EXM-31 Hardware Reference
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&R0
CTS follows RTS (synchronous modes only).
&R1
CTS always true.
Result Codes:
OK
n=0,1.
Error
Otherwise.
&Sn Data Set Ready Option
This command controls the functions of DSR. DSR indicates when the modem is
connected to a communications channel and is ready.
(If &Q0 is selected)
&S0
DSR circuit always on.
&S1
DSR circuit on during handshaking, and in test modes/off in idle
mode and when carrier is lost.
(If &Q1, &Q2, &Q3 or &Q4 is selected)
DSR circuit on during handshaking, off in test or idle mode.
Result Codes:
OK
n=0,1
Error
Otherwise
&Tn Self-Test
Commands
These commands are used to configure and place the modem chip set in various test
modes as defined by CCITT V.54. These tests are typically used to verify the analog
and digital portions of a modem’s operation.
&T0
Terminate
test.
&T1
Local analog loopback.
O = Low-frequency band.
A = High-frequency band.
&T3
Local activated Remote Digital Loopback (RDL).
&T4
Grant request from remote for RDL test.
&T5
Deny request from remote for RDL test.
&T6
Remote digital loopback test.
&T7
Remote digital loopback with self-test.
&T8
Local analog loopback with self-test.
Result Codes: