Toshiba Libretto U100 - Manual (Page 209)

User’s Manual C-7
AT Commands
Zn Recall stored profile
The modem performs a soft reset and restores (recalls) the configuration
profile according to the parameter supplied. If no parameter is specified,
zero is assumed. Either Z0 or Z1 restores the profile.
Result Codes:
OK
n=0,1
ERROR
Otherwise
&Cn Data Carrier Detect (DCD) control
Data Carrier Detect is a signal from the modem to the computer indicating
that a carrier signal is being received from a remote modem. DCD normally
turns off when the modem no longer detects the carrier signal.
Result Codes:
OK
n=0,1
ERROR
Otherwise
&Dn DTR control
This command interprets how the modem responds to the state of the DTR
signal and changes to the DTR signal.
Result Codes:
OK
n=0,1,2,3
ERROR
Otherwise
&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.
&C0 The state of the carrier from the remote modem is ignored.
DCD circuit is always on.
&C1 DCD turns on when the remote modem’s carrier signal is
detected, and off when the carrier signal is not detected
(default).
&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.
&F Recall factory setting as active configuration.