FAX Commands and Responses
All FAX messages have the prefix +F. The three types of messages
are action commands, responses, and parameters. Commands go from the DTE
to the DCE. Responses are messages from the DCE to the DTE. Parameter values
may pass in either direction. The DTE sets values; the DCE reports values.
Parameters are assigned values by commands of the form +FPARM=value,
where PARM means any parameter name. Current parameter values can be read
by the DTE using commands of the form +FPARM?. The DCE responds with
a string of values or lines of info-text.
The +F parameters may be changed while the modem is in data mode and off
line. In addition, the Class 2 FAX commands +FMI?, +FMM?, and +FMR? are
valid while the modem is in data mode. These three commands invoke information
text that provide manufacturer identification, model identification, and
revision identification respectively.
Invalid FAX commands and FAX commands that cannot be executed will produce
an ERROR result code.
Click here to return to the Contents page.