range is from 0 to 50 SNR Signal to Noise Ratio in dB where the higher the value the better the acoustic environment SPD Speed the relative speed in knots between the local and remote modems where a negative number indicates the modems are moving farther apart and a positive number indicates the modems are moving closer together AGC Automatic Gain Control a decimal number where the lower the number the less gain which means a strong input signal was received Similarly the higher the number the more gain which means a weak input signal was received The lowest gain indication is 00 and the highest is 95 CCERR Corrected Channel Error Metric 0 14 Special Considerations When setting S Register 13 take note of the following When a PC is used as the host processor S Register 13 should be set to 01 When an instrument is used as the host processor S Register 13
228. yed 6 Modem Operating Modes and Commands Entering Commands 6 46 BENTHOS User s Manual P N 003452 Rev E Acoustic Telemetry Modems 6 47 Remote Doppler Tracking AT Dn m Syntax AT Dn m Enter Definition The Remote Doppler Tracking command enables or disables Doppler tracking for the remote modem at address n The settings for m are 00 and 01 as follows 00 Disable Doppler tracking 01 Enable Doppler tracking CI NOTE For the local modem to execute entered commands the modem must be in Command mode with the command prompt gt displayed If the modem is notin Command mode refer to page 6 11 for instructions on how to place the modem into Command mode How to Use To use the Remote Doppler Tracking command type AT D followed by the address of the remote modem a comma character and the value of m as determined by the reguired setting The remote modem will enable or disable its Doppler tracking and then the local modem will respond with the message OK Special Considerations When using the Remote Doppler Tracking command take note of the following To display the message OK and many other messages S Register 13 must be set to either 01 or 02 where 01 is the factory default setting The local modem must receive an acknowledgment from the remote modem within the acoustic response timeout which is determined by the setting of S Register 7 If an acknowledgment is not received Response Not

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