Data Set Ready (DSR) - pin 6
Data Set Ready is an indicator of modem status to the DTE. If &S1 is
not supported, then DSR is on when the modem has power.
The &Sn commands select the behavior of DSR, except if the modem is operating
in one of the synchronous modes or in AutoSync mode.
If &Q1-&Q4 is in effect, DSR acts as if &S1 is in effect regardless
of the actual setting. DSR goes off if CD light goes off.
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