EXM-31 Hardware ReferencePage 264 4&R0 CTS follows RTS (synchronous modes only).&R1 CTS always true.Result Codes:OK n=0,1.Error Otherwise.&Sn Data Set Ready OptionThis command controls the functions of DSR. DSR indicates when the modem isconnected 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 idlemode 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=0,1Error Otherwise&Tn Self-Test CommandsThese commands are used to configure and place the modem chip set in various testmodes as defined by CCITT V.54. These tests are typically used to verify the analogand 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:
