Default &G0 models outside U.K | Multi-Tech Systems MT2834MR6

Chapter 3 - AT Commands

&Gn	Guard Tones
	n = 0, 1, or 2
	Default: &G0 (models outside U.K.)
	&G2 (U.K. models only)
	The &G command is used to control the presence or absence of guard tones from the
	transmitter when in answer mode at either 1200 or 2400 bps. Guard tones are used in
	Europe and other areas to allow the modem to function in the telephone systems. Guard
	tones are not used in the United States. U.K. models are locked at &G2 (1800 Hz guard
	tone).
	&G0 disables ITU-T guard tones.
	&G1 enables ITU-T 550 Hz guard tone.
	&G2 enables ITU-T 1800 Hz guard tone.
*Hn	Busy-Out After Disconnect
	n = 0 or 1
	Default: *H0
	The *H1 command causes the MT2834MR6 to remain out of service and return a busy
	signal until configuration from the MultiModemManager dedicated management console
	has finished. If no configuration option is set on the dedicated management console, the
	MT2834MR remains out of service for ten seconds after disconnect. Register S94 controls
	the length of the out-of-service, or busy-out, time (see Chapter 4).
	*H0 disables busy-out after disconnect.
	*H1 enables busy-out after disconnect.
&Pn	Set Pulse-Dial Ratios
	n = 0 or 1
	Default: &P0 (Models outside U.K.)
	&P1 (U.K. models only)
	The &P command sets the time ratios between the open (break) and closed (make) states
	of dialing pulses. U.K. models are locked to &P1 (67:33 ratio). See Appendix B for more dial
	pulse information.
	&P0 sets a pulse dial ratio of 60 ms break to 40 ms make.
	&P1 sets a pulse dial ratio of 67 ms break to 33 ms make.
&RDn	Square Wave Ring Detect
	n = 0 or 1
	Default: &RD0 (U.K. and International models)
	&RD1 (North American models)
	The ringback sound that you hear when you dial a number is generated at the local
	telephone office or PBX. Normally, it is a sine wave analog tone. However, some PBXs
	generate square wave rings that can go undetected by normal ring detection circuits,
	resulting in a failure to make a connection. To enable your modem to detect square wave
	rings, use the &RD1 command.
	&RD0 enables sine wave ring detection only.
	&RD1 enables sine wave and square wave ring detection.

38

Image 38

Multi-Tech Systems MT2834MR6 manual Default &G0 models outside U.K, G2 U.K. models only, Default *H0, Set Pulse-Dial Ratios

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 Result Codes and Call Progress Selection DefaultDefault &A0 Default B0 Online Connection Commands#An Auto Speed Detection Default #A0 DCn AT Command Control = 0 or Default %DC0 #Fn Fallback Modes = 0, 1, or Default #F2 CDn Cleardown at Disconnect = 0 or Default &CD0DTn Dtmf Detection = 0 or Default DT0 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 $Rn Retransmit Count = 0 or Default $R0 $En Error Correction at 300 bps = 0 or Default $E0$An Autoreliable Buffering = 0 or Default $A0 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 Reading Values Reading and Assigning S-Register ValuesExamples of Assigning 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 Hardware Flow Control &E4 Modem-Initiated Flow Control1 XON/XOFF Flow Control &E5 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 Retransmit Count $R 13.5 V.42 Error Correction at 300 bps $ESummary 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 2 U.S. and Canadian Customers Multi-Tech Systems, Inc. Warranty & Repairs PoliciesWarranty International Customers outside U.S.A. and Canada International Distributors Repairs Repair Procedures for U.S. and Canadian CustomersRepair Procedures for International Customers Country Telephone Technical SupportInternet Site 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 Register Summary Register Unit Range Default DescriptionAppendix D S34 Appendix E AT Command SummaryCommand Values Description CDn 100 101 102 103 104 105 Appendix F RS-232C Interface SpecificationsSignal Information Negative Positive 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 Setup Introduction to Remote ConfigurationBasic Procedure Changing the Passwords Changing the Remote Escape Character Index Index 118 119 120 121 122 S000326A