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1. VT MODEM 1 VT MODEM 2 VT MODEM 3 Industrial Modems Section 1 Section 2 Section 3 Section 4 Section 5 Section 6 Section 7 Section 8 Section 9 VT MODEM Overview Performance Specifications VT MODEM Mounting Electrical Connections Modem Configuration AT Command Summary S Register Summary Maintenance Information Product Support and Additional Documents ius C LISTER Class I Division 2 Groups A B C and D Hazardous Locations SIXNET mor ua Oc gt N 17 21 23 24 Section 1 Overview The SIXNET VT MODEMsS are rugged industrial telephone modems that have been designed for operation in electrical enclosures installed in harsh environments All VT MODEMS support all standard Hayes AT commands Fax Class 1 and Class 2 commands and S registers and therefore can be set up as an external modem on any PC The VT MODEMSs are compatible with any telecommunications or dial up networking software A VT MODEM allows easy access to PLCs SIXNET I O and other devices via dial in telephone connections The modem may be DIN rail or panel mounted for convenient and easy installation adjacent to other DIN rail components inside of new or existing enclosures Most Windows software can communicate through a VT MODEM to remote devices to perform file transfers diagnostics program debugging and many other operations SIXNET Industrial Modems allow communication to remote sites for data retrieval or
2. 4 Wire RS485 Device at Typical 4 Wire RS485 Bias the End of the Netvork VT MODEN 3 and Termination Components 15D_n Termination Q1 uF ro 79 m 1 Bias VT M DEM 3 DIP switch Settings QE aw Typical RS485 Network Bias and Termination Configuring a PC Modem to Communicate with a VT MODEM 3 in RS422 or RS485 Mode It may be necessary to change your PC s modem settings when communicating with a VT MODEM 3 running in RS422 or RS485 mode Here are the recommended settings 1 The PC modem 3 and the modem to modem speed should all be set to the same rate VT Modem User Manual Page 12 Last Revision 07 18 01 Section 5 Modem Configuration Configuring a VT MODEM for use with SIXNET I O All VT MODEM models are factory configured to use the default communication settings for SIXTRAK Gateways and VersaTRAK RTUs If a VT MODEM is connected to a PLC PC or other non SIXNET device then it may be necessary to reconfigure the modem See the upcoming sections for further details AT Command String at Powerup Upon powerup a SIXTRAK gateway or VersaTRAK RTU can send a command string to VT MODEM This capability can be used to assure that the modem is set to a particular mode of operation such as auto answer mode Refer to the Set Modem String topic in the Plant Floor program s online help for
3. Dial Default Set Result Code Format to terse or verbose V T Modem User Manual Page 17 Last Revision 07 18 01 RLSD DCD Option set DCD signal to indicate presence of carrier or forces DCD signal on at all times Select pulse dial make break ratio DSR Override sets how the modem controls the DSR signal Test amp diagnostic settings Display last connection statistics Store current active configuration in one of the two user profiles RTS CTS option sets how the modem controls the CTS signal Select synchronous clock source Asynchronous synchronous mode selection 8 Break Control sets how the modem responds to a break signal Select Modulation allows control of the modulation the modem uses to negotiate a connection Enable Disable RPI and DTE Speed Enable disable distinctive ring Download to flash memory Display current configuration stored user profiles and stored telephone numbers Designate a default reset profile This profile will be active after a hard reset Transmit Break to Remote sets the length of break signal sent to remote modem in non Enable Cellular Power Level Adjust only included for compatibility and performs no function Link Negotiation Speed only included for compatibility and performs no function V T Modem User Manual Page 18 Last Revision 07 18 01 MNP Extended Services Qn Enable Fallback to V 22bis V 22 only included for compatibility and performs no function SEC n Enable Di
