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Chapter 3 – Fax Class 2 Commands
Multi-Tech Systems, Inc. SocketModem MT5634SMIxx Reference Guide (S000263C) 55
Commands and Responses Overview
This chapter describes three kinds of commands and responses:
Action commands. Action commands initiate a sequence of events that do not execute instantaneously,
and therefore change command mode to command execution mode. An action command must be the
last command in a command string.
Responses. Responses are result code messages sent to the host by the modem.
Note: Older MultiModem II modems, those with model numbers MT2834xx and lower, respond with
the parameter name as a prefix to the value of the parameter value when a parameter value or range
of values is queried.
For example: AT+FCLASS=2
Response Returned: +FCLASS=2
OK
The command name as prefix can be omitted by setting the +FV option to zero (see Phase C Data
Format Parameters). If the command name prefix is omitted, then the response returned would
simply be 2.
Parameters. Parameter commands set operating conditions. Multiple parameter commands can be
sent
in a command string; however, semicolons must separate them.
All action commands and responses are mandatory. Some parameter commands are mandatory, but
others are optional. Mandatory values are specified for each command and parameter.
Action Commands
Class 2.1 Class 2 Action description
+FDR +FDR Begin or continue Phase C data reception*
+FDT +FDT Begin or continue Phase C data transmission
+FET End page or document command
+FIP Initialize Class 2.0/2.1 parameters command
+FKS +FK Terminate session command—orderly fax abort
* Depends on the capability to receive set by +FCR.