Multi-Tech Systems MT3334HD8 manual RAn

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				E AT Command Summary

	Command	Values	Description
	&Rn	n = 0, 1, or 2	Clear to Send Control
			&R0	Let CTS state follow RTS state when online.
		*** &R1		Force CTS high (on).
			&R2	Let CTS drop on disconnect for time set by S24,
				then go high again.
	&RAn	n = 0 or 1	Asymmetric Bit Rate
		***	&RA0 Enable asymmetric bit rate operation.
			&RA1 Disable asymmetric bit rate operation.
	&RDn	n = 0 or 1	Square Wave Ring Detect
			&RD0 Full wave ring detect only.
		*** &RD1 Full wave and square wave ring detect.
	&RFn	n = 0 or 1	CTS/RTS Interaction Control
			&RF0 Let CTS follow RTS.
		*** &RF1 Let CTS act independently.
	&RN	n/a	Rate Renegotiation
			Forces the modem to renegotiate the data rate.
	&RP	n/a	Immediate Line Probe
			Initiates a retrain that makes the modem read line
			probe information if %DP1 is selected. Valid only
			when online in V.34 mode.
	&RR	n/a	Retrain
			Initiates an immediate retrain without a line probe
			reading.
	$Rn	n = 0 or 1	Retransmit Count
		***	$R0 Disconnect after 12 retransmits.
			$R1 Do not disconnect after 12 retransmits.
	Sr=n	r = 0–11, 13,	Set Register Value
		24, 25, 30,	Set value of S-register r to value of n, where n is
		32, 34, 36,	entered in decimal format.
		37, 43, 48, or
		94; n varies
	Sr?	r = 0–11, 13,	Read Register Value
		24, 25, 30,	Read value of S-register r and display value in 3-digit
		32, 34, 36,	decimal form.
		37, 43, 48, or
		94
	&Sn	n = 0, 1, or 2	Data Set Ready Control
			&S0	Force DSR high (on).
		*** &S1		Let DSR follow CD.
			&S2	DSR drops on disconnect for time set by S24,
				then goes high again.

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Contents MT3334HD8 Modem User Guide Multi-Tech Systems, Inc Woodale Drive Mounds View, Minnesota CommPlete Communications Server Canadian Limitations Notice FCC Fax WarningTable of Contents Appendix F Testing the MT3334HD8Warranty, Service, and Technical Support Appendix DIntroduction Manual Organization LED IndicatorsPower Supplies IntroductionInstallation Data Rates Modem Technical SpecificationsIntroduction 2400 & 1200 bps MT3334HD8 User Guide Power Installation MT3334HD8 modem card Safety WarningsInstallation Procedure Pre-Installation NotesPage AT Commands Working with AT Commands Command StructureModes of Operation Command Editing AT Commands by Function $BA Continuous Redial Dialing CommandsDial Modifier Commands Ds DialWait for New Dial Tone Pulse or Tone DialingFlash On-Hook Rn Reverse Originate/Answer ModeReturn to Command Mode After Dialing Dialing PauseDsNd Store a Phone Number Phone Number Memory Commands@ Quiet Answer Call Card Tone DetectList Stored Telephone Numbers Configuration Storage and Recall CommandsWn Store Configuration NdNe Number LinkingModem Response Result Code Commands Fn Load Default ConfigurationReset Modem Echo Command Mode Characters Result Codes Verbose/Terse Bn Answer Tone Online Connection CommandsAn Answerback #An Auto Speed DetectionDCn AT Command Control CDn Cleardown at DisconnectDTn Dtmf Detection Pn Set Pulse-Dial Ratios #Fn Fallback ModesGn Guard Tones Hn Busy-Out After DisconnectRDn Square Wave Ring Detect $Tn Calling Tone#Tn Trellis-Coded Modulation RAn Asymmetric Bit Rate CommandsFn Echo Canceler Frequency Offset Compensation Yn Long Space DisconnectRS-232 Interface Commands Cn Carrier Detect ControlDn Data Terminal Ready Control SFn DSR/CD Interaction Control Rn Clear to Send ControlSn Data Set Ready Control RFn CTS/RTS Interaction ControlEn Data Compression Error Correction and Data Compression CommandsEn Error Correction Modes #Ln V.42 Error Correction Modes$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 $SBn Serial Port Baud Rate $MBn Modem Baud RateL5, L7 List Current Operating Parameters Immediate Action CommandsRepeat Last Command Inquire Product CodeFlow Control Commands E5 XON/XOFF Flow Control E3 Flow Control DisableEn Non-Error Correction Mode Flow Control E4 Hardware Flow Control#Xn Number of Xoff Characters Sent En Pacing Computer-Initiated Flow ControlBreakatcr Out-of-Band Escape Sequence Force Answer ModeEscape Sequences +++ATCR In-Band Escape SequenceGo Back Online Remote Configuration CommandsAtcr Remote Configuration Escape Sequence #Ixxxxxx Change Login PasswordDFn Format Line Probe Data Line Probe Commands#Syyyyyy Change Setup Password DPn Read Line Probe DataLn Display Line Probe Data Diagnostic CommandsTn Respond to Remote Digital Loopback Signal RP Immediate Line ProbeUn Loopback Test Modes MT3334HD8 User Guide Registers S2 Escape Code Character RegistersS0 Number of Rings Until Modem Answers S1 Ring CountS6 Wait Time for Dial Tone S7 Time for Carrier Abort TimerS4 Line Feed Character S5 Backspace CharacterS11 Tone Dialing Spacing and Duration S10 Carrier Loss Disconnect Delay TimeS13 Remote Configuration Escape Character S9 Carrier Detect Response TimeS25 DTR Dropout Time S30 Inactivity TimerS34 Command Buffer Length After Online Escape Sequence S24 PBX/CBX Disconnect Drop Time for DSR/CTS/CDS48 Maximum V.34 Connect Speed S94 Out-of-Service TimeS37 DTR Busy-In Time S43 Force V.34 Connect SpeedExamples of Reading Values AT Commands that Affect S-RegistersReading and Assigning S-Register Values Examples of Assigning ValuesAT&E2$SP1#L3$R0$MB19200$SB115200$EB1S0=10&W0CR Testing the MT3334HD8 Local Analog Loopback Test V.54 Loop Test procedureRemote Digital Loopback Test V.54 Loop Testing the MT3334HD8Dial the remote modem and establish your online connection Local digital loopback test Local Digital Loopback Test V.54 LoopPage Warranty, Service, and Technical Support Service Limited WarrantyRecording Product Information Technical SupportMulti-Tech BBS Logging onto the Multi-Tech BBSDownloading a File Bulletins About CompuServeReading a Message Leaving a MessageAbout the Internet About the Multi-Tech Fax-Back ServiceUpgrading the MT3334HD8 Firmware Using FlashPro to Upgrade FirmwareMT3334HD8 User Guide Appendixes Ctrl Code HEX DEC Appendix a Ascii Conversion ChartAppendix B Dial Pulses and Tones Dial PulsesTone Dial Frequencies Figure B-2. Standard Dtmf frequencies Multi-Tech Result Codes &Q0 Appendix C Result Code SummaryStandard AT Result Codes &Q1 Appendix D S-Register Summary Register Unit Range Default DescriptionSets fixed V.34 connect speed = 28800 bps Return Appendix E AT Command SummaryCDn 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 Remote Escape Character Changing the PasswordsIndex 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