Multitech MULTI MODEM II MT5600BA - Manual (Page 44)

4 AT Commands, S-Registers, and Result Codes
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MultiModemII User Guide
Command: &K n Flow Control Selection
Values: n = 0, 3, 4, 5, or 6
Defaults: 3 (data modem mode)
6 (fax modem and voice modes)
Description: &K0 Disables flow control.
&K3 Enables CTS/RTS hardware flow control.
&K4 Enables XON/XOFF software flow control.
&K5 Enables transparent XON/XOFF flow control.
&K6 Enables both RTS/CTS and XON/XOFF flow control.
Note: See also the &E command
Command: &M n Communications Mode
Values: n = 0–3
Default: 0
Description: This command determines the DTR operating mode. The mo-
dem treats the &M command as a subset of the &Q command.
&M0 Selects direct asynchronous operation. Note that the command
sequence &M0\N0 selects normal buffered mode, but the
command sequence \N0&M0 selects direct mode. This is be-
cause the \N0 command is analogous to the &Q6 command.
&M1 Selects synchronous connect mode with asynchronous offline
command mode.
&M2 Selects synchronous connect mode with asynchronous offline
command mode. Same as &M1 except that &M2 enables DTR
dialing of directory slot 0. The modem disconnects if DTR is
low for more than the period stored in S25.
&M3 Selects synchronous connect mode. This mode allows DTR to
act as a talk/data switch. The call is manually initiated while
DTR is inactive. When DTR becomes active, the handshake
proceeds in originate or answer mode according to S14 bit 7.
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 0. 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.