Multi-Tech Systems MT3334HD8 manual Flow Control Commands

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MT3334HD8 User Guide

L8 List Online Diagnostics

Default: none

The L8 command displays the modem’s online status. You can print this display and use it as a modem status report or as diagnostic information (such as when calling Technical Support).

If you type +++ATL8 with the modem online, the current online status will be displayed. If you type ATL8 with the modem in command mode, the most recent online status will be displayed. If you type ATL8 immediately after modem power-up, the message NO INFORMATION AVAILABLE will be displayed.

To enter this command while online, type +++ATL8<CR>. Your modem’s online status will be displayed, listing current operating conditions such as link type, line speed, serial speed, line quality, and reason for last disconnect.

&RN Rate Renegotiation

Default: none

The &RN command forces the modem to perform a rate renegotiation while online. To issue it, you must first escape to command mode by issuing the +++AT<CR> command.

&RR Retrain

Default: None

The &RR command forces the modem to perform an immediate retrain while online. To issue it, you must first escape to command mode by issuing the +++AT<CR> command.

Flow Control Commands

Flow control refers to the techniques used by data terminal equipment and the MT3334HD8 to pause and resume the flow of information between them. It prevents a device from accepting more data than it can handle. The MT3334HD8 implements flow control in both directions. When the MT3334HD8 halts the flow of data, it is called flow control, and when the computer halts the flow, it is called pacing.

&BSn Maximum Reliable Block Size

n = 0 or 1 Default: &BS1

When the modem is in reliable mode, use the &BS command to set the maximum size of a data block. MNP Class 3 sends a 64-character block, while Classes 4 and 5 normally send blocks of 256 characters or less. Reducing the block size for MNP 4 and 5 may improve overall throughput when phone lines are noisy; however, it also could slow data transfer if line quality is good.

&BS0 sets the maximum transmit block size to 64 characters.

&BS1 sets the maximum transmit block size to 256 characters.

$EBn Asynchronous Word Length

n = 0 or 1 Default: $EB0

The MT3334HD8 can operate with either a 10-bit format (one start bit, seven data bits, one parity bit, and one stop bit) or an 11-bit format (one start bit, eight data bits, one parity bit, and one stop bit) in both command and online modes.

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CommPlete Communications Server

