21
3 - AT Commands, S-Registers and Result Codes
Command
Options Function & Description
&K3 *
Enable bi-directional hardware flow
control (CTS/RTS)
&K4
Enable bi-directional software flow
control (XON/XOFF)
AT& (Ampersand) Commands
Command
Options Function & Description
&M0 *
Async mode
&Pn
Dial Pulse make/break ratio
&P0 *
Make=39%, Break=61% for use in the
United States, international version
Make=33%, Break=67% for use in 10
pps, Japan version
&P1
Make=33%, Break=67% for use in
other countries, international version
Make=33%, Break=67% for use in 20
pps, Japan version
&Rn
CTS/RTS option (for non-CTS flow
control mode and synchronous mode
only)
&R0 *
CTS follows RTS
&R 1
CTS always true
&Sn
Data Set Ready (DSR) option
&S0 *
DSR always on
&S1
DSR on during handshake and on-line,
off in
test mode or idle mode
&Tn
Self-test commands
&T0
Terminate test
&T1
Local analog loopback test
&T3
Local activated remote digital loopback
(RDL) test
&Vn
View active configuration and stored
profile
* Factory default setting
