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Multi-Tech Systems BL-Series manual External Transmit Clock Pin 24, XTC, 159

Models: BL-Series

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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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Multi-Tech Systems BL-Series manual External Transmit Clock Pin 24, XTC, Terminal Busy Out of Service Pin 25, OOS, 159

Contents

User Guide Record of Revisions User GuideContents Registers Command ModeCallback Security and Remote Configuration Manual Dial and Automatic AnswerAppendixes Modem TestingDIP-Switch Settings Warranty, Service and Tech SupportPage Introduction and Description Introduction How To Use This ManualDIP-Switches AT Command Mode OperationCallback and Remote Configuration Testing Your ModemModem Features 1 2834 Series Features2 1932 Series Features Fax Features 3 1432 Series FeaturesTechnical Specifications Introduction and Description Mode of OperationIntelligent Features Command BufferCarrier Frequencies 300 bps Bell Standard Fax Carrier FrequenciesLease Line Restoral Carrier FrequenciesOperating Temperature ConnectorsDiagnostics IndicatorsPower Modem LED IndicatorsModels Only Controls on PC Board MultiModemBL User Guide Installation and Connection Unpacking MT2834BL shown What is in Your Modem Package?Installation Safety WarningsInstallation Procedure MultiModemBL/BLI Connections MultiModemBLK Connections Cabling Procedure MT1432BLK and MT2834BLKLoading Trio DataFAX Software Installation and Connection Is Your Modem Ready for Use? Software Configuration and Modem Basics How Can You Identify Your Uart Type? Serial Port Limitations16550 Uart and Windows Configuring Your SoftwareConfiguring Software for Your Modem Software ConfigurationChanging Default Parameters PC Initialization StringsOther Parameters Terminal Emulation Configuring Software for Your ComputerConfiguring Software for the Remote System Macintosh InitializationAT &F S0=0 X4 &E14 M When to Disable Data CompressionDisabling Error Correction File Transfer ProtocolsAnswer/Originate Voice/Data Toggle Switch Modem BasicsSimple Operations MultiModemBL User Guide Manual Dial and Automatic Answer Dialing/On-Line/Answering Manual Dial and Automatic Answer Manual Dial Backup Call TerminationDial Backup and Leased Line Restoral Automatic Leased Line Restoral OperationManual Call Origination Dial-Up OperationManual Answering Automatic AnsweringAbort Timer Handshaking DetailsCall Termination Command Mode AT Command Editing Functional Modes Command ModeSummary of AT Commands Flow Control Disabled Normal ModeAuto-Reliable Mode Reliable ModeCallback Security Enable/Disable Enable/Disable Reading Line Probe From DSP during handshakeDisplay of Signal Strength Information Passwords for Callback Phone NumbersMulti-Tech Result Codes Series Result CodesMultiModemBL User Guide Standard AT Result Codes Series Dialing a Stored Number N Dialing Commands Dialing Action CommandsDial Command D Continuous Redial not used in BLI/BLK a orSet Pulse Dial Ratios &P Not used in BLK 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 NNConfiguration 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 QResult Codes Basic and Extended and Call Progress Selection Bell/V.21 Tone Not Used in BLK Models B Phone Line Conditioning CommandsEnable/Disable Trelis Coded Modulation #T Guard Tones Not Used in BLI or BLK Models &GFallback 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 &DData Set Ready Control &S CTS/RTS Interaction Control &RFDSR/CD Interaction Control &SF Reliable Mode &E2 Error Correction CommandsNormal Mode &E0 Auto-Reliable Mode &E1Auto-Reliable Buffering $A Mode Select #LOriginate Mode Answer ModeEnable/Disable Auto Reliable Fallback Character $F Error Correction/300bps $ERetransmit Count $R Modem-Initiated Flow Control Flow Control CommandsHardware Flow Control &E4 Xon/Xoff Flow Control &E5Xon/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 &BSNormal/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 L8Line