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Black Box MD1641A, MD1640A manual Send Xon/Xoff Characters #X, Hewlett-Packard ENQ/ACK Pacing &E9

Models: MD1640A MD1641A

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SERIES II INTELLIGENT DATA/FAX MODEMS

When two Series II Modems 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. (Speed Conversion is explained in Section 5.4.11.)

Send Xon/Xoff Characters #X

The #X phone interface command allows the Series II 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 Series II 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 re- sponded to according to Hewlett-Packard protocol.

Normal Mode Modem Flow Control On &E11

When two Series II Modems 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

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Black Box MD1641A Send Xon/Xoff Characters #X, Hewlett-Packard ENQ/ACK Pacing &E9, Normal Mode Modem Flow Control On &E11

Contents

Series II Modem Series II Modem 336+ Series II Modems Series II Intelligent DATA/FAX Modems Contents Manual Dial and Automatic Answer Command ModeModem Testing Callback Security and Remote ConfigurationRegisters Appendix a Troubleshooting DIP-Switch SettingsOther Appendixes Introduction and Description Introduction How To Use This ManualManual Dial and Automatic Answer Installation and ConnectionSoftware Configuration AT Command Mode OperationTesting Your Modem Callback and Remote ConfigurationDIP-Switches Modem Features What is in Your Modem Package?Fax Features Technical Specifications Modulation Mode of OperationIntelligent Features Command BufferCarrier Frequencies Fax CarrierFrequencies Lease Line RestoralOperating Temperature ConnectorsDiagnostics IndicatorsModem LED Indicators PowerIntroduction and Description Controls on PC Board Safety Warnings Installation and ConnectionInstallation Series II Modem 336 MD1641A Connections Series II Intelligent DATA/FAX Modems Is Your Series II Modem Ready for Use? Operating Your Series II Modem Simple Operations Answer/Originate Voice/Data Toggle SwitchSerial Port Limitations IntroductionHow Can You Identify Your Uart Type? Software ConfigurationCOMnFIFO=1 16550 Uart and WindowsConfiguring Software for Your Modem Configuring Your SoftwareAT &F X4 S0= 2 M Changing Default ParametersPC Initialization Strings AT &F X4 S0=0 MAT &F X4 &E5 &E13 &D0 M Other ParametersMacintosh Initialization AT &F X4 MAT &F9 &W0 CR Configuring Software for Your ComputerConfiguring Software for the Remote System Software ConfigurationUser Guide for Series II Modems When to Disable Data CompressionTerminal Emulation File Transfer ProtocolsAT &F S0=0 X4 &E14 M Disabling Error CorrectionAT &F S0=0 X4 &E0 M Dialing/On-Line/Answering Manual Dial and Automatic AnswerSeries II Intelligent DATA/FAX Modems Dial Backup and Leased Line Restoral 336+ Only Manual Dial Backup Call Termination 336+ OnlyAutomatic Leased Line Restoral Operation 336+ Only Series II Intelligent DATA/FAX Modems Manual Call Origination Dial-Up Operation 336+ OnlyAutomatic Answering Handshaking Details Manual AnsweringCall Termination Abort Timer AT Command Editing Command ModeFunctional Modes Command ModeFunctional Modes Summary of AT CommandsMemorize Phone Numbers #L3 #L0#L1 #L2+++ATCR E14E15 $BA1#RCBNxx Result CodesSr? Sr=Q1 Standard AT Result Codes Q0 Series II Result CodesDial Command D Dialing Commands Dialing Action CommandsContinuous Redial a or DTR Dialing $D Dialing a Stored Number NVoice/Data Dialing $VD Dial Modifier CommandsPulse or Tone Dial P or T Automatic Pauses in Dialing Set Pulse Dial Ratios &PLong Space Disconnect Y Reverse the Mode of Operation R Return to Command Mode