3Com U.S. Robotics 56K Voice, Command Reference Manual

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Data and Fax Modes 3-5
If you are not sure whether your modem is in Data or Fax mode, use the
AT+FCLASS?
command
.
Whenever the modem is reset using the ATZ command or by turning the
power off and then on, it will reset to Data Mode.
If the modem
returns a value of
This indicates
0 Data Mode
1 Class 1 Fax Mode
2.0 Class 2.0 Fax Mode.