V.34 Commands | Multi-Tech Systems MT2834MR6 manual

Chapter 3 - AT Commands

3.8V.34 Commands

The following commands apply only in V.34 mode.

%Fn	Echo Canceler Frequency Offset Compensation
	n = 0 or 1
	Default: %F0
	The %F command enables and disables echo canceler frequency offset compensation
	which, when enabled, can decrease modem performance.
	%F0 disables echo canceler frequency offset compensation.
	%F1 enables echo canceler frequency offset compensation.
&RAn	Asymmetric Bit Rate
	n = 0 or 1
	Default: &RA0
	The &RA command enables or disables asymmetric bit rate operation in V.34 mode. The
	asymmetric bit rate feature lets the modem transmit at one rate while receiving at a different
	rate.
	&RA0 enables asymmetric bit rate operation.
	&RA1 disables asymmetric bit rate operation.
#Vn	V.32terbo Handshake
	n = 0 or 1
	Default: #V1
	Some V.32/V.32bis modems have problems handshaking when the MT2834MR6 includes
	V.32terbo mode (19,200 bps) in its handshake. The bits that are used in the rate sequence
	for V.32terbo can cause handshake failure. Use the #V command to include or exclude
	V.32terbo mode from the handshake.
	#V0 includes V.32terbo mode in the handshake.
	#V1 excludes V.32terbo mode from the handshake.

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Multi-Tech Systems MT2834MR6 manual V.34 Commands

Contents

User Guide Revision Date Description Trademarks Contents Registers Warranty & Service Index 116 Introduction Introduction Manual Organization Description FCC Fax Update FCC Regulations for Telephone Line Interconnection Canadian Limitations Notice Technical Specifications Diagnostics Bell 103/113300 bps Fax Carrier Power Supply Modem LED Indicators Busy SwitchSpeed Data Rate bps LED State 10 MT2834MR6 Installation Notes Safety Warnings Dialing and Answering Dial-Up Automatic Answering Dial-Up Handshaking Details Call Termination AT Commands Working with AT Commands Modes of Operation Command Structure Command Editing AT Commands Baud adjust Flow control disabledModem baud rate Serial port baud rate Force answer mode Alternate out-of-band escape sequenceEscape sequence selection Go back online Dialing Commands Default noneDial = phone number Dial Modifier Commands Default PDefault R0 Pulse or Tone Dialing Or 4 through 255 seconds International models ATDT1028806127853500 $123456789 Phone Number Memory Commands NdNe Number Linking = 0 or = 1 or Default none T14082345678 P9,T14089876543 Configuration Storage and Recall Commands Default &W1Default &F8 = 0, 8, or AT&W1 default ATZAT&F8&W0 AT&F9&W0 Modem Response Result Code Commands Default &A0 DefaultResult Codes and Call Progress Selection Online Connection Commands #An Auto Speed Detection Default #A0Default B0 DCn AT Command Control = 0 or Default %DC0 DTn Dtmf Detection = 0 or Default DT0 CDn Cleardown at Disconnect = 0 or Default &CD0#Fn Fallback Modes = 0, 1, or Default #F2 Default &G0 models outside U.K Default *H0Default &P0 Models outside U.K G2 U.K. models only #T0 disables TCM #T1 enables TCMDefault Y0 Issued V.34 Commands RS-232 Interface Commands Default &C1Default &D2 Default &R1 Default &S1 Go high againS0 forces DSR high S1 allows DSR to act normally, that is, to follow CD Error Correction and Data Compression Commands Default &E1Default &E15 #Ln Error Correction Modes Default #L0 $An Autoreliable Buffering = 0 or Default $A0 $En Error Correction at 300 bps = 0 or Default $E0$Rn Retransmit Count = 0 or Default $R0 Speed Conversion Commands $SBn Serial Port Baud Rate = speed Default $SB57600 $SB300$SB1200 $SB2400 Immediate Action Commands Rate Renegotiation Flow Control Commands BSn Maximum Reliable Block Size = 0 or Default &BS1$EBn Asynchronous Word Length = 0 or Default $EB0 Flow Control Disable Default &E6 Default &E8Non-Error Correction Mode Flow Control Default &E10 Default &E13 #Xn Number of Xoff Characters Sent = 0 or Default #X0Pacing Computer-Initiated Flow Control = 12 or Escape Sequences Remote Configuration Commands Atcr Remote Configuration Escape Sequence Line Probe Commands Diagnostic Commands Registers Registers Default 13 M Default 10 JDefault 8 H Return Character Time for Carrier Abort Timer Default 45 North America and InternationalUnit 1 second Range 1-255 U.S.A Maximum S11 value is 255 ms 255 units Registers Registers Examples of Assigning Values Reading and Assigning S-Register ValuesExamples of Reading Values AT Commands Affecting S-Registers Error Correction, Data Compression & Speed Conversion Error Correction, Data Compression, and Speed Conversion How V.42 Detects and Corrects Errors Data Compression MNP Classes V.42 Mode Select Command #L 1 #L0 Command2 #L1 Command 3 #L2 Command Non-Error Correction Mode &E0 Reliable Mode &E2Autoreliable Mode &E1 Modes of Operation Flow Control Flow control and pacing 1 XON/XOFF Flow Control &E5 Modem-Initiated Flow ControlHardware Flow Control &E4 Non-Error Correction Mode Flow Control &E10 and &E11 Pacing &E131 XON/XOFF Pass-Through &E7 Hewlett Packard ENQ/ACK Pacing &E9 10.1 V.42 Error Correction Modes Non-Error Correction Mode Flow ControlModem-Initiated Flow Control 10.3 XON/XOFF Pass-Through MNP Error Correction LAP-M Error CorrectionResult Codes Speed Conversion Baud Adjust $BA Modem Baud Rate $MB Serial Port Baud Rate $SB Related Commands Autoreliable Buffering $AMaximum Block Size &BS Autoreliable Fallback Character $F Summary 13.5 V.42 Error Correction at 300 bps $ERetransmit Count $R Testing & Troubleshooting Testing and Troubleshooting Test Procedure Local Analog Loopback Test V.54 Loop Remote Digital Loopback Test V.54 Loop Remote digital loopback test Local Digital Loopback Test V.54 Loop Local digital loopback test Warranty & Service Warranty Multi-Tech Systems, Inc. Warranty & Repairs Policies2 U.S. and Canadian Customers International Customers outside U.S.A. and Canada International Distributors Repair Procedures for International Customers Repair Procedures for U.S. and Canadian CustomersRepairs Internet Site Technical SupportCountry Telephone Appendices Ascii Conversion Chart Appendix a Appendix B Dial Pulses Tone Dial Frequencies Figure B-2. Standard Dtmf frequencies Appendix C Result Code Summary Standard AT Result Codes &Q1 Appendix D Register Unit Range Default DescriptionRegister Summary S34 Command Values Description AT Command SummaryAppendix E CDn 100 101 102 103 104 105 Signal Information Negative Positive RS-232C Interface SpecificationsAppendix F Functional Description of the RS-232C Signals Transmitted Data TD Pin 2 To modem Test Voltage +V Pin From modem External Transmit Clock XTC Pin To modem Cable and Connector Diagrams Appendix G Appendix H Introduction to MultiTech Escape Methods How to Select an Escape Method Escape Method 1 +++ATCR Registers and Escape Sequence Aborting an Escape Sequence Basic Procedure Introduction to Remote ConfigurationSetup Changing the Passwords Changing the Remote Escape Character Index Index 118 119 120 121 122 S000326A