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Black Box MD1641A, MD1640A manual Hardware Flow Control &E4, Modem Terminal

Models: MD1640A MD1641A

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SERIES II INTELLIGENT DATA/FAX MODEMS

Modem-Initiated Flow Control

RS/232/V.24 Computer or

	Modem		Terminal
		data flow


	Computer-Initiated Flow Control

RS/232/V.24

Modem

data flow

Computer,

Terminal, or

Printer

Figure 5-2. Flow Control and Pacing

Hardware Flow Control &E4

With Hardware Flow Control, the modem uses its RS232C interface to control the flow of data from the computer or terminal to which it is attached. The CTS (Clear to Send) signal on Pin 5 of the RS232C interface is brought low to stop the flow of data, and is brought high to restart it. When you select Hardware Flow Control as your Modem Initiated Flow Control method, you will also be selecting it for Pacing.

The difference between the two, however, is that Modem-Initiated Flow Control uses the Pin 5 CTS output signal, while Pacing uses the Pin 4 RTS input signal.

Modem commands are used to select the method of flow control used by the Series II Modem when its error correction capabilities are used. These commands are covered in Section 5.4.9. If neither method is selected, the modem defaults to no flow control (&E3).

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Black Box MD1641A, MD1640A manual Hardware Flow Control &E4, Modem Terminal