4. com ports and detect the modem 3 Windows should find a modem called Standard Modem Click Next and Windows will complete installation of the Standard Modem Alternately click Change and select Standard Modem Types from the Manufacturers list and Standard 28800 bps Modem from the Models list 4 To verify that the modem has been installed select Start gt Settings gt Control Panel and then double click the Modems icon The modem should be listed as either a Standard Modem or a Standard 28800 bps Modem depending on the steps followed above Once the VT MODEM modem has been added to your Windows 95 98 or NT system it is ready for use If you are using SIXNET I O you can use the SIXNET Sixdial software to dial out and establish a connection with your SIXNET I O The Sixdial utility allows other SIXNET programs to perform operations such as data transfers hardware configuration and diagnostics and IsaGRAF programming Refer to the on line help in the Sixdial utility for more information on these software tools If you are using a PLC or other device refer to the documentation for that device as necessary To Remove a Modem If it ever becomes necessary to re install the modem for any reason select Start gt Settings gt Control Panel and then double click the System icon Next click the Device Manager tab The list should display a Modems icon Double click the Modems icon Highlight the modem to be removed and the
5. information on this capability Any standard AT command can be sent by the gateway or RTU Configuring a VT MODEM as an External Modem on a PC The VT MODEM can be connected directly to a PC The modem will need to be installed in Windows prior to use Here are instructions to install the modem in both Windows 95 98 and Windows NT Modem Installation in Windows 95 98 Plug and Play method recommended 1 With the PC off connect DC power and the telephone line to the VT MODEM Connect a communications cable VT CABLE MDM or equivalent between the VT MODEM and the PC Turn on the PC During the boot up process Windows should detect the modem and display the New Hardware Found dialog box 2 Make the selection Select from a list of alternative drivers 3 The Select Device dialog will be displayed In the column labeled Manufacturers select Standard Modem Types In the column labeled Models select Standard 28800 bps Modem Click OK Windows will then complete the boot up process The standard Windows driver is used for the VT Modem Although the VT Modem supports baud rates to 33 600 bps the selections in Windows are limited to 28800 bps 4 To verify that the modem has been installed select Start gt Settings gt Control Panel and then double click the Modems icon The modem should be listed as Standard 28800 bps Modem Here is an alternate modem installation procedure use if the PC is already powered up 1 Conne
6. 32 port before entering sleep mode a 25 Delay to DTR CT108 off sets time modem ignores DTR 0 255 s 0 01s 5 signal before taking action specified by amp Dn RTS to CTS CT105 to CT106 delay if amp RO is set 0 255 27 General Bit Mapped Options for sync async 73 49h control amp Mn amp Qn leased line control amp Ln clock select amp Xn Bell CCITT mode Bn S28 General Bit Mapped Options indicates options for pulse dialing amp Pn MNP Link negotiation speed Hn S29 Flash Modifier Time sets the length of time the modem will 0 255 10 ms 70 go on hook if the flash dial modifier is encountered in the im S30 Inactivity timer sets the length of time the modem will 0 255 10s EE S31 General Bit Mapped Options 1C Cad eee ad 534 835 LAPM Failure Control used when register S48 128 Desired Line Connection Speed when N1 is set 38 Delay before forced hang up time delay between the receipt of H command to disconnect and the actual S86 Call Failure Reason Code when the No Carrier result code 0 255 fissis ane fr e aue wrens gir Fax transmit attenuation level Result code messages control V T Modem User Manual Page 22 Last Revision 07 18 01 Section 8 Maintenance Information Troubleshooting Tips VT MODEM Default LED Indications All VT MODEM models have the following LEDs INN tn NNI This LED will come ON once a phone line connection has bee
7. C The VT MODEM has an automatic baud rate detection feature that lets the modem recognize commands through its serial port at any supported baud rate However if the modem is connected to a device that does not send commands or data unless spoken to such as most PLCs then the modem will pass information from the phone line to its serial port at the last auto detected baud rate This is typically the baud rate used by the VT MODEM setup Wizard when configuring the modem The VT MODEM is defaulted at the factory for 9600 baud To change this setting connect the modem to a PC Start the VT MODEM setup Wizard and choose the baud rate that matches the PLC s baud rate Then choose the appropriate settings and write the configuration to the modem Exit the VT MODEM setup Wizard and reconnect the modem to the PLC Be sure to cycle power to the modem Call the modem and verify that the PLC is responding to commands V T Modem User Manual Page 15 Last Revision 07 18 01 Limiting the Phone Line Connection Speed for Reliability Typically when a modem to modem connection is established the two modems negotiate and connect at the fastest possible phone line speed that is within the capability of both modems The quality of the phone line connection during the negotiation will be taken into account If both modems are of a modern design such as the VT MODEM the phone line speed can be 33 6K bits per second or higher using data compression Note th
8. DC VT MODEM 3 Input Current 65mA 24VDC typical Certification FCC Part 15 and FCC Part 68 UL 508 CSA C22 2 14 ACA TS 001 1997 ACA TS 002 1997 AS NZS3260 1993 AS NZS3548 1995 CTR21 98 482 EC EN55022 950 1991 Operating Temperature 30 to 70 C Storage Temperature 40 0 85 Humidity 5 to 95 RH non condensing Mounting DIN rail or panel mount Dimensions W x 4 75L x 1 35H inches 8 2 W x 12 1 Lx 3 4H cm PLC Discrete I O Interface VT MODEM 2 only Trigger Input From PLC Connects to PLC output Starts auto dialing upon transition from OFF to ON Modem will stay connected while input is ON Voltage Range 9 to 30 VDC 5 VDC RD Receive Data TD Transmit Data Power Input Current 6 5 mA at 24 VDC Max OFF Voltage On line Output To PLC Output is ON as long as a connection exists carrier detect Output Characteristics Sourcing switches supply power Max Output Current VT Modem User Manual Page 4 Last Revision 07 18 01 Section 3 VT MODEM Mounting The VT MODEM snaps onto standard DIN rail DIN EN 50022 or is mounted to a flat panel using 6 or 8 screws See Figure 3 1 The modem can be installed in any orientation directly adjacent to other DIN rail components or in any convenient location within the enclosure The modem should be installed within 6 feet of the device it will be connected to For SIXTRAK gateways and VersaTRAK RTUs use the SIXNET RS232 cable VT CABLE MDM whic
9. PLC s system programming port is connected to the computer at the other end of the phone link and may be polled by that computer as if the computer had initiated the call When the modem connects to the central computer it identifies itself so the computer can run the appropriate I O driver and interrogate the PLC SENDING A MESSAGE BASED UPON A SWITCH CONTACT Locations that do not have PLCs or other intelligence can originate calls to alert you to low tank levels over temperature conditions or other alarms Simply connect the appropriate alarm contact to the modem s input The modem will dial the pre stored phone number and deliver the ID message to the computer at the receiving end VT MODEM 3 RS485 Port The VT MODEM 3 Industrial Modem Plus has a RS422 RS485 port that can function in place of its RS232 port The RS422 RS485 port supports RS422 and RS485 full duplex and two wire RS485 half duplex communication to compatible devices The VT MODEM 3 is user configurable to communicate through either the RS232 port VT MODEM 1 mode or through the RS422 RS485 port Only one port can be used at a time VT MODEM SETUP WIZARD A modem setup utility is provided on the SIXNET CD to help you quickly configure any SEXNET Industrial Modem In most applications no knowledge of modem AT commands or S register contents is necessary Pre configured profiles for common situations are provided for your convenience An extensive online h
10. at after the modem is reset completely to the factory defaults it will no longer be set to auto answer which is often necessary for the modem to work when connected to a remote device Use the VT MODEM Setup Wizard to adjust these settings appropriately V T Modem User Manual Page 23 Last Revision 07 18 01
11. at this phone line speed is independent of the DTE serial port speed though some older modems require that the phone line speed and DTE speed be the same In practice the quality of any phone line changes continually and frequent data errors may occur The probability of errors usually increases as the phone line speed increases Therefore it is often desirable to restrict the phone line speed to a rate that will provide good performance and yield reliable data It is also commonplace to restrict the phone line speed to maintain compatibility when replacing an older modem with the VT MODEM By default the VT MODEM will permit any phone line speed up to 115 2 kbps when data compression is enabled If you experience intermittent or unreliable communication try setting the modem to modem speed in the VT MODEM Setup Wizard to a lower value to restrict the phone line speed Remember to load the new configuration to the modem VT MODEM Profile Summary Here is a summary of the active configuration user profile 0 user profile 1 and the factory defaults when the modem is shipped Each time the modem is powered up first the factory default settings as listed in Section 6 are loaded into the active configuration Next the designated user stored profile is loaded into the active configuration User profile 0 is loaded by default see the amp Y command in Section 6 and it contains all factory defaults with the exception that it is set to auto a
12. ate One RJ 11 jack is provided to connect directly to a telephone optional and the second RJ 11 jack functions as the connection to the telephone network PLC Self Dial I O Connections Connect a 10 30VDC signal to the From PLC trigger input terminal An OFF to ON transition of this signal starts the auto dialing sequence The modem will call and remain connected while the signal is ON When the signal goes false the modem will terminate the connection or the call in progress The To PLC on line output terminal will go ON ON user supplied VDC input when a modem to modem connection has been established and the proper Acknowledge Message has been received To Phone Line To Other Modems or a Telephone 10 30 VDC from PLC Discrete Output from PLC Triggers Self dialing Discrete Input to PLC Indicates a Connection Figure 4 3 VT MODEM 2 WIRING VT Modem User Manual Page 8 Last Revision 07 18 01 3 Power Phone Line RS422 RS485 Connections DC Power Wiring Connect 10 52 VDC to the VT MODEM 3 as shown in Figure 4 4 The modem can usually be powered from the same source as other devices in the enclosure All the screw terminals should be tightened to a maximum of 3 48 1 165 Telephone Cable Connect an analog phone line to the RJ 11 jack as appropriate RS422 RS485 Cabling and DIP Switch Settings Refer to Figure 4 4 for typical wiring configurations Fabricate a cable t
13. ct the DC power communications cable VT CABLE MDM or equivalent and telephone line as described above 2 Select Start gt Settings gt Control Panel and then double click the Modems icon 3 The Install New Modem dialog box will appear Do not select the Don t detect my modem I will select it from a list Instead click Next and allow Windows to search the com ports and detect the modem 4 Windows should find a modem called Standard Modem Click Next and Windows will complete installation of the Standard Modem Alternately click Change and select Standard Modem Types from the Manufacturers list and Standard 28800 bps Modem from the Models list V T Modem User Manual Page 13 Last Revision 07 18 01 5 To verify that the modem has been installed select Start gt Settings gt Control Panel and then double click the Modems icon The modem should be listed as either a Standard Modem or a Standard 28800 bps Modem depending on the steps followed above 6 Upon re booting the machine Windows may still find the VT MODEM as new hardware If this happens select Do not install a driver Windows will not prompt again Modem Installation in Windows NT 1 Select Start gt Settings gt Control Panel and then double click the Modems icon 2 The Install New Modem dialog box will appear Do not select the Don t detect my modem I will select it from a list Instead click Next and allow Windows to search the
