External Transmit Clock Pin 24, XTC, 159

Appendix J - RS-232C Interface Specifications

External Transmit Clock - Pin 24, XTC

Direction: to modem

Supplies the same function as transmit clock on Pin 15.

Terminal Busy (Out of Service) - Pin 25, OOS

Direction: to modem

The Terminal Busy (OOS) circuit is not defined in the RS-232C standard, but is used by us and most manufacturers to make the phone lines busy to incoming phone calls. Pin 25 is not normally connected to the RS-232C interface when shipped from the factory; it can be ordered connected as an option. If pin 25 is connected and is brought high, the modem will be placed Off Hook, and busy to incoming calls.

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Image 159

Multitech MT1432BA, MT2834BAI manual External Transmit Clock Pin 24, XTC, Terminal Busy Out of Service Pin 25, OOS, 159

Contents

User Guide Record of Revisions User Guide Contents Registers Command ModeCallback Security and Remote Configuration Manual Dial and Automatic Answer Appendixes Modem TestingDIP-Switch Settings Warranty, Service and Tech SupportPage Introduction and Description Introduction How To Use This Manual DIP-Switches AT Command Mode OperationCallback and Remote Configuration Testing Your Modem 3 932 Series Features Modem Features1 2834 Series Features 2 1432 Series Features Fax Features Technical Specifications Introduction and Description Mode of OperationIntelligent Features Command Buffer Transmit Level Fax Carrier FrequenciesCarrier Frequencies Carrier Frequencies 300 bps Bell Standard Operating Temperature ConnectorsDiagnostics Indicators Power Modem LED IndicatorsModels Only Controls on PC Board MultiModemBA User Guide Installation and Connection Unpacking MT2834BA shown What is in Your Modem Package? Installation Safety WarningsInstallation Procedure MultiModemBA/BAI Connections Loading Trio DataFAX Software MultiModemBA User Guide Is Your Modem Ready for Use? MultiModemBA User Guide Software Configuration and Modem Basics How Can You Identify Your Uart Type? Serial Port Limitations 16550 Uart and Windows Configuring Your SoftwareConfiguring Software for Your Modem Software Configuration Changing Default Parameters PC Initialization StringsOther Parameters Terminal Emulation Configuring Software for Your ComputerConfiguring Software for the Remote System Macintosh Initialization AT &F S0=0 X4 &E14 M When to Disable Data CompressionDisabling Error Correction File Transfer Protocols Answer/Originate Voice/Data Toggle Switch Modem BasicsSimple Operations MultiModemBA User Guide Manual Dial and Automatic Answer Dialing/On-Line/Answering Manual Call Origination Automatic AnsweringManual Dial and Automatic Answer Handshaking Details Manual Answering Call Termination Abort Timer MultiModemBA User Guide Command Mode AT Command Editing Functional Modes Command Mode Summary of AT Commands Flow Control Disabled Normal ModeAuto-Reliable Mode Reliable Mode Callback Security Enable/Disable Enable/Disable Reading Line Probe From DSP during handshakeDisplay of Signal Strength Information Passwords for Callback Phone Numbers Multi-Tech Result Codes Series Result Codes MultiModemBA User Guide Standard AT Result Codes Series Dialing a Stored Number N Dialing Commands Dialing Action CommandsDial Command D Continuous Redial not used in BAI a or Set Pulse Dial Ratios &P Dial Modifier CommandsVoice/Data Dialing $VD Pulse or Tone Dial P T Long Space Disconnect Y Return to Command Mode After Dial Command ExecutionReverse the Mode of Operation R Automatic Pauses in Dialing Quiet Answer @ Calling Card Detect Tones $ Listing Numbers Stored in Memory L Phone Number Memory CommandsStoring Phone Numbers