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Modem Commands C-5
Table C-2
AT Commands
Command Description
&Cn Data Carrier Detect Options. AT&Cn controls the DCD options.
Parameters: n = 0, 1
n = 0 DCD is always on; the state of the data carrier from the remote modem is ignored
n = 1 DCD is on when a data carrier is detected; DCD is off when data carrier is not
detected (default)
&Dn Data Terminal Ready Option. AT&Dn controls the DTR (Data Terminal Ready) options.
Parameters: n = 0 - 3
n = 0 The modem ignores DTR (default)
n = 1 The modem assumes the command mode when an on-to-off transition is detected
on DTR
n = 2 The modem hangs up, assumes the command mode, and disables auto answer
upon detecting an on-to-off transition on DTR
n = 3 The modem resets upon detecting an on-to-off transition on DTR
&F Load Factory Defaults. AT&F resets the S registers and commands to the factory default
values.
Parameter: n = 0
n = 0 Recall factory setting as active configuration
&Gn Guard Tone Option. AT&Gn determines guard tone selection.
Parameters: n = 0 - 2
n = 0 No guard tone (default)
n = 1 550 Hz guard tone
n = 2 1800-Hz guard tone
&Kn Local Flow Control Selection. AT&Kn determines guard tone selection.
Parameters: n = 0, 3, 4
n = 0 Disable flow control
n = 3 Enable RTS/CTS flow control (default)
n = 4 Enable XON/XOFF flow control
&Mn Asynchronous Communications Mode.
Parameter: n = 0
n = 0 Asynchronous mode (default)
&Qn Asynchronous Communications Mode.
Parameters: n= 0, 5, 6
n = 0 Asynchronous mode
n = 5 Error control mode (default)
n = 6 Asynchronous mode
&Sn Data Set Ready Option. AT&Sn selects the Data Set Ready (DSR) action.
Parameters: n = 0, 1
n = 0 DSR always on (default)
n = 1 DSR turns on when establishing a connection and off when the connection ends
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