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Modem Reference 6-17
&Qn Asynchronous Communications Mode
&Q0 Asynchronous mode, buffered (same as \N0)
&Q1 Reserved
&Q2 Reserved
&Q3 Reserved
&Q4 Reserved
&Q5 Error control mode, buffered (default; same as \N3)
&Q6 Asynchronous mode, buffered (same as \N0)
&Q7 Reserved
&Sn Data Set Ready (DSR) Options
The AT&Sn command controls the functions of the modems DSR
circuits.
&S0 The DSR signal remains on all the time the modem is
powered on (default)
&S1 The DSR signal is on during handshaking and is off
when carrier is lost.
&Tn Self-Test Commands
The AT&Tn command allows the user to perform diagnostic tests on the
modem.
&T0 Abort. Stops any test in progress.
&T1 Local analog loop. this test verifies modem operation,
as well as the connection between the modem and
computer. The modem must be off-line when this test
is run.
&T3 Local digital loopback test.
&T6 Remote digital loopback test. This test can verify the
integrity of the local modem, the communications link,
and the remote modem. The modems must be online
with error control disabled when this test is run.