D...N Number Linking NN Configuration and Default Storage Commands Loading Factory Defaults &FModem Reset Z Async/Sync Mode Switching &M Unix Uucp Spoofing $SPSynchronous 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 Q Result 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 Models &G Fallback Modes When On-Line #F Enable/Disable Lowspeed Fast Connect $FC 2834 Series onlyCleardown at Disconnect &CD 2834 Series only Auto Speed Detect #A CTS Control &R 7 RS-232C Interface Control CommandsCarrier Detect Control &C Data Terminal Ready Control &D Data Set Ready Control &S CTS/RTS Interaction Control &RFDSR/CD Interaction Control &SF Reliable Mode &E2 Error Correction CommandsNormal Mode &E0 Auto-Reliable Mode &E1 Auto-Reliable Buffering $A Mode Select #LOriginate Mode Answer Mode Enable/Disable Auto Reliable Fallback Character $F Error Correction/300bps $ERetransmit Count $R Flow Control Commands Hardware Flow Control &E4Xon/Xoff Flow Control &E5 Xon/Xoff Pass-Through &E7 Send Xon/Xoff Characters #XHewlett-Packard ENQ/ACK Pacing &E9 Parity Selection #P Normal Mode Modem Flow Control On &E11Terminal/Computer Initiated Pacing &E13 Maximum Block Size &BS Normal/Auto-Reliable/Reliable Mode Commands Xon/Xoff Pass-Through CommandsEnq/Ack Pacing Commands Speed Conversion Commands Speed Conversion $BAModem Baud Rate $MB Command Mode Series Serial Port Baud Rate $SB Immediate Action Commands Off Hook H Listing On-Line Diagnostics L8 Line Probe Commands 2834 Series only Force Answer Mode aExiting Command Mode, Going Back On-Line O MultiModemBA User Guide Registers Return Character Number of Rings Until Modem AnswersRings Which Have Occurred Escape Code Character Wait Time for Dial Tone Time for Carrier Abort TimerLine Feed Character Backspace Character S11 Tone Dialing Tone Spacing and Duration S10 Carrier Loss Disconnect Delay TimeS13 Remote Configuration Escape Character Carrier Detect Response Time S24 PBX/CBX Disconnect Drop Time for DSR/CTS/CD S15 Callback Time DelayS16 Callback Attempts S17 Changing Break Time S32 Time Elapse for Escape Sequence S26 Failed Password AttemptsS29 Local Inactivity Timer S30 Inactivity Timer S36 Time Between DTR Inactive and Modem Off-Hook S37 Time Between DTR Active and Modem On-HookS48 Program V.34bis Connect Speeds 2834 Series only Reading and Assigning S-Register Values Examples of Assigning ValuesExamples of Reading Values AT Command and S-Register Summary MultiModemBA User Guide Callback Security and Remote Configuration Callback Feature Description Remote Configuration Description Callback Security and Remote ConfigurationTo change your Remote Configuration feature status To set parity of the password/message prompt AT#CBN0xxxxxxxxxxCRAT#CBN1xxxxxxxxxxCR Callback Operational Sequence Procedures Remote Configuration Operation Procedures StepProcedure Remote Configuration Procedures Change Login Password Remote Configuration and Callback Security AT CommandsAssign Passwords for Callback Phone Numbers #CBN Callback Security Enable/Disable Erase Callback Phone Number #RDNxx Erase Callback Password Remote Configuration/Callback Security S-Registers MultiModemBA User Guide Modem Testing Introduction Local Analog Loopback Test/V.54 Loop Modem Testing 100 Digital Loopback Test/V.54 Loop 2 Local/Manual 101 Digital Loopback Test/V.54 Loop 2 Remote/Automatic 4A. Back-to-Back Test Cabling Back-to-Back Test Local Analog Loopback Test Synchronous Mode Synchronous Mode Testing Synchronous Mode Digital Loopback Test local/manual 104 Digital Loopback Test Local/Manual Synchronous Mode Synchronous Mode Digital Loopback Test remote/automatic 105 Digital Loopback Test Remote/Automatic Synchronous Mode MultiModemBA