DSP4xxFP SA USER`S MANUAL A01561 Rev. A This Manual
Contents
1. Flex R7 lp y ht onn vu ee 2 fis ld mera 200004 b ss U B Dust Cy G a l 026 s SD 56 a UI8 y PCBA 110 1010 rev MU MODEL DSP419 496FP SA A01555 B GDI COMMUNICATIONS RS 232 or RS 485 Jumper JP4 Jumper block JP4 is use to configure the DTE interface to RS 232 or RS 485 Mode Jumper RS 232 1 2 default PEI 4 Wire RS 485 2 Wire RS 485 3 400 RS 485 Receiver Termination Jumper JP6 Termination Jumper Hi Impedance 1200hnms 16 DSP4xxFP SA Users Manual A01561 Rev A Chassis Ground Jumper JP5 Jumper block JP5 can be used to connect the chassis ground and the modem s signal ground together Mode Jumper Chassis Ground is isolated from Signal Ground 1 2 Chassis Ground is connected to Signal Ground 2 3 Production Test Enable JP3 Pin 2 amp 3 Jumper block JP3 is used for factory testing only JP3 must be in position 1 2 for normal operation DSP4xxFP SA Users Manual A01561 Rev A 17 Rear Panel Connections DTE Interface Power Interface 1 2 3 Audio Interface ZI Connecting the Modem s power The power adapter supplied with the modem is prewired with the proper terminal plug for the modem However it is possible to use the terminal plug with other power sources The pinout for the power connector is as follows Pin Function Chassis Ground DC DC Connecting to the DTE The DB25 connector is wired to the2. GDI Communications LLC Transportation Communications Specialists DSP4xxFP SA USER S MANUAL A01561 Rev A This Manual covers all configurations of the DSP4xxSA Modem with the Serial Number SA700425 and up DSP4xxSA User s Manual A01561 Rev X Proprietary Data This document contains confidential proprietary data with all rights and titles reserved by GDI Communications LLC By accepting this document the recipient assumes custody hereof and agrees not to dislcose this data or any portion of this data to any unauthorized person without the prior written consent of GDI Communications LLC Recipient further agrees not to incorporate these drawings specifications or technical information in whole or in part in any other product or endeavor THIS LEGEND SHALL BE INCLUDED ON ANY REPRODUCTION OF THIS DOCUMENT GDI COMMUNICATIONS LLC 280 l 80 West Exit 1 PO BOX 1330 Verdi Nevada 89439 Phone 775 345 8000 FAX 775 345 8010 www sgdi com TABLE of CONTENTS GLOSSARY ii i 1 GENERAL DESCRIPTION sass ia ia Sa e a eis p aue ivs 2 ENERALCHARACIERISI BE Si asa 3 INSTALLA ITON lt a is 6 GETTING STARTED 0 A A 7 CONCURA TON SWITCHES siii iii ii 8 AAA AAA i AM MM i a Mo em Dota Rates ST JS Ea l sess o 9 DTT ASN Character Party S Ld iii e E n Ore RE Ee ue RR ovt e Eu uds 9 AORTY SO Cre 10 Transm Carrier C oniro SEO a oeatceaamtantete A 10 ZO FWE Lea ed ANC Sd L asserted coupe a EP tede bu kt REN
3. Note Please refer to switch setting S2 9 forced RTS ON for other applications 2 or 4 wire leased line S1 7 OPEN 4 Wire Leased Line CLOSE 2 Wire Leased Line Switch S1 7 configures the modem for either 4 wire or 2 wire leased line operation DSP4xxFP SA Users Manual A01561 Rev A 11 Transmitter Impedance 1 8 OPEN 600ohm TX Termination CLOSE RTS Controlled In the RTS Controlled mode the transmitter s termination impedance is 600 ohms only when RTS is asserted When RTS is not asserted the transmitter s termination is at a high impedance This is can be used in multi point networks to reduce the load on the transmission line This configuration should be used for all slave modems to prevent the transmitting modem from being unnecessarily burdened If you use the modem with transmission lines that are transformer coupled or with an impedance isolated network such as a transformer bridge set switch S1 8 OFF for proper operation Remote Digital Loopback 1 9 OPEN Disable Remote DLB CLOSE Enable Remote DLB During instances of channel noise the modem may mistake a received preamble as a request to go into remote digital loopback Setting switch 1 9 to OFF prevents the modem from participating in a remote digital loopback with another modem Switch 1 9 does not prevent the modem from sending a remote digital loopback request to a remote modem 12 DSP4xxFP SA Users Manual A01561 Rev A
4. Introduction S1 and 82 are 10 position DIP switches used to configure most options and features of the modem They can be accessed externally from the bottom panel of the modem JP5 S2 a NOTE The configuration switches are toggle switches Use a small sharp pin to firmly press down on one end or the other to close or open the switch OPEN Switch is OFF CLOSE Switch is ON Open is to the left and Closed is to the right Switches will be referred to by their bank number and position number For example S1 3 is DIP switch S1 position 3 DSP4xxFP SA Users Manual A01561 Rev A Modem Data Rate 1 1 1 3 Baud Rate S1 1 S1 2 S1 3 19200 OPEN OPEN OPEN 9600 CLOSE OPEN OPEN 4800 CLOSE CLOSE OPEN De 240 OPEN CLOSE OPEN B Bell202T OPEN OPEN CLOSE 19200 is available only on DSP419FP models For modem speeds of 2400 bps or higher the modem uses QAM modulation automatically When the modem is operating at 1200 bps either in Bell 202T or ITU V 23 mode the modem uses FSK modulation Note Leased lines with a relatively flat 300 3400Hz bandwidth is required to support 19 200 bps operation DTE Async word length 1 4 OPEN 10 bit CLOSE 11 bit Switch 1 4 selects whether the async word length is 10 or 11 bits Any combination of bits may be used as long as it fits in the defined word length For instance in 10 bit mode the data word could consist o
5. This IC is programmed to modulate demodulate the transmission signal process handshaking signals control the status lights process the configuration switches and monitor the power Data is transmitted from the DTE through the DTE Interface to the DSP The DSP then converts the raw RS 232 data into a modulated bit stream which is then delived to the Digital to Analog converter The Analog signal is then conditioned for transmisison out the Analog I O Data received on the Analog I O is fed to the Analog to Digital converter and the delivered to the DSP The DSP then demodulates the signal and routes it out to the DTE The I O control configures the transmission line interface for the topology that the modem is being used in DSP4xxFP SA Users Manual A01561 Rev A 25 MAINTENANCE Preventative Maintenance The DSP4xxSA series of modems do not require maintenance Trouble analvsis If you encounter a problem with your modem be sure the switches on the modem are set to the appropriate positions If a switch is halfway between an on and off setting the modem will not operate properly Trouble Shooting Chart In the event you encounter a problem using your GDI modem refer to the troubleshooting information in this appendix if Perform These Procedures No LEDs are ON at the Check the power supply source Be sure the input front panel power to the modem s power connector is between 10 to 60VDC The MR LED sh
