Online Connection Commands | Multi-Tech Systems MT3334HD8 manual

MT3334HD8 User Guide

&An Answerback

n = 0 or 1 Default: &A0

The &A command controls the MT3334HD8’s answerback feature. Answerbacks are used in some online realty applications and elsewhere as a security measure. The &A command enables a modem to return a message to an identification request from another computer. The default identification is MESSAGE NOT PROGRAMMED.

&A0 disables the answerback feature.

&A1 enables the modem to return a message to an inquiry.

Online Connection Commands

The following commands control the conditions of the online connection.

#An Auto Speed Detection

n = 0–3 Default: #A0

An MT3334HD8 modem can operate as a 33,600 bps, 28,800 bps, 19,200 bps, 14,400 bps, 9600 bps, 4800 bps, 2400 bps, or 300 bps modem. Use the #A command to select the speed that the modem uses for initial handshaking and subsequent speed selection. The #A command does not control the originating rate of the modem (that is done by the modem baud rate command $MB), but only the answer mode starting speed.

#A0 causes the modem to start at maximum speed, with fallback to 31,200 to 28,800 to 26,400 to 24,000 to 21,600 to 19,200 to 16,800 to 14,400 to 12,000 to 9600 to 4800 to 2400 to 1200 to 300 bps.

#A1 causes the modem to operate at maximum speed only.

#A2 causes the modem to start at maximum speed, with decremental fallback to 4800 bps.

#A3 causes the modem to start at 2400 bps in V.22bis mode, with fallback to 1200 to 300 bps.

Bn Answer Tone

n = 0 or 1 Default: B0

The B command selects the frequency the modem uses for its answer tone. (The answer tone is the tone a modem receiving a call transmits to the modem that called it, thus initiating the handshake between the two modems.) At higher speeds (2400 to 33,600 bps) there is no conflict, because all protocols use the Bell frequency of 2225 Hz. However, the ITU-T specification for V.22 has an answer tone frequency of 2100 Hz. This command is available only in International models.

B0 enables ITU-T frequencies including V.21 (300 bps) and V.23 (1200/75 bps).

B1 enables Bell frequencies including Bell 103 (300 bps).

24	CommPlete Communications Server

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Multi-Tech Systems MT3334HD8 manual Online Connection Commands, An Answerback, #An Auto Speed Detection, Bn Answer Tone

Contents

MT3334HD8 Modem User Guide Multi-Tech Systems, Inc Woodale Drive Mounds View, Minnesota CommPlete Communications Server FCC Fax Warning Canadian Limitations Notice Table of Contents Appendix D Testing the MT3334HD8Warranty, Service, and Technical Support Appendix F Introduction Introduction LED IndicatorsPower Supplies Manual Organization Installation Technical Specifications Data Rates Modem Introduction 2400 & 1200 bps MT3334HD8 User Guide Power Installation Safety Warnings MT3334HD8 modem card Pre-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 Redial Pulse or Tone Dialing Wait for New Dial Tone Dialing Pause Rn Reverse Originate/Answer ModeReturn to Command Mode After Dialing Flash On-Hook Call Card Tone Detect Phone Number Memory Commands@ Quiet Answer DsNd Store a Phone Number NdNe Number Linking Configuration Storage and Recall CommandsWn Store Configuration List Stored Telephone Numbers Modem 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 Tone DCn AT Command Control CDn Cleardown at DisconnectDTn Dtmf Detection Hn Busy-Out After Disconnect #Fn Fallback ModesGn Guard Tones Pn Set Pulse-Dial Ratios RDn Square Wave Ring Detect $Tn Calling Tone#Tn Trellis-Coded Modulation Yn Long Space Disconnect CommandsFn Echo Canceler Frequency Offset Compensation RAn Asymmetric Bit Rate RS-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 $SBn Serial Port Baud Rate Inquire Product Code Immediate Action CommandsRepeat Last Command L5, L7 List Current Operating Parameters Flow Control Commands E4 Hardware Flow Control E3 Flow Control DisableEn Non-Error Correction Mode Flow Control E5 XON/XOFF Flow Control En Pacing Computer-Initiated Flow Control #Xn Number of Xoff Characters Sent +++ATCR In-Band Escape Sequence Force Answer ModeEscape Sequences Breakatcr Out-of-Band Escape Sequence #Ixxxxxx Change Login Password Remote Configuration CommandsAtcr Remote Configuration Escape Sequence Go Back Online DPn Read Line Probe Data Line Probe Commands#Syyyyyy Change Setup Password DFn Format Line Probe Data RP Immediate Line Probe Diagnostic CommandsTn Respond to Remote Digital Loopback Signal Ln Display Line Probe Data Un Loopback Test Modes MT3334HD8 User Guide Registers S1 Ring Count RegistersS0 Number of Rings Until Modem Answers S2 Escape Code Character S5 Backspace Character S7 Time for Carrier Abort TimerS4 Line Feed Character S6 Wait Time for Dial Tone S9 Carrier Detect Response Time S10 Carrier Loss Disconnect Delay TimeS13 Remote Configuration Escape Character S11 Tone Dialing Spacing and Duration S24 PBX/CBX Disconnect Drop Time for DSR/CTS/CD S30 Inactivity TimerS34 Command Buffer Length After Online Escape Sequence S25 DTR Dropout Time S43 Force V.34 Connect Speed S94 Out-of-Service TimeS37 DTR Busy-In Time S48 Maximum V.34 Connect Speed Examples of Assigning Values AT Commands that Affect S-RegistersReading and Assigning S-Register Values Examples of Reading Values AT&E2$SP1#L3$R0$MB19200$SB115200$EB1S0=10&W0CR Testing the MT3334HD8 Test procedure Local Analog Loopback Test V.54 Loop Testing the MT3334HD8 Remote Digital Loopback Test V.54 Loop Dial 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 Service Technical Support Recording Product Information Multi-Tech BBS Logging onto the Multi-Tech BBSDownloading a File Leaving a Message About CompuServeReading a Message Bulletins About the Multi-Tech Fax-Back Service About the Internet Using FlashPro to Upgrade Firmware Upgrading the MT3334HD8 Firmware MT3334HD8 User Guide Appendixes Appendix a Ascii Conversion Chart Ctrl Code HEX DEC Appendix B Dial Pulses and Tones Dial PulsesTone Dial Frequencies Figure B-2. Standard Dtmf frequencies Appendix C Result Code Summary Multi-Tech Result Codes &Q0 Standard AT Result Codes &Q1 Register Unit Range Default Description Appendix D S-Register Summary Sets fixed V.34 connect speed = 28800 bps Appendix E AT Command Summary Return CDn 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 Character Index 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