User Guide 106 DIP-Switch Settings PC Board 108 DIP-Switch Option Settings DIP-Switch Settings109 Switch #4 AS/400 Mode Synchronous Mode/Leased Line/Dial-UP 932 Series110 111 112 113 Switch #16 Reserved for Future Use MultiModemBA User Guide Series114 115 Speaker Volume ControlRecording Option Configurations Switch Function Position Effect DIP Switches #13-14 DIP Switches #15-16116 Warranty, Service and Tech Support Limited Warranty On-line Warranty Registration118 Recording Modem Information ServiceWarranty, Service and Tech Support Tech Support Multi-Tech BBS To log on to the Multi-Tech BBSTo Download a file About Multi-Tech’s Internet Presence Using FlashPro to Upgrade Modem FirmwareAbout the Multi-Tech Fax-Back Service Upgrading the MultiModem About Ordering Accessories SupplyNet Online Ordering Instructions122 Appendixes 124 Appendix a TroubleshootingNone of the LEDs Light When the Modem Is On Modem Does Not Respond to Commands 125 Appendix a Troubleshooting 126 Modem Dials But Cannot Make a Connection 127 Modem Cannot Connect When AnsweringModem Disconnects While On-line File Transfer Is Slower Than It Should Be Am Losing Data Am Getting Garbage Characters on the Monitor128 129 Appendix B Ascii Conversion Chart 130 Appendix C Dial Pulse and Tone-Dial FrequenciesDial Pulses Tone Dial Frequencies #An Appendix D AT Command SummaryCommand Values Description $An SN d BS n$BA n CD n 133 $EBn#Fn $Fn 134 $Hn#Ln $MBn Sr=n NdNe$Rn RFn #Tn $SBnSFn $SPn $VDn #Xn137 +++ATCR Callback Security/Remote Configuration Command Summary 25bis Commands Password Command Summary Appendix E DIP-Switch Summary Asynchronous Mode140 Synchronous Mode Appendix E DIP-Switch Summary141 142 Appendix F S-Register Summary S34 S29S30 S32 145 Appendix G Result Code SummaryAppendix G Result Code Summary Terse Digit Verbose Words Effect 146 Appendix H V.25bis Operation Delayed and Forbidden NumbersAppendix H V.25bis Operation 25bis Operation 25bis DIP-Switches 25bis Set-Up and Initialization148 25bis Mode AT Commands 25bis Responses Result Codes149 Dial Phone Number Provided CRN Command 25bis AT CommandsEnable/Disable V.25bis Mode $V Command Change Serial Baud Rate CSP Command DTR Dialing $D Command Listing Delayed Phone Numbers RLD CommandListing Forbidden Phone Number RLF Command Disregard or Connect to Incoming Calls DIC or CIC Command Austria ITU V.25bis Country Specific InformationItaly Switzerland 153 Appendix H V.25bis Operation FranceBelgium Singapore Figure I-1. RS232 Cable IBM PC Appendix I MultiModemBA Cables Figure I-2. MAC Cable 155 Appendix J RS-232C Interface Specifications 156 Appendix J RS-232C Interface SpecificationsSignal Function Assignment Circuit Source Pin Designation Eia Clear To Send Pin 5, CTS CB Signal Ground Pin 7, SG ABReceived Data Pin 3, RD BB Request To Send Pin 4, RTS CA Receive Clock Pin 17, RC DD Ring Indicator Pin 22, RI CETest Voltage Pin 9 Transmit Clock Pin 15, TC DB Terminal Busy Out of Service Pin 25, OOS External Transmit Clock Pin 24, XTC159 European Directives User Guide Statement EMC, Safety and Terminal Directive ComplianceInternational Modem Restrictions New Zealand Telecom Warning Notice FCC Regulations for Telephone Line Interconnection Appendix K Regulatory Information161 Industry Canada Canadian Limitations NoticeClass a Statement FCC Part 163 Index 164 Functional Description of RS232C SIG 165 166

Multitech MT1432BA External Transmit Clock Pin 24, XTC, Terminal Busy Out of Service Pin 25, OOS

Models: MT2834BAI MT1432BA MT2834BA

Appendix J - RS-232C Interface Specifications

External Transmit Clock - Pin 24, XTC

Direction: to modem

Terminal Busy (Out of Service) - Pin 25, OOS

Direction: to modem

159