User's Manual Part 1

74 AT Commands
Revision 1.8 P/N 90023363
AT&C
Description: DATA CARRIER DETECT (DCD) MODE
This command sets the data carrier detect mode.
Syntax: AT&C[<n>]
Parameters: 0, 1
0 sets the data carrier detect so it is always on
1 sets the data carrier detect so it is only on in the presence of a data carrier
Response: This command will return the string OK.
Example: AT&C1<cr>
AT&D
Description: DATA TERMINAL READY (DTR) CONTROL
This command defines how the modem responds, while in data mode, to
the data terminal ready (DTR) circuit changing state from ON to OFF.
Syntax: AT&D[<n>]
Parameters: 0, 1, 2
0 instructs the modem to ignore the data terminal ready state
1 instructs the modem to change to command mode, while remaining
connected to the call
2 instructs the modem to disconnect from the call and then change to
command mode. While the data terminal ready state is set to off, the
modem’s auto-answer function is also off.
Response: This command will return the string OK.
Example: AT&D2<cr>
AT&F
Description: RESTORE FACTORY DEFAULT SETTINGS
This command will return all the modem settings to their factory default
setting.
Syntax: AT&F[0]
Parameters: 0 This parameter is the default, as well as the only parameter, and
does not necessarily have to be typed with the command.
Response: <cr>hello<cr><LF><LF>OK
Example: AT&F0<cr>