Multi-Tech Systems BA-Series manual Dial Modifier Commands, DTR Dialing $D, Voice/Data Dialing $VD

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MultiModemBA User Guide

DTR Dialing $D

An alternate method of causing the modem to automatically dial is DTR Dialing. Data Terminal Ready (DTR) is a signal that comes into the modem from the terminal or computer to which it is connected, on pin 20 of the RS-232C interface. In DTR dialing, the modem automatically dials a stored number as soon as it receives a high DTR Signal. The DTR dialing method is popular in synchronous applications.

To activate DTR Dialing, enter AT$D1 and hit RETURN. The modem dials the phone number stored in the N0 location of memory when it receives a high DTR signal. DTR must remain high for the duration of the call, until disconnect. To deactivate DTR dialing, enter AT$D0 and hit RETURN.

Note when using DTR Dialing in a synchronous application, be sure DIP-Switch #8 is in the UP position to disable V.25bis Command mode.

Voice/Data Dialing $VD

Another alternate method of causing the modem to automatically dial is Voice/Data Dialing. With Voice/Data Dialing, the modem automatically dials the phone number stored in the N1 position of memory whenever the Voice/Data switch is toggled. You must first enter AT$VD1&W0<CR>. This command string enables Voice/Data dialing when the Voice/Data toggle switch is activated. To disable Voice/Data Dialing (default), enter the command AT$VD0 W0<CR>.

4.4.2Dial Modifier Commands

There are several command characters that can be included within a dialing command (following the letter D), called “Dial Modifiers”. They have various functions, including the selection of Pulse or Tone Dialing, pauses in the dial sequence, automatic re-dials if a number is busy, and reverting to the Command mode or switching to the Answer mode after dialing.

Pulse or Tone Dial P T

The modem dials numbers using either pulse or tone dialing, or a combination of both methods. Pulse dialing is a method used by rotary-dial telephones, which involves the timed opening and closing of line relay.

Tone dialing is the method used by push-button (touch tone) telephones, and is sometimes referred to as DTMF, or Dual-Tone Multi-Frequency dialing.

The method used is selected by including a P for Pulse or a T for Tone in the dialing command, right before the digits you wish to have dialed in that manner.

For example, you would pulse-dial the number 555-1212 by entering ATDP5551212 and hitting RETURN. You could tone-dial the same number by entering ATDT5551212 and hitting RETURN. If neither Pulse nor Tone dialing is specified in the dial command, the modem uses whatever method used last. If the modem has been reset or just powered up, it uses Pulse dialing, even if the letter P is not included in your dial command.

Nearly all telephone systems in the U.S. are now compatible with tone dialing. Since that is the faster method, you will probably choose the tone method for your dialing.

An example of combining pulse and tone dialing could involve a PBX system where 9 had to be pulse-dialed first, then the rest of the number tone-dialed after pausing for a second dial tone. The number would be dialed by entering ATDP9, T5551212 and RETURN. (The comma causes a pause, which we’ll explain soon.)