6. and the external signal is ignored RTS CTS and carrier is being transmitted constantly allowing the DTE to operate with the modem without supplying RTS signal Receiver Termination S2 10 OPEN High Impedance CLOSE 6000hms JP5 i 2 SW1 1 to SW1 ci di SW1 4 OPEN EE SW1 5 OPEN Ore SW1 6 OPEN ed SW1 7 OPEN Default Settings CLOSE SW1 8 OPENsI CLOSE swi 9 OPEN I t2 SW1 10 OPENsI ER OPEN SW2 1 to SW2 3 CLOSE SW2 4 OPEN 0 OPEN SW2 5 OPEN Di E CLOSE SW2 6 OPEN Di OPEN SW2 7 OPEN Dis CLOSE G B IPERZB 5 E IPEN 5 WW2 9 RT E LU 5442 10 OPEN Hi DSP4xxFP SA Users Manual A01561 Rev A Configuration Jumpers AQ ecco 25 C C21 040 pij Sua FUE Ti mal T N si 3 9 m2 SG Qa tae AE py OEC en 017 sess senza 103 amp 4 DIS x Q pas cio 3 d E Wr c R26 va ssszzzon dn DiOs 9 ATTIVA sess a D19 E ta Adan a to 3 D30 4 me EH a pa me Lip 1 8 e A E TES S _ l 15 4 Es lj E Ed Km 6U 00 E DN e e e de g LA ig Es LI a Cam ce SA ipe u 023 E a cf T FAN Fog v C4 DA 2 ll f g al Kai f 024 pr Bo gt C4 d a e RII Po EX Hes a A le ele ec om ye Hee tl WT es 08 9 8 KE oo B UR AGA ony xi RI M x J5 ag 2 s o bad q i Ri m o jit TUL Cj IB Eo ers i 28S R 3 ae E ee 40102 N z D eee HSO Ta L Jeces onto qu S q 18 IICA FFY B swell p
7. Re Train Enabled S1 10 19200 bps only OPEN Retrain Disabled for 19 2Kbps CLOSE Retrain enabled for 19 2Kbps When operating in high speed mode the modem s receivers require a special training pattern from the remote transmit modem to synchronize the receive timing before data can be received The DSP419FP will only send out a training pattern when it s RTS is raised from the OFF to ON i e Switched Carrier mode However if the modem is configured in Constant Carrier mode or the RTS is ON continuously no training pattern will be sent While in this mode where constant carrier is present at the receiving modem there is a possibility that the modem might lose synchronization due to transmission line interferences such as line hits line drop outs or power outage conditions In order to regain synchronization the DSP419FP implements a re train algorithm which allows the receiving modem to send out a re train request to the remote modem for re train and re gain synchronization This option is most useful for the modem to operate at 19200 bps and constant carrier or constant RTS modes DSP4xxFP SA Users Manual A01561 Rev A 13 Transmit Output Level 2 1 to 2 3 Level 924 S2 2 S2 3 OdBm_ OFF OFF OFF 2dBm OFF OFF ON 4dBm OFF ON _ OFF 6dBm OFF ON ON 8dBm ON OFF OFF 10dBm___ ON OFF ON BO 22dBm ON ON OFF 14dBm ON ON ON Switch
8. 10 Transmitter Impedance SLS nriran nn te Gee pete te o EACH ham 11 Remote Dien lLooppack 542 canina 11 Re fram En bled 81 10 19200 DDS ONLY is wi si iu ise id a aia 12 Transin Outpt LEVE S2 T 10 92 diia 13 Modem Receive Dynamic Range S24 scientibus 13 TX Cable Equalizer 82 5 Fast Poll Mode Only essere 13 RXCable Equaltzer 952 0 3 a a 13 AMSCO ES Zas 13 RIS CIS Delay S250 ki ati a t a 14 COnstant IS ON CS Zi Maat oct san cased duelaste se teme uuu E arduo Rue 14 Receiver Lerma OS ZION DO a t E A ATA 14 CONFIGURATION JUMPERS aia 15 R5 292 OT ROSAS SUMPET TAREA ESA AAA 15 RS 485 Receiver Termination Jumper IPO eese eene nnn nnns 15 Chassis Ground Jumper EOS iio Ai N E O 16 Production Test Enable FP5 Pi 209 a 16 REAR PANEL CONNECTIONS ccur nl 17 Connecting the Modem s POW T rysie sex ei t deor e v valo inge ud e yu edo e pa ai 17 Connec o to tne DTE S socia eoi oe cde Mss RM toe dI en 17 Connecting toa Pransmilssion LIVES AAA SAA 18 FRONT PANEL INDICATORS AND TEST SWITCH eeeeeeeeeeeeeeeeeen nnne nennen nnn nnne ens nns 20 TIE SERV Canis 21 ADJUSTMENTS i a a 23 THEORY OF OPE RA TION siii s eei ia EAE EHE eo aa rd 24 SYSTEMS DESCRIPTION INCLUDE BLOCK DIAGRAM eecceerhee eee enne 24 DETAILED DESCRIPTION OF CIRCUIT OPERATION ERROR BOOKMARK NOT DEFINED PREVENTATIVE MAINTENANCE tual a 25 OTRO Te i Y ata eet bella ta t al Sa A E EROR 25 TROUBLE