14. diagnostics Note All VT MODEM models communicate over analog phone lines only L PT Any PLC Ta Phane Line To Other Modems or Telephone saan eee rom PiE S5595 3 1 Discrete Qutp Discrete Input to PLC Indicates a Connection The SIXNET PLC Self Dialing Modem VT MODEM 2 has all the features of the STXNET Industrial Modem VT MODEM 1 plus the ability to dial out based on an alarm contact or PLC discrete output VT MODEM User Manual Page 2 Last Revision 07 18 01 VT MODEM 2 Self Dialing Feature The Self Dialing Modem is triggered by a switch closure or PLC output signal It dials a pre stored phone number and optionally identifies itself by way of a pre stored ASCII message Flexible features allow this modem to perform retries or even connect to alternate number until it has verified that a connection has been established The call will terminate when either e The computer completes its polling and hangs up The modem discrete input is turned off e A telephone line problem disrupts the call The VT MODEM 2 enables field installed equipment to establish a telephone link based upon a simple switch closure This self dialing modem adds dial upon alarm intelligence to any remote site This enhanced modem 15 ideal for DIALING UPON ALARM FROM ANY PLC This modem establishes a connection based upon a coil output from any PLC Once a connection has been established the
15. ecommended DIP switch settings oa VI NODEN 3 for RS422 operation with termination enabled ond basing Baring does not apply ta R5422 Typical RS422 On on One Wiring Figure 4 5 Detailed RS422 RS485 Wiring and DIP Switch Settings VT Modem User Manual Page 10 Last Revision 07 18 01 VT MODEM 3 DIP Switch Summary 2 wire RS485 Cabling Receive Bias Enabled RS485 4 wire Cabling Transmit Bias Enabled RS485 2 and 4 wire Cabling 7 ON 8 OFF 2 wire Termination Enabled 7 8 ON 4 wire Termination Enabled L 7 ON 8 OFF 2 wire Termination Enabled 2 and 4 wire Termination Disabled Transmit Bias Disabled RS485 2 and 4 wire Cabling Receive Bias Disabled RS485 4 wire Cabling RS422 or 4 wire RS485 Cabling RS422 RS485 Network Termination The VT MODEM 3 has built in termination components for the Receive Data and Transmit Data signals Termination of these signals is enabled by setting DIP switches on the VT MODEM 3 Termination components are often built into other RS422 RS485 devices and are typically enabled by setting a jumper or DIP switch on the appropriate device Here are some guidelines for the use of termination e Terminations should be enabled at both ends of an RS422 communication cable e Terminations should be enabled at both end stations on an RS485 network No more than two stations should be terminated on an RS485 network Bias Resistors RS485 networks only On an RS485 two w
16. elp file is provided with this utility V T Modem User Manual Page 3 Last Revision 07 18 01 Section 2 Performance Specifications Telephone Line all models Max Data Rate 33 6 kbps V 34 Compatibilit V 34 V 32bis V 32 V 22bis V 22A B V 23 V 21 Bell212A amp 103 Data Compression V 42bis MNP 5 Error Correction V 42 MNP 2 4 Max Fax Modem Rate 14 4 kbps V 33 Fax Modem Compatibility Group 3 V 33 V 17 V 29 V 27ter V 21 ch 2 Ringer Equivalent Line Jack Phone Jack VT MODEM 1 and 2 RS232 Port all models Max RS232 Rate 115 2 kbps Kilobaud RS232 Signal Support TXD RXD CTS RTS DCD DTR DSR RI GND RS232 Connector DB9 female RS232 Command Set All standard AT and S register commands including Class 1 and Class 2 Fax commands RS422 RS485 Port VT MODEM 3 only RS422 mode RS485 modes e be 4 wire full duplex 2 or 4 wire party line operation half duplex Signal rate Standard rates up to 115 2 kbps Kilobaud RS422 RS485 distance Up to 0 5 miles Status LEDs all models CD Carrier detect The modem has detected a carrier on the phone line a remote modem has been detected TR Data Terminal Ready The PC or Gateway VersaTRAK has established a connection to the modem and is read Flashes as data is received from the phone line Flashes as data is sent out the phone line On when power is present General Characteristics all models Input Power 10 30 VDC VT MODEM 1 2 10 52 V
17. h is 6 feet in length 0 28 L0 71cm FRONT VIEW 0 25 0 64cm ojo BED WW 180 30 vix mcos om 3 17 8 05cm1 INDUSTRIAL MODEM i DIN VT MODEM SIXNET Made in usa EN 50022 1 35 4 75 12 07cm 344cm SIDE VIEW Figure 3 1 VT MODEM DIMENSIONS ALL MODELS e 9e 7 42cm 0 43 ya for 8 screw For DIN rail mounting hook the top rear of the modem onto the top edge of the DIN rail Using a small flat head screwdriver pull down on the spring loaded tab on the bottom of the modem and push the modem back against the rail Reverse these steps to remove the modem See Figure 3 2 below it DIN Rail EN50022 A Insert screwdriver and pull down to release spring loaded tab Swing modem against rail and release Figure 3 2 DIN RAIL MOUNTING VT Modem User Manual Page 5 Last Revision 07 18 01 Section 4 Electrical Connections RS232 Connections VT MODEM Models Use a VT CABLE MDM or equivalent cable to connect the modem s RS232 port DB9 Male cable end to the RS232 port on a SIXTRAK Gateway VersaTRAK RTU or PC DB9 Female cable end As shown in Figure 4 1 the VT CABLE MDM is a straight through serial communications cable suitable for connecting a DTE device PC Gateway or VersaTRAK to a DCE device VT MODEM Cable requirements for PLCs and other devices may be different Refer to the PLC or other device s documentation for cable pinouts Some PLC cables are docu
18. ire network there should be one pair of bias resistors acting upon the transmit receive wires On an RS485 four wire network there should be two pairs of bias resistors one pair on the receive wires and one pair on the transmit wires Bias resistors force the receive or transmit receive wires to a known non floating state when none of the RS485 devices are transmitting data If bias resistors are not present some RS485 devices may experience communication errors due to noise on the floating wires Bias resistors do not apply to RS422 wiring because the wires are always driven by the two RS422 devices The wires are not permitted to float The location of the bias resistors is not critical Typically they are installed at the master RS485 device Bias resistors are provided in VT MODEM 3 and are enabled through DIP switch settings There should be only one pair of these resistors connected to an RS485 two wire network and only two pairs of these resistors connected to an RS485 four wire network Refer to Figure 4 5 for recommended VT MODEM 3 DIP switch settings Do not enable the VT MODEM 3 bias resistors if there are bias resistors enabled on one of the other RS485 devices VT Modem User Manual Page 11 Last Revision 07 18 01 wire RS485 Device ot Typical 2 Wire RS485 Bias the End of the Netvork and Termination Components 485 Termination VT M DEM 3 VT MUDEM S3 DIP Switch Settings i
19. mented in the Technical notes provided on the SIXNET Programmable I O for Windows CD VI CABLE MDM Cable for VI MODEM to IBM COM Port or SIXTRAK VersaTRAK RS232 Port IBM Port or SIXTRAK VT MODEM Main PF User Port RS232 Port Female 089 Male DB9 DCO 1 P DCD 1 1 Figure 4 1 VT CABLE MDM Wiring V T Modem User Manual Page 6 Last Revision 07 18 01 1 Power Phone Line Connections DC Power Wiring Connect 10 30 VDC to the VT MODEM 1 as shown in Figure 4 2 The modem can usually be powered from the same DC source as other devices in the enclosure All the screw terminals should be tightened to a maximum of 3 48 in lbs Telephone Cable Connect analog phone lines to the RJ 11 jacks as appropriate One RJ 11 jack is provided to connect directly to a telephone optional and the second RJ 11 jack functions as the connection to the telephone network Modem RS232 Port 10 30 VOC Input 1 2 5 4 5 6 7 8 9 SIXNET Nee in USA Figure 4 2 VT MODEM 1 WIRING V T Modem User Manual Page 7 Last Revision 07 18 01 VT MODEM 2 Power Phone Line Self Dial Connections DC Power Wiring Connect 10 30 VDC to the VT MODEM 2 as shown in Figure 4 3 The modem can usually be powered from the same source as other devices in the enclosure the screw terminals should be tightened to a maximum of 3 48 165 Telephone Cable Connect analog phone lines to the RJ11 jacks as appropri
20. n click the Remove button To reinstall the modem follow the installation steps as previously described V T Modem User Manual Page 14 Last Revision 07 18 01 Configuring a VT MODEM Using the VT MODEM Setup Wizard It is highly recommended that the SIXNET VT MODEM Setup Wizard be used for VT MODEM configuration Simply check the appropriate boxes choose the appropriate communication settings from the dropdown lists and load the configuration into the VT MODEM This utility does not require user knowledge of AT commands and S registers Refer to the online help system in the VT MODEM Setup Wizard for instructions and application notes Note The VI MODEM Setup Wizard must be used to configure the self dial parameters of the VT MODEM 2 and the RS422 RS485 port parameters of the VT MODEM 3 SIXNET T MODEM Wizard Modem Parameters Select the proper modem parameters for your application ANS Restore Factory Modem Defaults Basic Modem Parameters Phone Number 1 BEE Enable Auto Answer on 1 Rings Iv Ignore assume anoe Camer Detect farce r Advanced Modem Parameters Disable Command Echo Disable Error Correction Flow Control None Disable Data Compression m Modem to Modem Speed Auto detect Speed to 9600 Fixed Speed 3600 z User Defined AT String lt Back Cancel Setting the Modem s Baud Rate for the PL