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Contents User Guide User Guide Record of RevisionsContents Index 106 Introduction and Description How To Use This Manual IntroductionModem Features Callback and Remote ConfigurationDIP-Switches Warranty, Service & Technical Support1 2834 Series Features Fax FeaturesTechnical Specifications Power Modem LED Indicators MT2834 LED DisplayControls on PC Board Installation and Connection What is in Your Modem Package? InstallationSafety Warnings Installation ProcedureInstallation and Connection Step ProcedureInstalling Data Communications Software MultiModemBA/BAI ConnectionsSoftware Configuration and Modem Basics Configuring Your Software Configuring Software for Your ModemPC Initialization Strings AT &F X4 S0=0 MChanging Default Parameters Configuring Software for Your ComputerConfiguring Software for the Remote System Other ParametersTerminal Emulation File Transfer ProtocolsCommand Mode AT Command Editing Functional ModesSummary of AT Commands Command ModeStore Modem Configure Data Multi-Tech Result Codes Result CodesStandard AT Result Codes Dialing Commands Dialing Action Commands Dial Command DContinuous Redial not used in BAI a or Dialing a Stored Number NDial Modifier Commands DTR Dialing $DVoice/Data Dialing $VD Pulse or Tone Dial P TReturn to Command Mode After Dial Command Execution Reverse the Mode of Operation RSet Pulse Dial Ratios &P Automatic Pauses in DialingPhone Number Memory Commands Flash On HookCalling Card Detect Tones $ Quiet Answer @Number Linking NN Configuration and Default Storage CommandsListing Numbers Stored in Memory L Loading Factory Defaults &F Modem Reset ZAsync/Sync Mode Switching &M Unix Uucp Spoofing $SPCommand Response Result Code Commands Echo Command Mode Characters EResult Codes Enable/Disable and No Response Answer Q Result Codes Multi-Tech or Standard AT &QResult Codes Basic and Extended and Call Progress Selection Phone Line Conditioning CommandsGuard Tones Not Used in BAI Models &G Enable/Disable Trelis Coded Modulation #T Fallback Modes When On-Line #FBell/V.21 Tone Phone Line Monitoring Speaker M7 RS-232C Interface Control Commands Enable/Disable Lowspeed Fast Connect $FCCleardown at Disconnect &CD Auto Speed Detect #AData Terminal Ready Control &D CTS Control &RData Set Ready Control &S CTS/RTS Interaction Control &RFError Correction Commands Enable/Disable Auto Reliable Fallback Character $F Auto-Reliable Buffering $AError Correction/300bps $E Flow Control CommandsRetransmit Count $R Xon/Xoff Flow Control &E5 Hardware Flow Control &E4Xon/Xoff Pass-Through &E7 Normal Mode Modem Flow Control On &E11 Send Xon/Xoff Characters #XHewlett-Packard ENQ/ACK Pacing &E9 Terminal/Computer Initiated Pacing &E13Normal/Auto-Reliable/Reliable Mode Commands Xon/Xoff Pass-Through CommandsEnq/Ack Pacing Commands Parity Selection #PSpeed Conversion $BA Speed Conversion CommandsModem Baud Rate $MB Serial Port Baud Rate $SB Immediate Action Commands Force Answer Mode a Off Hook HLine Probe Commands Exiting Command Mode, Going Back On-Line OEnable/Disable Reading of Line Probe Information Commands Format of Line Probe Graph or Table CommandsRegisters Number of Rings Until Modem Answers Rings Which Have OccurredEscape Code Character Return CharacterTime for Carrier Abort Timer Line Feed CharacterBackspace Character Wait Time for Dial ToneS10 Carrier Loss Disconnect Delay Time S13 Remote Configuration Escape CharacterCarrier Detect Response Time S11 Tone Dialing Tone Spacing and DurationS15 Callback Time Delay S16 Callback AttemptsS17 Changing Break Time S24 PBX/CBX Disconnect Drop Time for DSR/CTS/CDS26 Failed Password Attempts S29 Local Inactivity TimerS30 Inactivity Timer S32 Time Elapse for Escape SequenceReading and Assigning S-Register Values S36 Time Between DTR Inactive and Modem Off-HookS37 Time Between DTR Active and Modem On-Hook S48 Program V.34bis Connect Speeds 2834 Series onlyExamples of Assigning Values AT Command and S-Register SummaryExamples of Reading Values Callback Security and Remote Configuration Callback Feature Description Remote Configuration DescriptionTo turn your modems Callback Security feature on and off To change your Remote Configuration feature statusTo set parity of the password/message prompt AT#DB2CR or AT#DB1CR Remote Configuration Procedures Callback Security and Remote ConfigurationCallback Operational Sequence Procedures Remote Configuration Operation Procedures StepProcedureRemote Configuration and Callback Security AT Commands Callback Security Enable/DisableChange Login Password AT#I=yyyyyyyyyyCRRemote Configuration/Callback Security S-Registers Local Inactivity Timer S29 DIP-Switch Settings DIP-Switch Option Settings PC BoardSwitch #4 AS/400 Mode Synchronous Mode/Leased Line/Dial-UP DIP-Switch SettingsMultiModemBA User Guide = Down Down Speaker Volume Control Switch #16 Reserved for Future UseRecording Option Configurations Switch Function Position EffectDIP Switches #13-14 DIP Switches #15-16Warranty, Service and Tech Support Multi-Tech Systems, Inc. Warranty & Repairs Policies Warranty, Service, and Technical SupportOnline Warranty Registration Repair Procedures for International DistributorsReplacement Parts Technical SupportInternet Sites Country TelephoneAppendixes Upgrade Overview Appendix a Upgrading Your Modem’s FirmwareDownload the Upgrade File Upgrade the Modem’s Firmware None of the LEDs Light When the Modem Is On Appendix B TroubleshootingModem Does Not Respond to Commands Appendix B Troubleshooting Modem Dials But Cannot Make a Connection Modem Cannot Connect When Answering Modem Disconnects While On-lineFile Transfer Is Slower Than It Should Be Am Losing DataAm Getting Garbage Characters on the Monitor Appendix C AT Command Summary Apendix C AT Command SummaryCommand Values Description MultiModemBA User Guide Command Values Description SN d$Fn RF n $SBn Break Atcr Callback Security/Remote Configuration Command Summary Command Description #Ixxxxxxxxxx Password Command Summary#Syyyyyyyyyy 25bis Commands Appendix D V.25bis Operation Delayed and Forbidden Numbers25bis Operation 25bis Mode AT Commands 25bis DIP-Switches25bis Set-Up and Initialization Appendix D V.25bis Operation25bis AT Commands Enable/Disable V.25bis Mode $V CommandChange Serial Baud Rate CSP Command 25bis Responses Result CodesDial Phone Number Provided CRN Command Listing Delayed Phone Numbers RLD CommandListing Forbidden Phone Number RLF Command Disregard or Connect to Incoming Calls DIC or CIC CommandDTR Dialing $D Command ITU V.25bis Country Specific InformationItaly SwitzerlandAppendix E MultiModemBA Cables Austria FranceBelgium SingaporeAppendix E MultiModemBA Cables Figure E-1. RS232 Cable IBM PCAppendix F Regulatory Information FCC Part FCC Part 68 TelecomAppendix F Regulatory Information Industry CanadaCanadian Limitations Notice 104International Modem Restrictions EMC, Safety, and R&TTE Directive Compliance105 Index 106Index 107PBX/CBX Disconnect Drop Time for DSR/CTS/CD53 108109
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