Multi-Tech Systems BA-Series Send Xon/Xoff Characters #X, Hewlett-Packard ENQ/ACK Pacing &E9

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MultiModemBA User Guide

Send Xon/Xoff Characters #X

The #X phone interface command allows the modem to send either a single or multiple Xoff characters at the modem's buffer full level. When the modem’s buffer reaches it's "buffer full" level, the next character received causes another Xoff to be sent for every character subsequently received by the modem.

The AT#X0 command (factory default setting) causes one Xoff to be sent until the buffer reaches the Xon level. The AT#X1 command causes an Xoff to be sent for every character received after the modem reaches its buffer full level.

Hewlett-Packard ENQ/ACK Pacing &E9

If the modem is being used with Hewlett Packard (or similar) equipment that employs ENQ/ACK pacing, the modem can be configured to respond to ENQ/ACK commands, making it compatible with HP systems. Doing so does not affect any other flow control or pacing already configured in the modem.

When configured for ENQ/ACK, the ENQ (Control-E) and ACK (Control-F) signals from the HP equipment will be accepted and responded to according to Hewlett-Packard protocol.

Normal Mode Modem Flow Control On &E11

When two MultiModems are connected in Normal mode (not using error correction), Xon/Xoff can be used to control the flow of data between the modems. Flow Control can be turned on or off with the Normal Mode Modem Flow Control commands. When the modems are connected in Reliable mode, a different method of modem flow control is used, and the commands for Normal Mode Modem Flow Control are ignored.

When you are using Speed Conversion in Normal Mode, you must activate the modem’s Normal Mode Modem Flow Control.

Terminal/Computer Initiated Pacing &E13

As mentioned earlier, the modem can initiate flow control by issuing Xon/Xoff commands or toggling the CTS signal on the RS-232C interface. The modem can also be configured to react to similar commands and signals from the computer or terminal to which it is attached via the RS-232C interface. We refer to the computer or terminal initiated flow control as Pacing. When the modem is set for Pacing On, the modem will respond to the terminal or computer pacing. When the modem is set for Pacing Off, it will ignore pacing.

In order for the modem to be set for Pacing On, a modem-initiated method of flow control must be previously selected. Once this is done, the modem will respond to either Xon/Xoff commands, or to the toggling of the RTS (Request to Send) signal on Pin 4 of the RS-232C interface, depending on what you selected earlier as your Modem-Initiated Flow Control method.

Maximum Block Size &BS

The maximum size of Reliable mode data blocks can be controlled with the &BS command. MNP 3 sends blocks of 1 to 64 characters. MNP 4 and 5 typically send blocks of 1 to 256 characters and LAP-M typically send 128 characters. For MNP Classes 4 and 5/LAP-M, reducing the block size to 64 characters may give a smoother flow of data, and better throughput on noisy phone lines. Using smaller block sizes over good phone lines may cause a slight loss in throughput (speed).

AT&BS0 = Maximum transmit block size of 64 characters

AT&BS1 = Maximum transmit block size of 128 characters (LAP-M) 256 characters (MNP)

The factory default setting is &BS1.