after Dial Command ExecutionWait for New Dial-Tone W ATDT101099907247465500$0123 4567 8910 Flash On HookCalling Card Detect Tones $ Quiet Answer @ATX4&E1&E5&E13&E15DT17247465500N3 Phone Number Memory CommandsStoring Phone Numbers D...N Number Linking NNListing Numbers Stored in Memory L Loading Factory Defaults &F Configuration and Default Storage Commands32terbo Enable/Disable #V 336 Only Modem Reset ZUnix Uucp Spoofing $SP Synchronous Transmit Clock Select &X Async/Sync Mode Switching &MChap 5 Command Modeter 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 Result Codes Verbose/TerseCommand Mode Phone Line Monitoring Speaker M Phone Line Conditioning CommandsEnable/Disable Trelis Coded Modulation #T Guard Tones &GEnable/Disable Lowspeed Fast Connect $FC 336+ Only Fallback Modes When On-Line #FCleardown at Disconnect &CD Auto Speed Detect #A 7 RS232C Interface Control CommandsCarrier Detect Control &C Clear to Send Control &R Data Terminal Ready Control &DDSR/CD Interaction Control &SF Error Correction CommandsData Set Ready Control &S CTS/RTS Interaction Control &RFAuto-Reliable Mode &E1 Normal Mode &E0Answer Mode Reliable Mode &E2Mode Select #L Originate ModeAuto-Reliable Buffering $A Enable/Disable Auto Reliable Fallback Character $FRetransmit Count $R Error Correction/300bps $E Flow Control CommandsModem Terminal Hardware Flow Control &E4Xon/Xoff Pass-Through &E7 Xon/Xoff Flow Control &E5Send Xon/Xoff Characters #X Normal Mode Modem Flow Control On &E11Hewlett-Packard ENQ/ACK Pacing &E9 Maximum Block Size &BS Terminal/Computer Initiated Pacing &E13Parity Selection #P Asynchronous Word Length Selection $EB 336 Only#X1 = #X0 =Enq/Ack Pacing Commands Speed Conversion CommandsNormal Mode Modem Flow Control Commands Modem Baud Rate $MB Speed Conversion $BASerial Port Baud Rate $SB Help Screens $H Immediate Action CommandsWindows 95 Autodetect Inquiry Inquiry for Product CodeListing Current Operating Parameters L5 L7 Listing On-Line Diagnostics L8Listing S-Register Values L6 On-line diagnostics information On or Off Hook H Break Atcr Force Answer Mode a Line Probe CommandsExiting Command Mode, Going Back On-Line O DF1 Format of Line Probe Graph or Table Commands DF0Immediate Action Line Probe Commands DP1Rings Which Have Occurred Number of Rings Until Modem AnswersReturn Character Escape Code CharacterLine Feed Character Pause Time for Comma Time for Carrier Abort TimerBackspace Character Wait Time for Dial ToneCarrier Detect Response Time S10 Carrier Loss Disconnect Delay TimeS15 Callback Time Delay S13 Remote Configuration Escape CharacterS11 Tone Dialing Tone Spacing and Duration S17 Changing Break Time S16 Callback AttemptsS18 Automatic Leased Line Restoral 336+ Only S24 PBX/CBX Disconnect Drop Time for DSR/CTS/CD S19 Dial-Back Timer 336+ OnlyS25 DTR Dropout Time S29 Local Inactivity Timer S26 Failed Password AttemptsS32 Time Elapse for Escape Sequence S30 Inactivity TimerS37 Time Between DTR Active and Modem On-Hook 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 SummaryATS0=30S3?, and ATS7=55S7? Callback Feature Description Callback Security Remote ConfigurationRemote Configuration Description Callback Security and Remote ConfigurationTo change your Remote Configuration feature status ErrorTo set parity of the password/message prompt To turn your modems Callback Security feature on and offAT#CBN1xxxxxxxxxxCR AT#IxxxxxxxxxxCR xxxxxxxxxx from TableAT#DB2CRÊorÊAT#DB1CR AT#CBN0xxxxxxxxxxCRAT#SyyyyyyyyyyCR yyyyyyyyyy from Table Password Callback Operational Sequence ProceduresRemote Configuration Operation Procedures StepProcedure Remote Configuration ProceduresAssign Passwords for Callback Phone Numbers #CBN