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Contents MT3334HD8 Modem User Guide Multi-Tech Systems, Inc Woodale Drive Mounds View, Minnesota CommPlete Communications Server FCC Fax Warning Canadian Limitations NoticeTable of Contents Appendix D Testing the MT3334HD8Warranty, Service, and Technical Support Appendix FIntroduction Introduction LED IndicatorsPower Supplies Manual OrganizationInstallation Technical Specifications Data Rates ModemIntroduction 2400 & 1200 bps MT3334HD8 User Guide Power Installation Safety Warnings MT3334HD8 modem cardPre-Installation Notes Installation ProcedurePage AT Commands Working with AT Commands Command StructureModes of Operation Command Editing AT Commands by Function $BA Ds Dial Dialing CommandsDial Modifier Commands Continuous RedialPulse or Tone Dialing Wait for New Dial ToneDialing Pause Rn Reverse Originate/Answer ModeReturn to Command Mode After Dialing Flash On-HookCall Card Tone Detect Phone Number Memory Commands@ Quiet Answer DsNd Store a Phone NumberNdNe Number Linking Configuration Storage and Recall CommandsWn Store Configuration List Stored Telephone NumbersModem Response Result Code Commands Fn Load Default ConfigurationReset Modem Echo Command Mode Characters Result Codes Verbose/Terse #An Auto Speed Detection Online Connection CommandsAn Answerback Bn Answer ToneDCn AT Command Control CDn Cleardown at DisconnectDTn Dtmf Detection Hn Busy-Out After Disconnect #Fn Fallback ModesGn Guard Tones Pn Set Pulse-Dial RatiosRDn Square Wave Ring Detect $Tn Calling Tone#Tn Trellis-Coded Modulation Yn Long Space Disconnect CommandsFn Echo Canceler Frequency Offset Compensation RAn Asymmetric Bit RateRS-232 Interface Commands Cn Carrier Detect ControlDn Data Terminal Ready Control RFn CTS/RTS Interaction Control Rn Clear to Send ControlSn Data Set Ready Control SFn DSR/CD Interaction Control#Ln V.42 Error Correction Modes Error Correction and Data Compression CommandsEn Error Correction Modes En Data Compression$En V.42 Error Correction at 300 bps $Fn Auto-Reliable Fallback Character Enable/Disable$An Auto-Reliable Buffering Speed Conversion Commands $BAn Baud Adjust$Rn Retransmit Count $MBn Modem Baud Rate $SBn Serial Port Baud RateInquire Product Code Immediate Action CommandsRepeat Last Command L5, L7 List Current Operating ParametersFlow Control Commands E4 Hardware Flow Control E3 Flow Control DisableEn Non-Error Correction Mode Flow Control E5 XON/XOFF Flow ControlEn Pacing Computer-Initiated Flow Control #Xn Number of Xoff Characters Sent+++ATCR In-Band Escape Sequence Force Answer ModeEscape Sequences Breakatcr Out-of-Band Escape Sequence#Ixxxxxx Change Login Password Remote Configuration CommandsAtcr Remote Configuration Escape Sequence Go Back OnlineDPn Read Line Probe Data Line Probe Commands#Syyyyyy Change Setup Password DFn Format Line Probe DataRP Immediate Line Probe Diagnostic CommandsTn Respond to Remote Digital Loopback Signal Ln Display Line Probe DataUn Loopback Test Modes MT3334HD8 User Guide Registers S1 Ring Count RegistersS0 Number of Rings Until Modem Answers S2 Escape Code CharacterS5 Backspace Character S7 Time for Carrier Abort TimerS4 Line Feed Character S6 Wait Time for Dial ToneS9 Carrier Detect Response Time S10 Carrier Loss Disconnect Delay TimeS13 Remote Configuration Escape Character S11 Tone Dialing Spacing and DurationS24 PBX/CBX Disconnect Drop Time for DSR/CTS/CD S30 Inactivity TimerS34 Command Buffer Length After Online Escape Sequence S25 DTR Dropout TimeS43 Force V.34 Connect Speed S94 Out-of-Service TimeS37 DTR Busy-In Time S48 Maximum V.34 Connect SpeedExamples of Assigning Values AT Commands that Affect S-RegistersReading and Assigning S-Register Values Examples of Reading ValuesAT&E2$SP1#L3$R0$MB19200$SB115200$EB1S0=10&W0CR Testing the MT3334HD8 Test procedure Local Analog Loopback Test V.54 LoopTesting the MT3334HD8 Remote Digital Loopback Test V.54 LoopDial the remote modem and establish your online connection Local Digital Loopback Test V.54 Loop Local digital loopback testPage Warranty, Service, and Technical Support Limited Warranty ServiceTechnical Support Recording Product InformationMulti-Tech BBS Logging onto the Multi-Tech BBSDownloading a File Leaving a Message About CompuServeReading a Message BulletinsAbout the Multi-Tech Fax-Back Service About the InternetUsing FlashPro to Upgrade Firmware Upgrading the MT3334HD8 FirmwareMT3334HD8 User Guide Appendixes Appendix a Ascii Conversion Chart Ctrl Code HEX DECAppendix B Dial Pulses and Tones Dial PulsesTone Dial Frequencies Figure B-2. Standard Dtmf frequencies Appendix C Result Code Summary Multi-Tech Result Codes &Q0Standard AT Result Codes &Q1 Register Unit Range Default Description Appendix D S-Register SummarySets fixed V.34 connect speed = 28800 bps Appendix E AT Command Summary ReturnCDn AT Command Summary $Fn Command Values Description Command Values Description $MBn RAn Command Values Description SFn Command Values Description #Vn Breakatcr Appendix F Remote Configuration Basic ProcedureSetup Changing the Passwords Changing the Remote Escape CharacterIndex MT3334HD8 User Guide Index Long space break Pacing, 36, 37, 38 enable/disable, 38 ENQ/ACK Commands Loopback tests, 42, 43, 54, 56 tone detection
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