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ATS9 Carrier Detect Response Time
S Register 9 contains the length of time, in tenths of a second, the modem will wait before
asserting the DCD (Data Carrier Detect) signal, after a carrier has been detected.
The longer the time taken before asserting DCD, the less chance of line noise being mistaken by
the modem as a carrier signal.
If you have previously issued an AT&C0 command or placed the DCD option switch in the
DOWN position, the modem will assert the DCD signal regardless of the presence of a carrier
signal from the remote system.
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V.21, Bell 103 and V.23 only.
Examples
ATS9=9 Wait 0.9 seconds after detecting a carrier before connecting to the phone line
(asserting DCD).
Default
6
See Also
&C command Controlling Data Carrier Detect
Range
1-255