21. n established and will remain on for as long as the connection is maintained Transmit Data This LED will come ON whenever the modem sends characters out the phone line Power LED Normal Indication All models This LED will be ON when power is applied to the modem Additional States 2 only A Slow blink indicates an invalid configuration or that the Block COM Port Until Connected feature is enabled A Fast blink indicates that a self dial is in process or that the modem is in Configure Self dialing Parameters mode Note The RD and TD LEDs indicate the flow of characters in and out of the phone line interface of the VT MODEM and are not directly connected to the RS232 port all models or RS422 RS485 port VT MODEM 3 Reconnecting Serial Cables It is important to cycle remove and then reapply DC power to a VT MODEM each time the RS232 or RS422 RS485 cable is disconnected and then reconnected The serial port of the modem may not function properly if power is not cycled Resetting the VT MODEM all models If it ever becomes necessary to completely reset the modem including both user profiles to the basic factory default settings the following command can be issued AT amp F amp W amp WI CR This command string will load the factory defaults into the active configuration amp F and then save those settings into both user profile amp W and user profile 1 amp W1 Note th
22. nswer register S021 and ignore DTR amp D0 The User profile 1 contains all normal factory defaults as listed in Section 6 ACTIVE CONFIGURATION B1 EI LI M1 N1 Q0 T Vi WO X4 YO amp amp DO amp amp JO amp K3 amp Q5 amp R1 amp SO amp T5 amp X0 amp YO 500 001 501 000 502 043 503 013 504 010 S05 008 S06 002 507 050 S08 002 509 006 10 014 511 095 512 050 518 000 525 005 526 001 536 007 537 000 538 020 544 020 546 138 548 007 595 000 STORED PROFILE 0 B1 E1 LI MI NI QOT VI WO X4 YO amp C1 amp D0 amp G0 amp JO amp K3 amp Q5 amp R1 amp SO amp T5 amp X0 500 001 502 043 506 002 507 050 508 002 509 006 510 014 511 095 512 050 518 000 836 007 537 000 540 104 541 195 546 138 595 000 STORED PROFILE 1 B1 E1 LI MI NI QOT V1 WO X4 YO amp C1 amp D2 amp G0 amp JO amp K3 amp Q5 amp R1 amp 50 amp T5 amp X0 S00 000 502 043 506 002 507 050 508 002 509 006 510 014 511 095 512 050 518 000 836 007 537 000 540 104 541 195 546 138 595 000 FACTORY DEFAULTS B1 E1 LI M1 N1 Q0 T Vi WO X4 YO amp 1 amp D2 amp G0 amp JO amp K3 amp Q5 amp R1 amp SO amp T5 amp X0 S00 000 502 043 506 002 507 050 508 002 509 006 510 014 511 095 512 050 518 000 836 007 537 000 540 104 541 195 546 138 595 000 VT Modem User Manual Page 16 Last Revision 07 18 01 Section 6 AT Command Summary All VT MODEM models support the AT commands Fax Class 1 and Class 2 commands listed in this Section The VT MODEM contains a set of fact
23. o connect the modem s RS422 RS485 port to the field device s The VT MODEM 3 has DIP switches These switches establish the mode of operation for the RS422 RS485 port Set these switches to match the type of wiring connected to the RS422 RS485 port Refer to Figure 4 5 on the next page It is not necessary to cycle power to the modem if DIP switch changes are made Modem RS232 Port Pin Signa RS422 RS485 Port Scw Signal 4 10 52 VDC Input 1 2 3 4 5 6 7 8 9 _ AR GND DTR TD RD Den np s 52 17 fono t PSI 10 52 VDC 9 9 a 6 RS4B5 RS422 Port RI CTS RTS DSR 2325572 SEL Arton ON oF O Power ovd A34 5578 2 S RBBB EE orc Se Eee enabled Disabled RS485 RS422 7 TO Terminate Enabled Disabled Option Switches g RD Terminate Enabled Disabled INDUSTRIAL MODEM PLUS VT MODEM 3 SIXNET in usa Figure 4 4 Typical RS422 RS485 Wiring VT Modem User Manual Page 9 Last Revision 07 18 01 RS422 485 08 on SIXTRAK Gatenay or VersaTRAK RTU Recommended swrich set ngs on the VT NODEN 3 fer 2 wre RS485 aperaton wih bosing ond tarmmates encblad RS422 483 on SIXTRAK Batemey ar VersdTRAK RTU 123453678 ON Closed om Recommended DP swich settings on the VT NODEN 3 for 4 R5485 operofion Typicd 4 Wire RS485 with bosing ond tormanates onobled Multidrap Wiring 2 5 7 8 QN Closed or coms R