Remote Configuration and Callback Security AT CommandsCallback Security Enable/Disable #DB Erase Callback Phone Number #RDNxx Change Login Password #IChange Setup Password #S Erase Callback Password #RCBNxxCallback Attempts S16 Remote Configuration/Callback Security S-RegistersRemote Configuration Character S13 Callback Time Delay S15Local Inactivity Timer S29 Failed Password Attempts S26Modem Testing Local Analog Loopback Test/V.54 Loop Modem TestingDigital Loopback Test local/manual Digital Loopback Test/V.54 Loop 2 Local/Manual119 Digital Loopback Test remote/automatic Digital Loopback Test/V.54 Loop 2 Remote/AutomaticBack-to-Back Test 122 Local Analog Loopback Test Synchronous Mode Synchronous Mode TestingDigital Loopback Test Local/Manual Synchronous Mode Digital Loopback Test Remote/Automatic Synchronous Mode 126 DIP-Switch Settings Series II Modem 336+ MD1640A PC Board DIP-Switch Option Settings129 130 Switch #4 AS/400 Mode Synchronous Mode/Leased Line/Dial-Up131 132 133 134 135 Speaker Volume Control Function Position Effect Recording Option ConfigurationsAT vs. Series II Result Codes DIP Switches #13-16None of the LEDs Light When the Modem Is On Possible Causes and SolutionsModem Does Not Respond to Commands 141 Modem Dials But Cannot Make a Connection 143 Modem Disconnects While On-line Modem Cannot Connect When AnsweringAm Losing Data File Transfer Is Slower Than It Should BeAm Getting Garbage Characters on the Monitor Modem Model No Contacting Black Box Recording Modem InformationShipping and Packaging Making the CallUpgrading the Series II Modem’s Firmware Dial Pulses Appendix B Dial Pulse and Tone-Dial FrequenciesTone Dial Frequencies 697 770 852 941 1209 Digits 1336 1633 $An Appendix C Command SummaryCommand DescriptionDsNd BSn$BAn CDnDPn DFn$Dn $FCn $En$EBn #Fn$Hn Command Values Description$MBn #LnNdNe $Rn #PnRFn $SPn Sr=n$SBn SFn$VDn #Tn#Xn 160+ Dxxxxxx???Nxx Callback Security/Remote Configuration Command SummaryCommand Description #DBn #CBNyyxxxxxxPassword Command Summary 25bis Commands Asynchronous Mode Appendix D DIP-Switch SummaryDIP-Switch Condition Effect Synchronous Mode 166 Appendix E S-Register Summary Appendix E S-Register SummaryS15 S13S24 S36 Effect Appendix F Result Code SummaryDigit Words 172 Appendix F Result Code Summary Appendix G V.25bis Operation Delayed and Forbidden Numbers25bis Operation Appendix G V.25bis Operation25bis Set-Up and Initialization 25bis DIP-Switches25bis Mode AT Commands 25bis Responses Result Codes 25bis AT CommandsChange Serial Baud Rate CSP Command Enable/Disable V.25bis Mode $V CommandDial Phone Number Provided CRN Command Listing Forbidden Phone Number RLF Command Listing Delayed Phone Numbers RLD CommandDisregard or Connect to Incoming Calls DIC or CIC Command DTR Dialing $D Command Italy ITU V.25bis Country Specific InformationAustria Belgium FranceSingapore Appendix H Series II Modem Cables Appendix H Series II modem cables188 Appendix I RS232C Interface Specifications Appendix I RS232C Interface SpecificationsDirection from modem Received Data Pin 3, RD BBRequest To Send Pin 4, RTS CA Direction to modemData Carrier Detect Pin 8, CD CF Signal Ground Pin 7, SG ABClear To Send Pin 5, CTS CB Data Set Ready Pin 6, DSR CCReceive Clock Pin 17, RC DD Transmit Clock Pin 15, TC DBData Terminal Ready Pin 20, TR or DTR CD Terminal Busy Out of Service Pin 25, OOS Ring Indicator Pin 22, RI CEExternal Transmit Clock Pin 24, XTC FCC and IC EMI/RFI Statements Appendix J Regulatory InformationFCC Part 68 Regulations for Telephone-Line Interconnection Appendix J Regulatory Information196 197 Canadian Limitations NoticeCopyright 2000. Black Box Corporation. All rights reserved