Multi-Tech Systems MT3334HD8 manual Rn Clear to Send Control, Sn Data Set Ready Control

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MT3334HD8 User Guide

&Rn Clear to Send Control

n = 0, 1, or 2 Default: &R1

The &R command lets you control the state of the Clear to Send (CTS) signal on pin 5 of the RS-232/V.24 interface. Normally, CTS follows RTS when the modem is online. You have three choices. You can force the signal high, allow it to act normally, or set it to stay high until the modem disconnects, go low momentarily, and then go high again. The last option is useful with CBX phone systems and mainframe front ends that require CTS to act in this manner.

&R0 lets CTS act normally, that is, to follow RTS.

&R1 forces CTS high. When the modem goes online, CTS still provides flow control.

&R2 lets CTS drop on disconnect for the time set by register S24, then go high again.

&Sn Data Set Ready Control

n = 0, 1, or 2 Default: &S1

Use the &S command to control the state of the Data Set Ready (DSR) signal on the RS-232/V.24 interface. Normally, DSR follows CD. You can force the signal high; allow it to act normally; or set it to stay high until the modem disconnects, go low momentarily, and then go high again.

&S0 forces DSR high.

&S1 allows DSR to act normally, that is, to follow CD.

&S2 sets up DSR so that it drops for one second on disconnect and then comes up again. (If you want to set the drop time to something other than one second, change register S24.)

&RFn CTS/RTS Interaction Control

n = 0 or 1 Default: &RF1

In normal operation, Clear to Send (CTS) follows Request to Send (RTS) when the modem is online. In other words, if RTS goes off, CTS goes off. In some applications, however, it is necessary for CTS to operate independently of RTS.

&RF0 enables CTS to follow RTS.

&RF1 enables CTS to operate independently of the state of RTS. See the &R command for control of CTS.

&SFn DSR/CD Interaction Control

n = 0 or 1 Default: &SF0

Normally, the Data Set Ready (DSR) signal follows the Carrier Detect (CD) signal. In other words, if CD goes high, DSR goes high. In some applications, however, it may be necessary for DSR to operate independently of CD.

&SF0 enables DSR to follow CD.

&SF1 enables DSR to operate independently of CD. For control of DSR, see the &S command.

30	CommPlete Communications Server

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Contents MT3334HD8 Modem User Guide Multi-Tech Systems, Inc Woodale Drive Mounds View, Minnesota CommPlete Communications Server FCC Fax Warning Canadian Limitations NoticeTable of Contents Testing the MT3334HD8 Warranty, Service, and Technical SupportAppendix D Appendix FIntroduction LED Indicators Power SuppliesIntroduction Manual OrganizationInstallation Technical Specifications Data Rates ModemIntroduction 2400 & 1200 bps MT3334HD8 User Guide Power Installation Safety Warnings MT3334HD8 modem cardPre-Installation Notes Installation ProcedurePage AT Commands Working with AT Commands Command StructureModes of Operation Command Editing AT Commands by Function $BA Dialing Commands Dial Modifier CommandsDs Dial Continuous RedialPulse or Tone Dialing Wait for New Dial ToneRn Reverse Originate/Answer Mode Return to Command Mode After DialingDialing Pause Flash On-HookPhone Number Memory Commands @ Quiet AnswerCall Card Tone Detect DsNd Store a Phone NumberConfiguration Storage and Recall Commands Wn Store ConfigurationNdNe Number Linking List Stored Telephone NumbersModem Response Result Code Commands Fn Load Default ConfigurationReset Modem Echo Command Mode Characters Result Codes Verbose/Terse Online Connection Commands An Answerback#An Auto Speed Detection Bn Answer ToneDCn AT Command Control CDn Cleardown at DisconnectDTn Dtmf Detection #Fn Fallback Modes Gn Guard TonesHn Busy-Out After Disconnect Pn Set Pulse-Dial RatiosRDn Square Wave Ring Detect $Tn Calling Tone#Tn Trellis-Coded Modulation Commands Fn Echo Canceler Frequency Offset CompensationYn Long Space Disconnect RAn Asymmetric Bit RateRS-232 Interface Commands Cn Carrier Detect ControlDn Data Terminal Ready Control Rn Clear to Send Control Sn Data Set Ready ControlRFn CTS/RTS Interaction Control SFn DSR/CD Interaction ControlError Correction and Data Compression Commands En Error Correction Modes#Ln V.42 Error Correction Modes En Data Compression$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 $SBn Serial Port Baud RateImmediate Action Commands Repeat Last CommandInquire Product Code L5, L7 List Current Operating ParametersFlow Control Commands E3 Flow Control Disable En Non-Error Correction Mode Flow ControlE4 Hardware Flow Control E5 XON/XOFF Flow ControlEn Pacing Computer-Initiated Flow Control #Xn Number of Xoff Characters SentForce Answer Mode Escape Sequences+++ATCR In-Band Escape Sequence Breakatcr Out-of-Band Escape SequenceRemote Configuration Commands Atcr Remote Configuration Escape Sequence#Ixxxxxx Change Login Password Go Back OnlineLine Probe Commands #Syyyyyy Change Setup PasswordDPn Read Line Probe Data DFn Format Line Probe DataDiagnostic Commands Tn Respond to Remote Digital Loopback SignalRP Immediate Line Probe Ln Display Line Probe DataUn Loopback Test Modes MT3334HD8 User Guide Registers Registers S0 Number of Rings Until Modem AnswersS1 Ring Count S2 Escape Code CharacterS7 Time for Carrier Abort Timer S4 Line Feed CharacterS5 Backspace Character S6 Wait Time for Dial ToneS10 Carrier Loss Disconnect Delay Time S13 Remote Configuration Escape CharacterS9 Carrier Detect Response Time S11 Tone Dialing Spacing and DurationS30 Inactivity Timer S34 Command Buffer Length After Online Escape SequenceS24 PBX/CBX Disconnect Drop Time for DSR/CTS/CD S25 DTR Dropout TimeS94 Out-of-Service Time S37 DTR Busy-In TimeS43 Force V.34 Connect Speed S48 Maximum V.34 Connect SpeedAT Commands that Affect S-Registers Reading and Assigning S-Register ValuesExamples of Assigning Values Examples of Reading ValuesAT&E2$SP1#L3$R0$MB19200$SB115200$EB1S0=10&W0CR Testing the MT3334HD8 Test procedure Local Analog Loopback Test V.54 LoopTesting the MT3334HD8 Remote Digital Loopback Test V.54 LoopDial 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 ServiceTechnical Support Recording Product InformationMulti-Tech BBS Logging onto the Multi-Tech BBSDownloading a File About CompuServe Reading a MessageLeaving a Message BulletinsAbout the Multi-Tech Fax-Back Service About the InternetUsing FlashPro to Upgrade Firmware Upgrading the MT3334HD8 FirmwareMT3334HD8 User Guide Appendixes Appendix a Ascii Conversion Chart Ctrl Code HEX DECAppendix B Dial Pulses and Tones Dial PulsesTone Dial Frequencies Figure B-2. Standard Dtmf frequencies Appendix C Result Code Summary Multi-Tech Result Codes &Q0Standard AT Result Codes &Q1 Register Unit Range Default Description Appendix D S-Register SummarySets fixed V.34 connect speed = 28800 bps Appendix E AT Command Summary ReturnCDn 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 CharacterIndex 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