Modem Response Result Code Commands | Multi-Tech Systems MT2834MR6

Chapter 3 - AT Commands

3.6Modem Response (Result Code) Commands

The MT2834MR6’s modems can give responses to commands. The most common one is OK, but the modems also can alert you or your software to dial tones, busy signals, connection speeds, and whether the connection is made with error correction or compression enabled. These responses are called result codes, and they can be terse or verbose, Multi-Tech or standard, basic or extended.

En	Echo Command Mode Characters
	n = 0 or 1
	Default: E1
	Normally, when you type commands on the keyboard, the modem echoes the characters
	back to the computer or terminal, which displays them on the monitor. Use the E command
	to turn this feature off and on.
	E0 disables the echo.
	E1 enables the echo.
Qn	Result Codes Enable/Disable
	n = 0, 1, or 2
	Default: Q0
	You can use the Q command to enable or disable result codes for applications such as
	computer-controlled autodialing. You can also use it to disable responses and echo in
	answer mode while leaving originate mode still intelligent; this is called the no response
	answer mode of operation.
	Q0 (or Q) enables result codes.
	Q1 disables result codes for applications such as computer-controlled auto-dialing.
	Q2 enables the no response answer mode, which leaves originate mode intelligent
	while turning off answer mode responses and echo.
&Qn	Result Codes (Multi-Tech or Standard AT)
	n = 0 or 1
	Default: &Q0
	The MT2834MR6 gives you a choice between Multi-Tech result codes and standard AT
	command set responses. Multi-Tech result codes give you more information, but some
	datacomm programs may not be able to use them, in which case, select the standard result
	codes.
	&Q0 selects Multi-Tech responses with RELIABLE, LAPM, and COMPRESSED modifiers.
	With &Q0, the verbose result code for 14,400 bps is CONNECT 14400 LAPM
	COMPRESSED.
	&Q1 selects AT responses with no RELIABLE, LAPM, or COMPRESSED modifiers. With
	&Q1, the verbose result code for 14,400 bps is CONNECT 14400.

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Multi-Tech Systems MT2834MR6 manual Modem Response Result Code 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 300 bps DiagnosticsBell 103/113 Fax Carrier Power Supply Speed Modem LED IndicatorsBusy Switch 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 Modem baud rate Baud adjustFlow control disabled Serial port baud rate Escape sequence selection Force answer modeAlternate out-of-band escape sequence Go back online Dial Dialing CommandsDefault none = phone number Default R0 Dial Modifier CommandsDefault P 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 Default &F8 Configuration Storage and Recall CommandsDefault &W1 = 0, 8, or AT&F8&W0 AT&W1 defaultATZ AT&F9&W0 Modem Response Result Code Commands Default &A0 DefaultResult Codes and Call Progress Selection Default B0 Online Connection Commands#An Auto Speed Detection Default #A0 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 &P0 Models outside U.K Default &G0 models outside U.KDefault *H0 G2 U.K. models only Default Y0 #T0 disables TCM#T1 enables TCM Issued V.34 Commands Default &D2 RS-232 Interface CommandsDefault &C1 Default &R1 S0 forces DSR high Default &S1Go high again S1 allows DSR to act normally, that is, to follow CD Default &E15 Error Correction and Data Compression CommandsDefault &E1 #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 $SB1200 $SBn Serial Port Baud Rate = speed Default $SB57600$SB300 $SB2400 Immediate Action Commands Rate Renegotiation $EBn Asynchronous Word Length = 0 or Default $EB0 Flow Control CommandsBSn Maximum Reliable Block Size = 0 or Default &BS1 Flow Control Disable Non-Error Correction Mode Flow Control Default &E6Default &E8 Default &E10 Pacing Computer-Initiated Flow Control Default &E13#Xn Number of Xoff Characters Sent = 0 or Default #X0 = 12 or Escape Sequences Remote Configuration Commands Atcr Remote Configuration Escape Sequence Line Probe Commands Diagnostic Commands Registers Registers Default 8 H Default 13 MDefault 10 J Return Character Unit 1 second Time for Carrier Abort TimerDefault 45 North America and International 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 2 #L1 Command V.42 Mode Select Command #L1 #L0 Command 3 #L2 Command Autoreliable Mode &E1 Non-Error Correction Mode &E0Reliable Mode &E2 Modes of Operation Flow Control Flow control and pacing 1 XON/XOFF Flow Control &E5 Modem-Initiated Flow ControlHardware Flow Control &E4 1 XON/XOFF Pass-Through &E7 Non-Error Correction Mode Flow Control &E10 and &E11Pacing &E13 Hewlett Packard ENQ/ACK Pacing &E9 Modem-Initiated Flow Control 10.1 V.42 Error Correction ModesNon-Error Correction Mode Flow Control 10.3 XON/XOFF Pass-Through Result Codes MNP Error CorrectionLAP-M Error Correction Speed Conversion Baud Adjust $BA Modem Baud Rate $MB Serial Port Baud Rate $SB Maximum Block Size &BS Related CommandsAutoreliable Buffering $A 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