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Chapter 3 – Fax Class 2 Commands
Multi-Tech Systems, Inc. SocketModem MT5634SMIxx Reference Guide (S000263C) 61
Action Commands
Action commands transfer data and punctuate sessions. They also release specific T.30 messages.
An action command with a terminating carriage return character, <CR>, in the syntax specification
must be the last command on a command line. Subsequent commands on the same line as one of
these action commands will be ignored.
All action commands initiate processes. The modem does not accept other commands from the host
until the modem issues a final result code (e.g. OK, CONNECT). The modem will abort the process if
it receives any character before the final result code is issued other than an immediate <LF>
character, flow control characters (<DC1> or <DC3>), or other characters defined for that command.
Originate a Call
Class 2.1 ATD
Syntax: ATD[<dial string>]<CR> or
ATD[<dial string>];<valid commands><CR>
All Multi-Tech MultiModems support the D command to originate a call. This
Originate command is documented in the MultiModem User Guide.
Class 2 ATD
Same as Class 2.1.
Answer a Call
Class 2.1 ATA
Syntax: ATA <CR>
The Answer command is documented in the MultiModem User Guide.
If the Answer command is unsuccessful, the MultiModem reports an appropriate
failure or error type result code, such as NO CARRIER.
If configured to do so by the +FAA parameter, the modem may adaptively answer as
a fax modem or as a data modem. If the modem answers as a data modem, it resets
the +FCLASS parameter to 0, and issues appropriate final result codes (e.g.
CONNECT, NO CARRIER) to the host.
Class 2 ATA
Same as Class 2.1.