Contents

Series II Modem Series II Modem 336+ Series II Modems Series II Intelligent DATA/FAX Modems Contents Manual Dial and Automatic Answer Command ModeRegisters Callback Security and Remote ConfigurationModem Testing Other Appendixes DIP-Switch SettingsAppendix a Troubleshooting Introduction and Description Introduction How To Use This ManualSoftware Configuration Installation and ConnectionAT Command Mode Operation Manual Dial and Automatic AnswerDIP-Switches Callback and Remote ConfigurationTesting Your Modem Modem Features What is in Your Modem Package?Fax Features Technical Specifications Intelligent Features Mode of OperationCommand Buffer ModulationFrequencies Fax CarrierLease Line Restoral Carrier FrequenciesDiagnostics ConnectorsIndicators Operating TemperatureModem 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 SoftwarePC Initialization Strings Changing Default ParametersAT &F X4 S0=0 M AT &F X4 S0= 2 MMacintosh Initialization Other ParametersAT &F X4 M AT &F X4 &E5 &E13 &D0 MConfiguring Software for the Remote System Configuring Software for Your ComputerSoftware Configuration AT &F9 &W0 CRTerminal Emulation When to Disable Data CompressionFile Transfer Protocols User Guide for Series II ModemsAT &F S0=0 X4 &E0 M Disabling Error CorrectionAT &F S0=0 X4 &E14 M Dialing/On-Line/Answering Manual Dial and Automatic AnswerSeries II Intelligent DATA/FAX Modems Automatic Leased Line Restoral Operation 336+ Only Manual Dial Backup Call Termination 336+ OnlyDial Backup and Leased Line Restoral 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 #L1 #L0#L2 #L3E15 E14$BA1 +++ATCRSr? Result CodesSr= #RCBNxxQ1 Standard AT Result Codes Q0 Series II Result CodesContinuous Redial a or Dialing Commands Dialing Action CommandsDial Command D DTR Dialing $D Dialing a Stored Number NPulse or Tone Dial P or T Dial Modifier CommandsVoice/Data Dialing $VD Long Space Disconnect Y Set Pulse Dial Ratios &PAutomatic Pauses in Dialing Wait for New Dial-Tone W Return to Command Mode after Dial Command ExecutionReverse the Mode of Operation R Calling Card Detect Tones $ Flash On HookQuiet Answer @ ATDT101099907247465500$0123 4567 8910Storing Phone Numbers D...N Phone Number Memory CommandsNumber Linking NN ATX4&E1&E5&E13&E15DT17247465500N3Listing Numbers Stored in Memory L Loading Factory Defaults &F Configuration and Default Storage CommandsUnix Uucp Spoofing $SP Modem Reset Z32terbo Enable/Disable #V 336 Only Synchronous Transmit Clock Select &X Async/Sync Mode Switching &MEcho Command Mode Characters E Command Response Result Code CommandsResult Codes Enable/Disable and No Response Answer Q Chap 5 Command ModeterResult Codes Basic and Extended and Call Progress Selection Result Codes Verbose/TerseCommand Mode Enable/Disable Trelis Coded Modulation #T Phone Line Conditioning CommandsGuard Tones &G Phone Line Monitoring Speaker MCleardown at Disconnect &CD Fallback Modes When On-Line #FEnable/Disable Lowspeed Fast Connect $FC 336+ Only Carrier Detect Control &C 7 RS232C Interface Control CommandsAuto Speed Detect #A Clear to Send Control &R Data Terminal Ready Control &DData Set Ready Control &S Error Correction CommandsCTS/RTS Interaction Control &RF DSR/CD Interaction Control &SFAuto-Reliable Mode &E1 Normal Mode &E0Mode Select #L Reliable Mode &E2Originate Mode Answer 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 &E5Hewlett-Packard ENQ/ACK Pacing &E9 Normal Mode Modem Flow Control On &E11Send Xon/Xoff Characters #X Maximum Block Size &BS Terminal/Computer Initiated Pacing &E13Parity Selection #P Asynchronous Word Length Selection $EB 336 Only#X1 = #X0 =Normal Mode Modem Flow Control Commands Speed Conversion CommandsEnq/Ack Pacing 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 S-Register Values L6 Listing On-Line Diagnostics L8Listing Current Operating Parameters L5 L7 On-line diagnostics information On or Off Hook H Break Atcr Exiting Command Mode, Going Back On-Line O Line Probe CommandsForce Answer Mode a Immediate Action Line Probe Commands Format of Line Probe Graph or Table Commands DF0DP1 DF1Rings Which Have Occurred Number of Rings Until Modem AnswersLine Feed Character Escape Code CharacterReturn Character Backspace Character Time for Carrier Abort TimerWait Time for Dial Tone Pause Time for CommaCarrier Detect Response Time S10 Carrier Loss Disconnect Delay TimeS11 Tone Dialing Tone Spacing and Duration S13 Remote Configuration Escape CharacterS15 Callback Time Delay S18 Automatic Leased Line Restoral 336+ Only S16 Callback AttemptsS17 Changing Break Time S25 DTR Dropout Time S19 Dial-Back Timer 336+ OnlyS24 PBX/CBX Disconnect Drop Time for DSR/CTS/CD S29 Local Inactivity Timer S26 Failed Password AttemptsS32 Time Elapse for Escape Sequence S30 Inactivity TimerS48 Program V.34bis Connect Speeds S36 Time Between DTR Inactive and Modem Off-HookS37 Time Between DTR Active and Modem On-Hook Examples of Assigning Values Reading and Assigning S-Register ValuesATS0=30S3?, and ATS7=55S7? AT Command and S-Register SummaryExamples of Reading Values 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#DB2CRÊorÊAT#DB1CR AT#IxxxxxxxxxxCR xxxxxxxxxx from TableAT#CBN0xxxxxxxxxxCR AT#CBN1xxxxxxxxxxCRAT#SyyyyyyyyyyCR yyyyyyyyyy from Table Password Callback Operational Sequence ProceduresRemote Configuration Operation Procedures StepProcedure Remote Configuration ProceduresCallback Security Enable/Disable #DB Remote Configuration and Callback Security AT CommandsAssign Passwords for Callback Phone Numbers #CBN Change Setup Password #S Change Login Password #IErase Callback Password #RCBNxx Erase Callback Phone Number #RDNxxRemote Configuration Character S13 Remote Configuration/Callback Security S-RegistersCallback Time Delay S15 Callback Attempts S16Local 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 Tone Dial Frequencies 697 770 852 941 1209 Digits 1336 1633 Appendix B Dial Pulse and Tone-Dial FrequenciesDial Pulses Command Appendix C Command SummaryDescription $An$BAn BSnCDn DsNd$Dn DFnDPn $EBn $En#Fn $FCn$Hn Command Values DescriptionNdNe #Ln$MBn RFn #Pn$Rn $SBn Sr=nSFn $SPn$VDn #Tn#Xn 160Command Description #DBn Callback Security/Remote Configuration Command Summary#CBNyyxxxxxx + Dxxxxxx???NxxPassword Command Summary 25bis Commands DIP-Switch Condition Effect Appendix D DIP-Switch SummaryAsynchronous Mode Synchronous Mode 166 Appendix E S-Register Summary Appendix E S-Register SummaryS15 S13S24 S36 Digit Words Appendix F Result Code SummaryEffect 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 Disregard or Connect to Incoming Calls DIC or CIC Command Listing Delayed Phone Numbers RLD CommandListing Forbidden Phone Number RLF 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 SpecificationsRequest To Send Pin 4, RTS CA Received Data Pin 3, RD BBDirection to modem Direction from modemClear To Send Pin 5, CTS CB Signal Ground Pin 7, SG ABData Set Ready Pin 6, DSR CC Data Carrier Detect Pin 8, CD CFData Terminal Ready Pin 20, TR or DTR CD Transmit Clock Pin 15, TC DBReceive Clock Pin 17, RC DD External Transmit Clock Pin 24, XTC Ring Indicator Pin 22, RI CETerminal Busy Out of Service Pin 25, OOS 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