Philosophy (FAX)
The modem separates data and FAX commands. In particular, data commands
that affect the definition of certain characters (S3, S4,
etc.), determine how many rings to detect before automatic answering (S0),
and set the response behavior (E, Q, and V) which affect
both FAX and data behavior. All other commands that determine the modem
behavior while on line apply only to data calls. The FAX command +FCLASS
determines whether the modem is currently in the data or FAX mode.
The behavior of DTE interface control leads and lamps while the modem is
in a FAX mode is the same as when in the data mode. That is, there is no
special behavior for the FAX modes.
Data and FAX parameters are stored, loaded, and reset as follows:
1. The &F command restores factory default values of all data
and FAX parameters.
2. The Zn command clears any call, loads the appropriate set of data
parameters, and sets +FCLASS = 0. The Zn command does not
change any other FAX parameters.
3. The &Wn command stores data parameters. FAX parameters are
not stored; most FAX programs send FAX parameters to a modem before using
the modem for a call.
4. The Class 2.0 FAX command +FIP sets the Class 2.0 parameters to
their default values and does not affect any data parameters.
The modem is in data mode when +FCLASS equals 0, the default value
for this parameter. When the value of +FCLASS is 1 or 2.0,
the modem is in a FAX mode.
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