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COURIER HIGH SPEED MODEMS
5-2 Fax Operations
If you have a problem, however, and think the modem may be
in the wrong mode, you can use one of the following AT
commands to manually switch the modem:
AT+FCLASS=0 (Switch to Data mode) <Enter>
AT+FCLASS=1 (Switch to Class 1 Fax mode) <Enter>
AT+FCLASS=2.0 (Switch to Class 2.0 Fax mode) <Enter>
If you are not sure whether the modem is in Data or Fax mode,
type the following command.
AT+FCLASS? <Enter>
The modem returns a value of 0 to indicate Data mode, 1 to
indicate Class 1 Fax mode, or 2.0 to indicate Class 2.0 Fax mode.
NOTE: Whenever the fax modem is reset using the ATZ
command, by toggling the DTR signal, or by turning the power
off and on, the modem will be set to Data mode.
Fax Mode Flow Control Setting
Many facsimile software products use software flow control
when the modem is in Fax mode. Throughout our
documentation, we recommend that you use hardware flow
control for Data mode (factory setting). However, to allow
compatibility with software products that use software flow
control by default, U.S. Robotics fax modems now automatically
change to software flow control when entering Fax mode.