Probe Commands 2834 Series only Force Answer Mode aExiting Command Mode, Going Back On-Line O MultiModemBL User Guide 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 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 2834 Series only Reading and Assigning S-Register Values Examples of Assigning ValuesExamples of Reading Values AT Command and S-Register Summary 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 ProceduresChange Login Password Remote Configuration and Callback Security AT CommandsAssign Passwords for Callback Phone Numbers #CBN Callback Security Enable/DisableErase Callback Phone Number #RDNxx Erase Callback PasswordRemote Configuration/Callback Security S-Registers MultiModemBL User Guide Modem Testing Introduction Local Analog Loopback Test/V.54 Loop Modem Testing100 Digital Loopback Test/V.54 Loop 2 Local/Manual101 Digital Loopback Test/V.54 Loop 2 Remote/Automatic4A. Back-to-Back Test Cabling Back-to-Back TestLocal Analog Loopback Test Synchronous Mode Synchronous Mode TestingSynchronous Mode Digital Loopback Test local/manual 104 Digital Loopback Test Local/Manual Synchronous ModeSynchronous Mode Digital Loopback Test remote/automatic 105 Digital Loopback Test Remote/Automatic Synchronous ModeMultiModemBL User Guide 106 DIP-Switch Settings PC Board BL models 108 DIP-Switch Option Settings DIP-Switch Settings109 Switch #4 AS/400 Mode Synchronous Mode/Leased Line/Dial-UP 1432 Series110 111 112 113 Speaker Volume Control MultiModemBL User Guide Series114 Recording Option Configurations Switch Function Position Effect115 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 SupportMulti-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 MultiModemAbout 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 Commands125 Appendix a Troubleshooting126 Modem Dials But Cannot Make a Connection127 Modem Cannot Connect When AnsweringModem Disconnects While On-line File Transfer Is Slower Than It Should BeAm Losing Data Am Getting Garbage Characters on the Monitor128 129 Appendix B Ascii Conversion Chart130 Appendix C Dial Pulse and Tone-Dial FrequenciesDial Pulses Tone Dial Frequencies#An Appendix D AT Command SummaryCommand Values Description $AnSN d BS n$BA n CD n$Fn $EBn#Fn $FCn$MBn $HnL10 #LnSr=n NdNe$Rn RFn#Tn $SBnSFn $SPn#Xn +++ATCR137 Callback Security/Remote Configuration Command Summary 25bis Commands Password Command SummaryAppendix E DIP-Switch Summary Asynchronous Mode140 Synchronous Mode Appendix E DIP-Switch Summary141 142 Appendix F S-Register Summary S29 S24S25 S26145 Appendix G Result Code SummaryAppendix G Result Code Summary Terse Digit Verbose Words Effect146 Appendix H V.25bis Operation Delayed and Forbidden NumbersAppendix H V.25bis Operation 25bis Operation25bis 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 CommandDTR Dialing $D Command Listing Delayed Phone Numbers RLD CommandListing Forbidden Phone Number RLF Command Disregard or Connect to Incoming Calls DIC or CIC CommandAustria ITU V.25bis Country Specific InformationItaly Switzerland153 Appendix H V.25bis Operation FranceBelgium SingaporeFigure I-1. RS232 Cable IBM PC Appendix I MultiModemBL CablesFigure I-4. MAC Cable 155 Appendix J RS-232C Interface Specifications156 Appendix J RS-232C Interface SpecificationsSignal Function Assignment Circuit Source Pin Designation EiaClear To Send Pin 5, CTS CB Signal Ground Pin 7, SG ABReceived Data Pin 3, RD BB Request To Send Pin 4, RTS CAReceive Clock Pin 17, RC DD Ring Indicator Pin 22, RI CETest Voltage Pin 9 Transmit Clock Pin 15, TC DBTerminal Busy Out of Service Pin 25, OOS External Transmit Clock Pin 24, XTC159 160 Appendix K Regulatory Information EMC, Safety and Terminal Directive ComplianceCompliance with European Community Requirements European Directives User Guide StatementInternational Modem Restrictions New Zealand Telecom Warning Notice162 163 FCC Regulations for Telephone Line InterconnectionIndustry Canada Canadian Limitations NoticeClass a Statement FCC Part165 Index166 Functional Description of RS232C SIG167 XON/XOFF 168