Multi-Tech Systems MT2834BA Changing Default Parameters, Other Parameters, AT &F S0=0 &F9 &W0 CR

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Chapter 3 - Software Configuration

3.3.1Changing Default Parameters

By default, the modem will answer after the first ring and try to communicate with a modem on the other end of the line. If you have one telephone line for voice, fax, and modem communications, the modem may attempt to answer all incoming calls, voice as well as data. To change auto-answer to default off, open your communications program and type the following string in the terminal window:

AT &F S0=0 &F9 &W0 <CR>

This string selects the factory default parameters, then turns auto-answer off and stores that setting, along with all other current parameters, in nonvolatile memory. The &F9 command causes the modem to load the values from nonvolatile memory the next time it receives the &F command. You will use the same initialization string as before:

AT &F X4 ^M

But now the modem will load the values stored in nonvolatile memory when you turn on the modem and when you issue the ATZ or AT&F reset commands.

Note: Because it clears the command buffer, you should not use ATZ in an initialization string.

3.3.2Other Parameters

The default values for the other parameters in modem configuration menus rarely need changing. They typically include the dialing prefix (ATDT for touch-tone service and ATDP for rotary service), the dialing suffix (^M), the hang-up string (+++ATH0^M), and response messages (RING, NO CARRIER, BUSY, etc.). Communications software with a host mode might also include an auto- answer string (AT S0=1^M).

3.4Configuring Software for Your Computer

You must configure your communications software to match your computer’s configuration. If the modem is connected to the COM2 serial port, you must tell the software you are using COM2. Another important parameter is the serial port baud rate. This is the speed at which your modem communicates with your computer, not the speed at which your modem communicates with another modem. When V.42bis data compression is enabled, you must have a serial port baud rate four times the transmission speed of the modem to fully optimize compression.

