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&S0 &S0 = DSR (Data Set Ready) is always true. This line
tells the computer the modem is powered on and ready to
go. This is the normal use of DSR.
&S1 = DSR only goes true when the modem has made
connection with a remote modem. This is a non-standard
use of DSR. Normally the modem uses the DCD (Data
Carrier Detect) wire to tell the computer this fact.
See Also:
pins
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