9. S Delay Bell 2021 only S2 9 Forced RTS ON S2 10 Receiver Termination 10 to 43dBm O to 30dBm Enabled Disabled Enabled Disabled 600 ohms Default Hi Impedance Hi Z DSP4xxFP SA Users Manual A01561 Rev A 33 19 200 bps OPEN OPEN OPEN Note 9600 bps CLOSE OPEN OPEN For modem speeds of 2400 bps or higher the modem uses QAM modulation automatically When the modem is operating at 1200 bps either in Bell202T or ITU V 23 mode the modem uses FSK modulation Note Leased lines with a relatively flat 300 3400Hz bandwidth is required to support 19 200 bps operation 34 DSP4xxFP SA Users Manual A01561 Rev A GDI COMMUNICATIONS L L C TRAFFIC EQUIPMENT MANUFACTURER e SPECIALIZING IN COMMUNICATIONS 280 l 80 WEST EXIT 1 P O BOX 1330 VERDI NEVADA 89439 TELEPHONE 775 345 8000 F AX 775 345 8010
10. SHOOTING CHART ik a fa a ei De bue da CE 25 WAVE RORVS a a do Ro sil e ido ee ee ide do patos d 27 VOLTAGE MEASUREMENT o e e de oe skut i EDEN sua 29 ALIGNMENT PROCEDURES aida 29 PARTS SA i nt 30 ELECTRICAL INTERCONNECTION DETAILS amp DRAWINGAS cecees 31 SCHEMATIC AND LOGIC DIAGRAM ERROR BOOKMARK NOT DEFINED ASSEMBLY DRAWINGS AND A PICTORIAL DIAGRAM ERROR BOOKMARK NOT DEFINED APPENDIX A CONFIGURATION SWITCH OVERVIEW CHART 32 DSP4xxFP SA Users Manual A01561 Rev A 1 GLOSSARY Anti Streaming A function on GDI modems that prevents a Host from transmitting continuously DCD Data Carrier Detect An EIA RS 232D control signal that can be used to gate RXD to a DTE DCE Data Communications Equipment A device that converts data from a DTE to a transport stream For example The GDI model 400 modem is a DCE that converts RS232 data from a controller to a FSK Telco system DTE Data Terminal Equipment A device that initiates communication over RS232 lines CTS Clear To Send An EIA RS 232D control signal that can be used to gate TXD data from a DTE Full duplex A communication system where data can be transmitted in both directions at the same time Half duplex A communication system where data can be transmitted in only one direction at a time FSK Frequency Shift Keying Communication protocol where data is encod
11. SP4xxFP SA Users Manual A01561 Rev A RTS to DIN ADAC Converter RTS TO Output Looped Output Input back to Input RTS to DOUT ADAC Converter Fast Poll Output Output Transformer DSP4xxFP SA Users Manual A01561 Rev A Voltage Measurements U18 Pin 5 5vdc_ 2vdc Alignment Procedures As there are no adjustments the DSP4xxFP SA modem does not require alignment 29 30 DSP4xxFP SA Users Manual A01561 Rev A Parts List DSP4xxFP SA Users Manual A01561 Rev A Electrical Interconnection Details amp Drawings The DSP4xxFP SA is a single board modem design and has no interconnections 31 32 DSP4xxFP SA Users Manual A01561 Rev A Appendix A Configuration Switch Overview Chart 19200 SW1 OPEN SW2 OPEN SW3 OPEN 9600 SW1 CLOSE SW2 OPEN SW3 OPEN 4800 SW1 CLOSE SW2 CLOSE SW3 OPEN 2400 SW1 OPEN SW2 CLOSE SW3 OPEN Bell 202T SW1 OPEN SW2 OPEN SW3 CLOSE V 23 SW1 CLOSE SW2 CLOSE SW3 CLOSE S1 S1 S1 S1 1 to S1 3 Modem Data Rate 19200bps for model DSP419FP only 7 2 or 4 wire leased line 2 wire half duplex 4 wire full duplex 8 Transmitter Impedance Controlled by RTS 600 ohms 1 10 Re Train Enabled 19200 bps Enable Disable only S2 1 to S2 3 Transmit Output Level From 14 to 0 dBm See chart below S2 4 Modem Receive Dynamic Range S2 5 TX Cable Equalizer S2 6 RX Cable Equalizer S2 7 Anti streaming S2 8 RTS CT