Multi-Tech Systems, Inc. MT2834BA/BL Series User Guide

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Contents User Guide Trademarks User GuideRecord of Revisions Date Description PatentsContents Index 117 RegistersIntroduction and Description Introduction How To Use This ManualModem Features Fax Features 1 MT2834BA/BL Series FeaturesTechnical Specifications Power MT2834BA LED Display Modem LED IndicatorsControls on PC Board Installation and Connection Installation Procedure What Is in Your Modem Package?Installation Safety WarningsMultiModemBA Connections Is Your Modem Ready for Use? Installing PhoneTools, the Data Communications SoftwareSoftware Configuration and Modem Basics PC Initialization Strings Configuring Your SoftwareConfiguring Software for Your Modem Software ConfigurationAT &F S0=0 &F9 &W0 CR Changing Default ParametersConfiguring Software for Your Computer Other ParametersModem Basics Answer/Originate Voice/Data Toggle SwitchSimple Operations Manual Dial and Automatic Answer Manual Dial and Automatic Answer Dialing/On-Line/AnsweringDial Backup and Leased Line Restoral Manual Dial Backup Call TerminationAutomatic Leased Line Restoral Operation Manual Call Origination Dial-Up OperationManual Answering Automatic AnsweringHandshaking Details Abort TimerCall Termination Command Mode Command Mode AT Command EditingFunctional Modes Functional Modes Summary of AT CommandsStore Modem Configure Data Multi-Tech Result Codes Result CodesStandard AT Result Codes Dialing Action Commands Dialing CommandsSet Pulse Dial Ratios &P Dial Modifier CommandsVoice/Data Dialing $VD Pulse or Tone Dial P TLong Space Disconnect Y Return to Command Mode After Dial Command ExecutionReverse the Mode of Operation R Automatic Pauses in DialingQuiet Answer @ Calling Card Detect Tones $Listing Numbers Stored in Memory L Phone Number Memory CommandsStoring Phone Numbers D...N Number Linking NNLoading Factory Defaults &F Configuration and Default Storage CommandsModem Reset Z Unix Uucp Spoofing $SP Async/Sync Mode Switching &MSynchronous Transmit Clock Select &X Result Codes Multi-Tech or Standard AT &Q Command Response Result Code CommandsEcho Command Mode Characters E Result Codes Enable/Disable and No Response Answer QResult Codes Basic and Extended and Call Progress Selection Bell/V.21 Tone Phone Line Conditioning CommandsEnable/Disable Trelis Coded Modulation #T Guard Tones Not Used in BAI/BLI Models &GAuto Speed Detect #A Fallback Modes When On-Line #FEnable/Disable Lowspeed Fast Connect $FC Cleardown at Disconnect &CDCTS Control &R 7 RS-232C Interface Control CommandsCarrier Detect Control &C Data Terminal Ready Control &DCTS/RTS Interaction Control &RF Data Set Ready Control &SDSR/CD Interaction Control &SF Reliable Mode &E2 Error Correction CommandsNormal Mode &E0 Auto-Reliable Mode &E1Auto-Reliable Buffering $A Mode Select #LError Correction/300bps $E Enable/Disable Auto Reliable Fallback Character $FRetransmit Count $R Hardware Flow Control &E4 Flow Control CommandsXon/Xoff Flow Control &E5 Send Xon/Xoff Characters #X Xon/Xoff Pass-Through &E7Hewlett-Packard ENQ/ACK Pacing &E9 Parity Selection #P Normal Mode Modem Flow Control On &E11Terminal/Computer Initiated Pacing &E13 Maximum Block Size &BSXon/Xoff Pass-Through Commands Normal/Auto-Reliable/Reliable Mode CommandsEnq/Ack Pacing Commands Speed Conversion $BA Speed Conversion CommandsModem Baud Rate $MB Serial Port Baud Rate $SB Immediate Action Commands Off Hook H Listing On-Line Diagnostics L8Force Answer Mode a Line Probe CommandsExiting Command Mode, Going Back On-Line O Registers Return Character Number of Rings Until Modem AnswersRings Which Have Occurred Escape Code CharacterWait Time for Dial Tone Time for Carrier Abort TimerLine Feed Character Backspace CharacterS11 Tone Dialing Tone Spacing and Duration S10 Carrier Loss Disconnect Delay TimeS13 Remote Configuration Escape Character Carrier Detect Response TimeS17 Changing Break Time S15 Callback Time DelayS19 MT2834BL Only Dial-Back Timer S16 Callback AttemptsS25 DTR Dropout Time S26 Failed Password AttemptsS29 Local Inactivity Timer S24 PBX/CBX Disconnect Drop Time for DSR/CTS/CDS37 Time Between DTR Active and Modem On-Hook S30 Inactivity TimerS32 Time Elapse for Escape Sequence S36 Time Between DTR Inactive and Modem Off-HookS48 Program V.34bis Connect Speeds Examples of Assigning Values Reading and Assigning S-Register ValuesExamples of Reading Values AT Command and S-Register Summary Callback Security and Remote Configuration Callback Security and Remote Configuration Callback Feature DescriptionTo change your Remote Configuration feature status Remote Configuration DescriptionAT#CBN0xxxxxxxxxxCR To set parity of the password/message promptCallback Operational Sequence Procedures Remote Configuration Operation Procedures Remote Configuration ProceduresRemote Configuration and Callback Security AT Commands Remote Configuration/Callback Security S-Registers DIP-Switch Settings MT2834BA PC Board Dip-Switch SettingsDIP-Switch Option Settings Switch #4 AS/400 Mode Synchronous Mode/Leased Line/Dial-UP = Down Down Dip-Switch Settings Speaker Volume Control Switch Function Position Effect Recording Option ConfigurationsDIP Switches #15-16 MT2834BA DIP Switches #13-14DIP Switches #15-16 MT2834BL Warranty, Service and Tech Support Warranty, Service, and Technical Support Multi-Tech Systems, Inc. Warranty & Repairs PoliciesRepair Procedures for International Distributors Online Warranty RegistrationCountry Telephone Replacement PartsTechnical Support Internet SitesAppendixes Appendix a Upgrading Your Modem’s Firmware Upgrade OverviewAppendix a Upgrading Your Modem’s Firmware Download the Upgrade File Upgrade the Modem’s Firmware Appendix B Troubleshooting Appendix B TroubleshootingNone of the LEDs Light When the Modem Is On Modem Does Not Respond to CommandsAppendix B Troubleshooting Modem Dials But Cannot Make a Connection Am Losing Data Modem Cannot Connect When AnsweringModem Disconnects While On-line File Transfer Is Slower Than It Should BeAm Getting Garbage Characters on the Monitor Appendix C AT Command Summary Appendix C AT Command SummaryCommand Values Description Multi-Tech Systems, Inc. MT2834BA/BL Series User Guide 100 DsNdMulti-Tech Systems, Inc. MT2834BA/BL Series User Guide 101 $FCn MT2834BLMulti-Tech Systems, Inc. MT2834BA/BL Series User Guide 102 $MBnMulti-Tech Systems, Inc. MT2834BA/BL Series User Guide 103 $SBnMulti-Tech Systems, Inc. MT2834BA/BL Series User Guide 104 Dial ToneCallback Security/Remote Configuration Command Summary 25bis Commands Password Command SummaryAppendix D V.25bis Operation Delayed and Forbidden NumbersAppendix D V.25bis Operation 25bis OperationMulti-Tech Systems, Inc. MT2834BA/BL Series User Guide 108 25bis Mode AT Commands25bis DIP-Switches 25bis Set-Up and Initialization25bis Responses Result Codes 25bis AT CommandsEnable/Disable V.25bis Mode $V Command Change Serial Baud Rate CSP CommandDisregard or Connect to Incoming Calls DIC or CIC Command Dial Phone Number Provided CRN CommandListing Delayed Phone Numbers RLD Command Listing Forbidden Phone Number RLF CommandITU V.25bis Country Specific Information Singapore Appendix D V.25bis Operation BelgiumMulti-Tech Systems, Inc. MT2834BA/BL Series User Guide 112 Appendix E MultiModemBA/BL Cables Appendix E MultiModemBA CablesFCC Part 68 Telecom Appendix F Regulatory InformationFCC Part Multi-Tech Systems, Inc. MT2834BA/BL Series User Guide 115 Canadian Limitations NoticeMulti-Tech Systems, Inc. MT2834BA/BL Series User Guide 116 South African NoticeMulti-Tech Systems, Inc. MT2834BA/BL Series User Guide 117 IndexMulti-Tech Systems, Inc. MT2834BA/BL Series User Guide 118 91-116Multi-Tech Systems, Inc. MT2834BA/BL Series User Guide 119 PBX/CBX Disconnect Drop Time for DSR/CTS/CD63