User Manual

Table Of Contents
28
Modem AT Commands
Appendix A
Mini PCI User’s Guide Xircom Inc
&Sn Data Set Ready (DSR) Options
The AT&Sn command controls the functions of the modem's DSR circuits.
&S0
The DSR signal remains on all the time the modem is powered on (default).
&S1
The DSR signal is on during handshaking and is off when carrier is lost.
&Tn Self-Test Commands
The AT&Tn command allows the user to perform diagnostic tests on the modem.
&T0
Abort. Stops any test in progress.
&T1
Local analog loop. this test verifies modem operation, as well as the connection
between the modem and computer. The modem must be off-line when this test is
run.
&T3
Local digital loopback test.
&T6
Remote digital loopback test. This test can verify the integrity of the local
modem, the communications link, and the remote modem. The modems must be
online with error control disabled when this test is run.
&V View Configuration Profile
The AT&V command displays the contents of the active configuration profile.
&Wn Write Active Profile to Memory
The AT&Wn command, where n is 0, allows you to save a copy of the current active
configuration profile to nonvolatile memory. This profile can be restored at any time by using the
ATZ command or a power-up reset of the modem.
&Yn Select Stored Profile for Hard Reset
This command is included for compatibility with applications that use the &Y0 command. It
does not affect the behavior of the modem.
&Y0
Select stored profile 0 on power up.
&Y1
Not supported, returns ERROR.
&Zn=x Store Telephone Number
The AT&Zn=x command is used to store a telephone number for later dialing using the ATDS=n
(dial stored number) command. In this command, n is 0 or 1 representing 2 storage locations and
x is the stored number. The dial string may contain up to 40 characters.