12. ed into binary format and represented by different frequencies Host Any DTE device MARK Signal state of a FSK system that represents a logical 1 value Private wire Telco communication hardware that is leased for private use SPACE Signal state of a FSK system that represents a logical 0 value 0 dBm Represents the signal level required to produce 1mw in a 60002 load Soft carrier Signal transmitted at the end of data to quiet the lines and turn the receiver off Surface mount parts Electronic parts that are designed to be soldered to pads instead of vias RXD Receive Data An EIA RS 232D data signal that transfers information in form of binary data to a DTE RTS Request To send An EIA RS 232D control signal that can be used to gate TXD to a DTE The DTE asserts RTS and then waits for the DCE to respond with CTS TXD Transmit Data An EIA RS 232D data signal that transfers information in form of binary data from a DTE DSP Digital Signal Processor 2 DSP4xxFP SA Users Manual A01561 Rev A GENERAL DESCRIPTION The GDI DSP4xxFP is a configurable baud rate modem designed for 4 wire full duplex or 2 wire half duplex operation over a voice band leased line or private line The modem is uses the latest digital signal processing DSP technology to achieve high performance It employs efficient modulation and encoding schemes to achieve fas
13. es 2 1 through 2 3 adjust the modem s output transmit level Modem Receive Dynamic Range 82 4 OPEN 0 to 30dBm CLOSE 10 to 43dBm For a strong receive signal set S2 4 to OPEN For a weak receive signal level set S2 4 to CLOSE TX Cable Equalizer S2 5 Fast Poll Mode Only OPEN Disabled CLOSE Enabled RX Cable Equalizer 82 6 OPEN Disabled CLOSE Enabled To improve or extend the modem s polling performance over long transmission lines enable the modem s Compromise Cable Equalizer when the distance exceeds 4 to 5 miles The cable equalizer is active only when the modem is in QAM fast poll mode Anti streaming S2 7 OPEN Disabled CLOSE Enabled Typically anti streaming is used in multi point applications to prevent a malfunctioning remote controller from transmitting indefinitely When anti streaming is active the modem will transmit for a maximum of 27 seconds On the next ON to OFF transition of RTS the anti streaming function resets 14 DSP4xxFP SA Users Manual A01561 Rev A RTS CTS Delav S2 8 OPEN 8 5ms CLOSE 33ms In Bell 202 mode switch S2 8 determines the duration of the RTS CTS delav in Bell 202 mode In V 23 mode the RTS CTS delay is fixed at 33 ms Constant RTS ON 82 9 OPEN Disabled CLOSE Enabled When constant RTS ON is Disabled RTS is controlled externally by the attached DTE device When Constant RTS ON is enabled RTS is set to ON internally
14. f the following 1 start bit 7 databits 1 parity bit 1 stop bit or 1 start bit 4 8 databits 4 1 stop bit In 11 bit mode the data word could consist of the following 1 start bit 8 data 1 parity bit 1 stop bit This switch setting is ignored when the modem is set at 1200 bps or less FSK modulation 10 DSP4xxFP SA Users Manual A01561 Rev A Auto RTS 1 5 OPEN RTS CTS Flow control CLOSE Auto RTS For serial interfaces that do not provide RTS i e only provide TXD RXD SG set the modem s switch S1 5 to CLOSE to enable auto RTS mode In this mode when TXD data is detected by the modem it turns on its internal RTS and carrier signals at the transmitter After the training time the TXD is transmitted The transmitter turns off if no TXD data is detected for approximately 2 characters Transmit Carrier Control S1 6 OPEN RTS controlled carrier CLOSE Constant carrier Constant carrier will force the modem to constantly transmit a modulated carrier However the modem still requires RTS to transmit data If constant carrier is enabled the modem forces the transmit carrier active and the RTS CTS delay is reduced to less than 0 5ms CTS is ON only if RTS signal is ON In RTS controlled carrier mode the RTS CTS delay is 23ms for 2400 bps and above Constant carrier mode is used in 4 wire point to point connections or at the master modem of a multi point polling network to reduce the RTS CTS delay
15. l switch selectable Carrier loss Train on data automatically recovery Throughput Less than 10 milliseconds for delay fast polling Auto RTS Support DTE without hardware RTS Anti 27 second timer to prevent streaming transmitter lock up network Enclosure Aluminum with removable front and rear panels Dimensions 5 7 wide x 8 5 long x 1 50 high Weight 1 5 lbs without AC to DC power converter module Interface connectors Leased Line 4 position screw terminal Data Terminal DB 25 female DSP4xxFP SA Users Manual A01561 Rev A Operating temperature Storage temperature Operating humidity Line isolation Surge protection 40 to 85 C 40 to 85 C 5 to 95 90 non condensing 1500 V RMS Leased line up to 15K VA 6 DSP4xxFP SA Users Manual A01561 Rev A INSTALLATION Unpacking the modem Check to make sure the following items are in the shipping box The Modem DSP4xxFP SA The power adapter with the terminal plug Transmission line interface cable Manual on CD DSP4xxFP SA Users Manual A01561 Rev A 7 Getting Started Configure the modem using the two sets of DIP switches and two sets of configuration jumpers on the printed circuit board of the modem labeled S1 and S2 JP3 JP4 JP5 and JP6 It is important to follow the steps described below in the order shown to ensure that you configure your modem properly using the modem DIP
16. lding current Traffic Controller y Modem EA E Point to Point Network Using the DSP4xxFP SA Modem orkstation DSP4xxFP SA Users Manual A01561 Rev A 19 Traffic Traffic a E s En E Controller Controller H o H Modem le ES Workstation Traffic Controller Traffic Controller EN fd f Multipoint Polling Network Using the DSP4xxFP SA Modem 20 DSP4xxFP SA Users Manual A01561 Rev A Front Panel Indicators and Test Switch The front panel indicators can be used to trouble shoot network connection and configuration issues The Test button invokes the local modems data loop back modes When the indicators light is on the associated signal is asserted or active In the case of the Control signals RTS CTS DCD and DSR when the indicator is on the signal is at the maximum signal level Typically 12vdc When the indicator is off the signals are at the minimum level Typically 12vdc But the signal level maximum and minimum levels will vary based on the device that is attached to the modem The TXD and RXD indicators will blink indicating data activity on the Transmit and Receive paths of the modem All indicators monitor the DTE side of the modem The PWR indicator turns on only when the internal regulated power supplies of the modem are operational DSP4xxFP SA Users Manual A01561 Rev A 21 TEST Switch The front panel of the mode
17. m has a momentary push button switch for initiating the loopback modes Analog LoopBack Press the TEST switch once The ALB LED should be ON In this mode the transmit data is looped back to the DTE as receive data This test will verify the modem transmitter receiver and its RS 232 interface along with the RS 232 cable Digital LoopBack Press the TEST switch twice The DLB LED should be ON In this mode the transmit data is looped back to the DTE as receive data This test will verify the modem s RS 232 interface along with the RS 232 cable 22 DSP4xxFP SA Users Manual A01561 Rev A Remote digital loopback Set the remote modem s 1 9 switch to Close Set the local modem s RTS signal to low Then press the TEST switch three times Both the ALB and DLB LEDs of the local modem should be ON Then raise the local modem s RTS signal to start the test The ALB and DLB LEDs of the remote modem should go ON if it responds to the remote digital loopback request This test will verify both modems transmitters receivers and the leased line DSP4xxFP SA Users Manual A01561 Rev A Adjustments The DSP4xxFP MODEMs do not require adjusting 23 24 DSP4xxFP SA Users Manual A01561 Rev A Theory of Operation Systems Description include block diagram ADC DAC VO Control Analog I O The DSP chip forms the main processing and control functions of the modem
18. ormat DTE interface Line conditions Operating modes Modulation 2100 Hz V 23 e Soft Carrier 900 Hz Bell 202T only 19200 9600 4800 2400 0 1800 Bell 2027 or 0 Equalizer Automatic adaptive 1200 bps V 23 Receiver 0 to 30 dBm or 10 to asynchronous dynamic 43 dBm 17 4 ms fast poll at ene 19200 bps Operating 40 C to 85 C 23 ms fast poll at temperature 2400 4800 9600 bps 8 or 33 ms Bell 202T 33 ms V 23 8 or 9 data bits with 1 or more stop bits or 7 data bit with parity bit EIA RS 232 V 24 or RS 485 2 wire HD or 4 wire FD compatible TELCO voice band 4 or 2 wire leased line conditioned or unconditioned Private metallic circuits up to 9 5 miles at 9600 bps 24 AWG without cable equalizer Up to 15 0 miles 24 AWG with TX and RX cable equalizer Up to 25 miles for FSK modes 2 wire half duplex or 4 wire full duplex over leased or private line QAM High speed fast poll mode FSK Bell 202T or V 23 compatible Mark 1200 Hz 1300 Hz V 23 e Space 2200 Hz 4 DSP4xxFP SA Users Manual A01561 Rev A Equipment connector for RS 232 and optional RS 485 Power Wide range switching powe supply supply e DSP419FP DSP496F AC version 90 to 265 Volts AC 50 60 Hz single phase or 90 to 400 VDC e DSP419FP DSP496FP DC DC version 10 to 60 Volts DC Surge Leased line up to 15KV protection Carrier Constant or switched DIP contro
19. ould be on if the modem is powered up properly and when it is not in any loopback test mode Modem does not Check the connecting RS 232 or RS 485 cable respond to the attached between the DTE and the modem The MR DSR DTE and the all LEDs LED Modem Ready Data Set Ready on the front are off panel should be ON when the modem is idle Modem does not receive Check the DIP switches of both modems to make data and the DCD and sure that the same data rate and operating RXD LEDs are off parameters are identical on both modems The receive line pair may be disconnected from the modem Make sure the transmission line connection to the modem is accurate and secure The receive signal level may be below the CD threshold Set switch S1 5 ON to see whether configuring the modem for a 43 dBm threshold resolves the problem If this problem remains unresolved perform a local ALB loopback test to determine if the modem s receiver is functioning correctly The RTS CTS and TXD The attached terminal or DTE may not be sending LEDs do not blink data to the modem Verify that data is being transmitted If data is being transmitted make sure the RS 232 cable is sound and securely connected to the modem and terminal or DTE 26 DSP4xxFP SA Users Manual A01561 Rev A DSP4xxFP SA Users Manual A01561 Rev A 27 Wave Forms INT Clock TP7 18 432Mhz WDI Watch Dog U17 Pin6 Interrupt WDI Watch Dog U17 Pin6 Interrupt ill 28 D
