Multi-Tech MT5600BA, User Manual

Page: 48 / 118

MultiModemII User Guide
40
Command: &Q n Sync/Async Mode
Values: n = 0–3, 5, 6
Default: 5
Description: This command is an extension of the &M command, and is used
to control which connection modes are permitted. It is used in
conjunction with S36 and S48. (See also the \N command.)
&Q0 Selects direct asynchronous operation. See &M0.
&Q1 Selects synchronous connect mode with asynchronous offline
command mode. See &M1. (Serial interface operation only.)
&Q2 Selects synchronous connect mode with asynchronous offline
command mode and enables DTR dialing of directory 3. See
&M2
. (Serial interface operation only.)
&Q3 Selects synchronous connect mode with asynchronous offline
command mode and enables DTR to act as a talk/data switch.
See &M3. (Serial interface operation only.)
&Q5 The modem will try to negotiate an error-corrected link. The
modem can be configured using S36 to determine whether a
failure will result in the modem disconnecting or falling back
to a non-error-correction connection. See also \N3.
&Q6 Selects asynchronous operation with speed buffering and no
error correction. Same as \N0.
Command: &R n Clear to Send (CTS) Control
Values: n = 0 or 1
Default: 1
Description: &R0 Let the CTS state follow the RTS state when online..
&R1 Force CTS high (ON).
Command: &S n Data Set Ready (DSR) Control
Values: n = 0 or 1
Default: 0
Description: &S0 Force DSR high (on) at all times.
&S1 Let DSR go high only during a connection.
Command: &T n V.54 Test Commands
Values: n = 0, 1, 3, 4, 5, 6, 7, or 8
Default: None
Description: The modem can perform selected test and diagnostic functions. A
test can be run only when the modem is in asynchronous op-
eration in non-error-correction mode (normal or direct mode).
For tests 3, 6, and 7, a connection between the two modems
must first be established. To terminate a test in progress, the
escape sequence (+++) must be entered first, except for param-
eters 7 and 8. If S18 is non-zero, a test terminates automatically
after the time specified by S18 and displays the OK message.
&T0 Abort. Stop any test in progress.
&T1 Start local analog loopback, V.54 Loop 3. If a connection exists
when this command is issued, the modem hangs up. A CON-
NECT message is displayed at the start of the test.
&T3 Start local digital loopback, V.54 Loop 2. If no connection exists,
ERROR is returned.