110
BOCA PRO16 Reference Guide
COMMAND MEANING
&C Controlling Data Carrier Detect (DCD)
The &C command enables you to control how DCD will operate.
DCD is a RS-232 interface signal from the modem to a remote device,
such as a terminal or a computer, indicating that the modem is receiving
a carrier signal from a remote modem. This signal is switched on
(asserted) when your modem is receiving a valid carrier signal from a
remote modem.
The &C3 option allows a connection that was commenced as a voice call
to switch to fax or data mode without an interruption to the DCD signal
(which might cause the application to think that the line has been lost).
FThe &C command will only have effect when the DCD option switch
is in the UP position and %T0 is selected. (Refer to the Dumb Mode
Section for details.)
Options
AT&C0 DCD signal is always asserted
n AT&C1 DCD signal responds to remote modem
AT&C2 DCD signal always on, pulses low on disconnect
AT&C3 DCD asserted during voice session
Range
0-3
See Also
S Register 9 Carrier Detect Response Time
S Register 10 Lost Carrier/Hang Up Delay
%T DCD Control Dumb Mode Switches
%P Connect Message Timing
Command Descriptions
Command
Descriptions
pro16ref.pm6 6/14/96, 2:38 PM110
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