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Contents User Guide User Guide Record of RevisionsContents Index 106 Introduction and Description How To Use This Manual IntroductionDIP-Switches Modem FeaturesCallback and Remote Configuration 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? InstallationInstallation and Connection Safety WarningsInstallation Procedure Step ProcedureInstalling Data Communications Software MultiModemBA/BAI ConnectionsSoftware Configuration and Modem Basics PC Initialization Strings Configuring Your SoftwareConfiguring Software for Your Modem AT &F X4 S0=0 MConfiguring Software for the Remote System Changing Default ParametersConfiguring Software for Your Computer Other ParametersTerminal Emulation File Transfer ProtocolsCommand Mode AT Command Editing Functional ModesSummary of AT Commands Command ModeStore Modem Configure Data Result Codes Multi-Tech Result CodesStandard AT Result Codes Continuous Redial not used in BAI a or Dialing Commands Dialing Action CommandsDial Command D Dialing a Stored Number NVoice/Data Dialing $VD Dial Modifier CommandsDTR Dialing $D Pulse or Tone Dial P TSet Pulse Dial Ratios &P Return to Command Mode After Dial Command ExecutionReverse the Mode of Operation R Automatic Pauses in DialingCalling Card Detect Tones $ Phone Number Memory CommandsFlash On Hook Quiet Answer @Configuration and Default Storage Commands Number Linking NNListing Numbers Stored in Memory L Async/Sync Mode Switching &M Loading Factory Defaults &FModem Reset Z Unix Uucp Spoofing $SPResult Codes Enable/Disable and No Response Answer Q Command Response Result Code CommandsEcho Command Mode Characters E Result Codes Multi-Tech or Standard AT &QPhone Line Conditioning Commands Result Codes Basic and Extended and Call Progress SelectionGuard Tones Not Used in BAI Models &G Bell/V.21 Tone Enable/Disable Trelis Coded Modulation #TFallback Modes When On-Line #F Phone Line Monitoring Speaker MCleardown at Disconnect &CD 7 RS-232C Interface Control CommandsEnable/Disable Lowspeed Fast Connect $FC Auto Speed Detect #AData Set Ready Control &S Data Terminal Ready Control &DCTS Control &R CTS/RTS Interaction Control &RFError Correction Commands Enable/Disable Auto Reliable Fallback Character $F Auto-Reliable Buffering $AFlow Control Commands Error Correction/300bps $ERetransmit Count $R Hardware Flow Control &E4 Xon/Xoff Flow Control &E5Xon/Xoff Pass-Through &E7 Hewlett-Packard ENQ/ACK Pacing &E9 Normal Mode Modem Flow Control On &E11Send Xon/Xoff Characters #X Terminal/Computer Initiated Pacing &E13Enq/Ack Pacing Commands Normal/Auto-Reliable/Reliable Mode CommandsXon/Xoff Pass-Through Commands Parity Selection #PSpeed Conversion Commands Speed Conversion $BAModem Baud Rate $MB Serial Port Baud Rate $SB Immediate Action Commands Force Answer Mode a Off Hook HEnable/Disable Reading of Line Probe Information Commands Line Probe CommandsExiting Command Mode, Going Back On-Line O Format of Line Probe Graph or Table CommandsRegisters Escape Code Character Number of Rings Until Modem AnswersRings Which Have Occurred Return CharacterBackspace Character Time for Carrier Abort TimerLine Feed Character Wait Time for Dial ToneCarrier Detect Response Time S10 Carrier Loss Disconnect Delay TimeS13 Remote Configuration Escape Character S11 Tone Dialing Tone Spacing and DurationS17 Changing Break Time S15 Callback Time DelayS16 Callback Attempts S24 PBX/CBX Disconnect Drop Time for DSR/CTS/CDS30 Inactivity Timer S26 Failed Password AttemptsS29 Local Inactivity Timer S32 Time Elapse for Escape SequenceS37 Time Between DTR Active and Modem On-Hook Reading and Assigning S-Register ValuesS36 Time Between DTR Inactive and Modem Off-Hook S48 Program V.34bis Connect Speeds 2834 Series onlyAT Command and S-Register Summary Examples of Assigning ValuesExamples of Reading Values Callback Security and Remote Configuration Callback Feature Description Remote Configuration DescriptionTo change your Remote Configuration feature status To turn your modems Callback Security feature on and offTo set parity of the password/message prompt AT#DB2CR or AT#DB1CR Callback Operational Sequence Procedures Remote Configuration ProceduresCallback Security and Remote Configuration Remote Configuration Operation Procedures StepProcedureChange Login Password Remote Configuration and Callback Security AT CommandsCallback Security Enable/Disable 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 DistributorsInternet Sites Replacement PartsTechnical Support Country TelephoneAppendixes Upgrade Overview Appendix a Upgrading Your Modem’s FirmwareDownload the Upgrade File Upgrade the Modem’s Firmware Appendix B Troubleshooting None of the LEDs Light When the Modem Is OnModem Does Not Respond to Commands Appendix B Troubleshooting Modem Dials But Cannot Make a Connection File Transfer Is Slower Than It Should Be Modem Cannot Connect When AnsweringModem Disconnects While On-line Am Losing DataAm Getting Garbage Characters on the Monitor Apendix C AT Command Summary Appendix 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 Password Command Summary Command Description #Ixxxxxxxxxx#Syyyyyyyyyy 25bis Commands Delayed and Forbidden Numbers Appendix D V.25bis Operation25bis Operation 25bis Set-Up and Initialization 25bis Mode AT Commands25bis DIP-Switches Appendix D V.25bis OperationChange Serial Baud Rate CSP Command 25bis AT CommandsEnable/Disable V.25bis Mode $V Command 25bis Responses Result CodesListing Forbidden Phone Number RLF Command Dial Phone Number Provided CRN CommandListing Delayed Phone Numbers RLD Command Disregard or Connect to Incoming Calls DIC or CIC CommandItaly DTR Dialing $D CommandITU V.25bis Country Specific Information SwitzerlandBelgium Appendix E MultiModemBA Cables AustriaFrance SingaporeAppendix E MultiModemBA Cables Figure E-1. RS232 Cable IBM PCAppendix F Regulatory Information Appendix F Regulatory Information FCC PartFCC Part 68 Telecom Industry CanadaCanadian Limitations Notice 104EMC, Safety, and R&TTE Directive Compliance International Modem Restrictions105 Index 106Index 107PBX/CBX Disconnect Drop Time for DSR/CTS/CD53 108109
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