Flow Control, Result Codes | Multi-Tech Systems MT3334SMI specification

Chapter 3 - Class 1 Fax Commands

Flow Control

XON/XOFF flow control is used by the ModemModule to match the PC-to-modem data rate to the line signaling rate. XON/XOFF flow control is mandatory and RTS/CTS flow control is optional per the Class 1 standard. There is currently no Class 1 command for setting the flow control method, and no means to read the current flow control method in use. The PC is responsible for matching the modem's default flow control method.

Result Codes

Your Class 1 ModemModule can respond with the basic set of result codes (OK, CONNECT, NO CARRIER, and ERROR) with only minor differences in meaning for fax mode.

If the modem detects a data carrier or tone other than that specified by the +FRM or +FRH command, it sends a CONNECT ERROR (+FCERROR) result code to the PC, then returns to Command mode. This will allow the PC to recover by reconfiguring the modem to define the unexpected signal. The CONNECT ERROR message has the formats +FCERROR (verbose) or +F4 (terse).

Sample Sessions

This section provides Class 1 Fax send and receive handshaking examples.

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Multi-Tech Systems MT3334SMI manual Flow Control, Result Codes, Sample Sessions

Contents

Data/Fax Socketed Modem Model MT3334SMI Evaluation Kit Patents Revision Description Contents Index Introduction and Description Introduction FeaturesProduct Description ModemModule Developer’s Guide Introduction and Description Technical Specifications 1200 bps MT3334SMI Physical Dimensions Physical Dimensions DS1 Test/Demo Board SpecificationsLED1-LED4 MT3334SMI Test/Demo Board Block Diagram Test/Demo Board Block Diagram MT3334SMI Pinout MT3334SMI Pin-out Typical Application Hardware Considerations MT3334SMI Design Considerations Calculating Z for Tip and Ring Traces PC Board Layout ConsiderationsRecommended Transceiver Key MT3334SMI PlacementQty Name Description FCC Part Telecom Labeling Requirements Industry Canada CS-03 ReregistrationMultiple Listing AT Commands, S-Registers, and Result Codes Answer Repeat Last Command AT Commands, S-Registers, and Result Codes Monitor Speaker Mode Monitor Speaker VolumeReturn Online to Data Mode Result Codes Enable/Disable Sr? Read Register Value Modem ResetTone Dialing Result Code Format Asynchronous Communications Mode Command &Fn Load Factory SettingsDisplay Current Settings Store Current Configuration \An Select Maximum MNP Block Size Command &Zy=x Store Dialing Command\Bn Transmit Break \Jn Data Buffer Control \Tn Inactivity Timer \Nn Error Correction Mode Selection\Qn Flow Control Selection \Vn Protocol Result Code Command %En Fallback and Fall Forward Control Command %DCn AT Command ControlCommand +ES=n Enable Synchronous Buffered Mode Enter Setup Password Registers Register Unit Range Default Description S43 Terse Verbose Description Result Codes Class 1 Fax Commands Command Description Class 1 Fax Command Summary Command Class 1 Fax Commands Fax MOD Modulation Parameter ValuesFunction Display Current Class Values Default Data modem Result Code Meaning Function Select Service Class Values Default Data mode ModemModule Developer’s Guide CommandFunction +FRS=? Enter Class 1 Fax Commands +FRM=? Enter Result Codes Flow ControlSample Sessions Action by Command Respone Local Modem Remote PC AT+FRH=3 No Carrier ModemModule Developer’s Guide Class 2 Fax Commands Class 2 Fax Commands EIA SP-2388 August Class 2 Fax Command Implementation+FAA +FAXERR +FCQ +FBOR+FCR Fax Capability Parameters +FDCC+FDCS Current Session Results Data Compression Format Conversion +FDFFC+FDIS Current Session Parameters +FDT +FDR+FECM +FET +FLID +FK+FLNFC +FLPL +FRBC +FPTS+FREL +FSPL +FTSI +FHNG MT3334SMI Remote Configuration Setup Basic ProcedureChanging the Setup Password ModemModule User Guide Changing the Remote Escape Character Remote Configuration MT3334SMI Troubleshooting Local Analog Loopback Test V.54 Loop Test procedure Remote Digital Loopback Test V.54 Loop Troubleshooting Local digital loopback test Local Digital Loopback Test V.54 Loop Upgrade Procedure Identify the Modem Firmware Upgrade OverviewIdentify the Current Firmware Version Multi-Tech Web Site Upgrade Procedure Download the Upgrade FileMulti-Tech BBS Use FlashPro to Upgrade Modem Firmware Extract the Upgrade FilesRestore Your Parameters Clear Your Stored Paramenters Appendixes MT3334SMI International Modem Restrictions FCC FAX UpdateCanadian Limitations Notice Appendixes European Directives User Guide Statement EMC, Safety and Terminal Directive ComplianceNew Zealand Telecom Warning Notice Introduction Appendix B Multi-Tech Flash Programming ProtocolProgramming the Modem Handshake Sequence Other programming concerns Other supported boot code commandsModemModule Developer’s Guide Program Sequence Data Record Intel Hex FormatXxxx End of File Record Extended Address RecordEeee Index Index MT3334SM MT3334SMI MT3334SM