24. ory default settings which can always be restored by the user See the amp F command The modem also provides two user profiles profile 0 and profile 1 which hold settings as set and saved by the user See the amp W command The settings currently in use by the modem are generally referred to as the active configuration Notes VT MODEM 2 self dial parameters and VT MODEM 3 RS422 RS485 port parameters can only be set using the VT MODEM SETUP Wizard which is provided on the SIXNET Programmable I O for Windows CD Refer to the on line help in the VT MODEM Setup Wizard for more information The following tables only list the supported AT commands The valid parameters and default settings for each AT command are documented in the online help system of the VT MODEM Setup Wizard Re execute Last Command do not precede by AT command and do not follow with a carriage return Go on hook and Answer A cal Set data standard to CCITT Europe et J or Bell Mode U S Canada for at 300 or 1200 bps Dial originate a call usage ATDT5551212 to tone dial number ATDS n to dial nth stored Bumper Automode Enable enabled allows connection at highest possible modem speed Set Pulse Dial Default Quiet Results Codes Control when enabled result codes are reported to the monitor Establishes S Register n as the last register accessed Write value x to S Register n Reports the value of S Register n Set Tone
25. rier must be 1 255 0 15 Carrier loss disconnect time carrier must be absent for this 1 255 Pause time for dial delay modifier 0 255 1 time for modem to consider it a lost connection Escape prompt delay this delay must be present after 0 255 0 02s 50 receipt of the last character of the escape sequence before receipt of any other character for the escape sequence to be recognized SIS Reserved CT General bit mapped options indicates the status of the 138 8Ah following options echo quiet mode results codes tone pulse and originate answer d 516 __ o S7 Reeva SIS Test timer length of test initiated by amp Tn command 0255 s o AutoSync Bit Mapped Options o 520 AutoSyne HDLC Addr or BSC Sync Char 025 9 V24 general bit mapped options indicates the status of the 52 34h following options CTS amp Rn DTR amp Dn DCD amp Cn DSR amp Sn long space disconnect Yn Speaker results bit mapped options indicates the status of 117 75h the following options speaker control Ln volume Mn results codes Xn S23 General Bit Mapped Options 586Ab S24 Sleep inactivity timer sets the length of time that the 0 255 S modem will operate in normal mode without activity on the V T Modem User Manual Page 21 Last Revision 07 18 01 phone or RS2
26. sable MNP10 EC Mn Initial Cellular Power Level Setting only included for compatibility and performs no function Compromise Equalizer Enable only included for compatibility and performs no function B D NCn FAX CLASS FCLASS n FAE n FRH n FRM n FRS n FTH n FTS n FAXCLASS2 FCLASS n FAA n FBOR FBUF FCFR FCON FCIG FCIG FCR FCSI FDCC FDCS FDCS FDIS FDIS FDR FDT FDTC FET FET n FHNG VT Modem User Manual Page 19 Last Revision 07 18 01 Caller Def Enable Caller ID with Formatted Presentation CID 2 Enable Caller ID with Unformatted Presentation AudioSpan and DSVD Select AudioSpan DS VD Mode Fo Access Mode Enable Disable Synchronous Access Mode in the client or central site modem Configures the Operation of the Synchronous Access Submode elects Transmit Flow Control Thresholds Enable Disable DSVD VT Modem User Manual Page 20 Last Revision 07 18 01 Section 7 S Register Summary Note The following tables only summarize the supported S registers A description for each S register may be found in the online help system of the VT MODEM Setup Wizard ASCII Backspace character 0 255 ASCII i S6 Maximum time to wait after going off hook to dial when 2 255 sec EN RR S7 Maximum time to wait for carrier after dialing before 1 255 sec EE e ea a i ifi sec S9 Carrier detect response time duration that car

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