20. standard pinout of most RS232 interfaces However not all the signals are present The pinout for the DTE interface DB25 is as follows Pin Signal Direction Description CG ChassisGround TXD RXD RTS CTS DSR SG SignalGround_______ CD RXD RXD TXD TXD NI IN N N 18 DSP4xxFP SA Users Manual A01561 Rev A Connecting to a Transmission Line The modem can be connected in either a 2 wire S1 7 Closed or a 4 wire S1 7 Open network Pins 3 and 4 are the output terminals and pins 1 and 2 are the input terminals Pin Signal Direction Description 1 Rx T Input Receive Audio Tip 2 IRX R IInput Receive Audio Ring 3 Tx T Output Transmit Audio Tip 4 Tx R Output Transmit Audio Ring For 2 wire networks S1 7 must be closed and the transmission line cable pair is connected to terminals 3 and 4 on all modems in the network For 4 wire networks 1 7 must be open and the transmission line cable pairs are connected between inputs and outputs as depicted in the following graphic QOJ 4 Rx T LI O 2 RxX R oo S O BSD o E A EA O lake a a Tal Workstation 2 32 amp Cle ica Modem amp ea f ele j cul co O oOo While the transmission signals are not polarized it is recommended OOOO o that they be wired the same throughout the network NOTE The modem does not support leased line operation with DC shie
21. switches 1 Use DIP switch 1 1 to configure the modem for the host DTE interface and network topology Using S1 select the modem s operating speed to match the host computer or RTU devices and other DTE specific operating parameters Use DIP switch 2 S2 to select the modem s transmitter output level and receiver dynamic range specific leased line conditions The S2 settings apply for both high speed fast poll QAM and low speed FSK modes After you change the DIP switch settings cycle the power to the modem This will restart the modem with the new switch settings NOTE The DIP switch settings will not take effect until after the modem s power is cycled off and then back on While the configuration switches can be accessed externally the modem s PCB has to be removed from the chassis using the following procedures 1 Ground yourself to discharge any ESD which might cause damage to the sensitive devices on the modem board Disconnect and remove all the cables attached to the rear panel connectors Use a Philips screw driver to remove the rear panel and carefully slide the modem board out of the enclosure from the front panel end The location of the DIP switches and jumpers for the stand alone modem are shown in Figure 2 3 Carefully return the modem board into the enclosure Then replace the rear panel after the configuration is completed 8 DSP4xxFP SA Users Manual A01561 Rev A Configuration Switches
22. t signal detection training times It is backward compatible with Bell 202 and ITU T V 23 modems Employing a fast DSP processor and automatic adaptive equalizer the DSP419FP DSP496FP modem is ideally suited for multi point communication systems that require fast response time short training time and minimal throughput delay The DSP419FP DSP496FP modem is specifically designed for harsh environments typically associated in utility substations and industrial facilities The DSP419FP DSP496FP provides the following unique features that make it well suited for utility and industrial applications Packaged in a rugged compact enclosure for industrial applications Leased line interface protected with heavy duty surge protection devices Built in hardware watchdog timer automatically resets the unit if trouble is detected Operate over voice band conditioned or unconditioned leased line and pilot wires Accepts power from a wide range of AC and DC power supplies Asynchronous data rates selectable of 19200 9600 4800 2400 and 0 1800 bps Easily accessible DIP switches for user configuration and option selection DB25 F connector for RS 232 V 24 interface RS 485 interface is optional Local analog local digital and remote digital loopback diagnostics DSP4xxFP SA Users Manual A01561 Rev A GENERAL CHARACTERISTICS Data rate Modem Training Time RTS CTS Delay Data f
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