Multi-Tech Systems MT2834BR, MT2834BLR manual AT Commands and S-Register Summary

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Chapter 4 - Commands

4.3.1AT Commands and S-Register Summary

The vast majority of installations are similar, with the MT2834 being used to dial up a remote installation where the call is automatically answered. Your MT2834 has a default configuration to dial another 33,600 bps modem that support error correction, data compression and flow control. If the answering modem is not compatible, the MT2834 can match protocols, provided the protocols are industry standard (i.e., ITU-T or Bell) and not proprietary.

The &W command, used in conjunction with specific other AT commands and S-Registers, can reconfigure the MT2834 to conform to a specific application. The MT2834 can store its configuration parameters and S- Register values in its nonvolatile memory.

The command AT&W0 (or AT&W) causes the modem to store its current parameters in its nonvolatile RAM. The command also sets the modem upon power up, or when it is reset with an ATZ command, the modem reads all its configuration and S-Register parameters from RAM, and not from the factory settings in ROM (note you may recall factory installed defaults by entering AT&F8&W0). The &W command changes the configuration parameters stored in RAM that you specifically intend to alter. All other default parameters remain unchanged.

The AT&W1 command sets the modem so that it does not store its parameters in RAM, and on power up or when an ATZ command is issued, parameters are read from the factory default settings in ROM.

Before using the &W command, you may want to view the modem's current operating parameters. Use the ATL5, ATL6 and ATL7 commands to display the current modem configuration.

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Contents User Guide Revision Date Description Contents AT Commands and S-Register Summary Introduction Introduction FeaturesHow to Use This Manual Installation Telephone Line PreliminariesCard Cage Serial CableInstallation PC Board Controls Switch Function Position Effect DIP-Switch SettingsAnswer/Originate Originate call Async/Sync/Leased Line Dip Switch Settings #13 Position Effect OOS Busy Out Toggle Switch2 MI/MIC Option Jumper Out of Service/Test JumperDial-Up and Leased Lines Modem LED Indicators On-Line Diagnostics Installation Serial Port Limitations How Can You Identify Your Uart Type? MSD Uart Identification, Screen Configuring Software for Your Modem Configuring Your SoftwareAT &F X4 S0=0 M PC Initialization StringsMEW Modem Initialization Setup Macintosh Initialization Changing Default ParametersMEW Configuration Parameters Screen Configuring Software for Your ComputerTerminal Emulation Configuring Software for the Remote SystemFile Transfer Protocols When to Disable Data CompressionAT &F S0=0 X4 &E14 M Disabling Error CorrectionModem Commands Modem AT Commands Commands = 0, 1, 2 or DP0 #F2 Command Values Default = speed Q0 selects Result Codes displayed Reads value of S-Register r and displays value = 4 or Tone Command Break Atcr Values Default Description Callback Security CommandsCallback password with xxxxxx being callback password Remote Configuration Procedures Remote ConfigurationPassword Commands 4 V.25bis CommandsCSPs Escape Code Character RegistersLine Feed Character S10 Carrier Loss Disconnect Delay Time S25 DTR Dropout Time S36 Time Between DTR Inactive and Modem Off-Hook Result CodesTerse Verbose No Dial Tone Busy No Answer AT Commands and S-Register Summary Modem Testing Uuuu Local Analog Loopback Test/V.54 LoopDigital Loopback Test/V.54 Loop 2 Local/Manual Digital Loopback Test local / manual Digital Loopback Test remote / automatic Digital Loopback Test/V.54 Loop 2 Remote/AutomaticLocal Analog Loopback Test Syncronous Mode Local Analog Loopback Test Synchronous ModeDigital Loopback Test Local / manual Syncronous Digital Loopback Test Local/Manual Synchronous ModeDigital Loopack Test remote / automatic Syncronous Digital Loopback Test Remote/Automatic Synchronous ModeWarranty and Service Limited Warranty Tech Support ServiceRecording Modem Information Upgrading the MT2834BR Using FlashPro to Upgrade Modem FirmwareSafety Warnings Internet Babt Requirements Compliance with Babt Requirements European Low Voltage Directive Compliance with BS6789 .1 and Part Compliance with BS6328 Part Appendices Appendix a Appendix a Canadian Limitations Notice Data Rates modem Appendix B Technical SpecificationsFlow Control 2400 & 1200 bps Frequency Stability Index Index Index Index MNP SCC XON/XOFF S000316