Toshiba Portege 3500 User Manual page 201

User's Manual
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:
n = 0, 1, 2, 3
OK
Otherwise
ERROR
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.
AT Commands
H-11