Toshiba V.90 - Manual (Page 44)

AT Commands
AT command formats
25
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:
&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:
Enabled: The modem monitors for busy tones.
Result Codes:
OK n=0,1,2,3,4,5,6,7
ERROR Otherwise
OK n=0,1
ERROR Otherwise
&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).
OK n=0,1
ERROR Otherwise