User Manual

Table Of Contents
26
Modem AT Commands
Appendix A
Mini PCI User’s Guide Xircom Inc
&Cn Data Carrier Detect (DCD)
The AT&Cn command, where n represents 0 or 1, selects the method by which the modem
handles the carrier detect signal.
&C0
The carrier detect signal is forced on regardless of the condition of the distant
modem's carrier.
&C1
The state of the carrier from the remote modem is monitored. The local modem's
DCD signal is on when the remote modem's carrier signal is detected, and off
when it is not (default).
&Dn Data Terminal Ready (DTR) Options
The AT&Dn command, where n represents 0-3, controls how the Data Terminal Ready (DTR)
signal is used by the modem.
&D0
Ignore the DTR signal from the computer and treat it as always on.
&D1
Monitor DTR and, when an ON-to-OFF transition of the DTR signal occurs,
switch to command mode, issue an OK result code, and remain connected.
&D2
Monitor DTR and, when an ON-to-OFF transition of the DTR signal occurs,
hang up the line and switch to command mode.
&D3
Monitor DTR and, when an ON-to-OFF transition of the DTR signal occurs,
hang up, reset the modem and switch to the initialization state.
&Fn Load Factory Settings
The AT&F command loads factory default parameters from ROM into the active configuration
profile, replacing the parameters stored there. This command must be issued by itself. If it is
used with another AT command, its function will be ignored.
&F0 Recall factory settings as active configuration.
&F5
Recall factory settings appropriate for ETC mode as active configuration. This
command enables ETC operation. It is automatically set upon detection of a
cellular phone. The following options are set with &F5:
Local Factory Settings
Function
MTC Implementation
LAPM-only error correction
\N4
Transmit level fixed per cellular phone
S92
Wait for carrier = 90 sec
S7=90
CD loss delay = 10 sec
S10=100
Auto FF/FB enabled
N/A
Start up at 9600bps
S40=2