Multitech MultiModemDSVD User Manual page 41

4 AT Commands, S-Registers, and Result Codes
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 Disable flow control.
&K3 Enable CTS/RTS hardware flow control.
&K4 Enable XON/XOFF software flow control.
&K5 Enable transparent XON/XOFF flow control.
&K6 Enable both RTS/CTS and XON/XOFF flow control.
Command: &M n Communications Mode
Values: n = 0
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.
Command: &P n Pulse Dial Make/Break Ratio
Values: n = 0
Default: 0
Description: &P0 Selects a make/break dial ratio of 39:61 at 10 pulses per sec-
ond.
Command: &Q n Asynchronous Communications Mode
Values: n = 0, 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 com-
mand.)
&Q0 Selects direct asynchronous operation. See &M0.
&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: &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.
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