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User’s Manual C-7
AT Commands
Result Codes:
OK n=0,1
ERROROtherwise
&Dn DTR control
This command interprets how the modem responds to the state of the DTR
signal and changes to the DTR signal.
&D0 Ignore. The modem ignores the true status of DTR and treats
it as always on. This should only be used if your
communication software does not provide DTR to the
modem
&D1 If the DTR signal is not detected while in on-line data mode,
the modem enters command mode, issues an OK result
code, and remains connected.
&D2 If the DTR signal is not detected while in on-line data mode,
the modem disconnects (default).
&D3 Reset on the on-to-off DTR transition.
Result Codes:
OK n=0,1,2,3
ERROROtherwise
&F Load factory settings
This command loads the configuration stored and programmed at the
factory. This operation replaces all of the command options and the S-
register settings in the active configuration with factory values.
&F Recall factory setting as active configuration.
&Gn V.22bis guard tone control
This command determines which guard tone, if any, to transmit while
transmitting in the high band (answer mode). This command is only used in
V.22 and V.22bis mode. This option is not used in North America and is for
international use only.
&G0 Guard tone disabled (default).
&G1 Sets guard tone to 550 Hz.
&G2 Sets guard tone to 1800 Hz.
Result Codes:
OK n=0,1,2
ERROROtherwise
&Kn Local flow control selection
&K0 Disable flow control.
&K3 Enable CTS/RTS flow control (default).
&K4 Enable XON/XOFF flow control.