Using Your Modem
3-4
Issue 2 May 1995
G
The data character format for the AT command set must
be one of the following. It can be set using your
communications software:
— 8 data bits + no 1 stop bit.
— 7 data bits + no 2 stop bits.
— 7 data bits + 1 stop bit (parity can be
odd, even, mark, or space).
G
S-Registers also require the AT prefix. To change an
S-Register, use the ATS
n=x command, where n is the
number of the S-Register and
x is the new value to be
stored in that register. S-Registers are described in
Table 4-2 which begins on page 4-20.
G
Commands can be entered one at a time or in strings
(several commands at once – for example,
AT&FS0=0&W). Strings can have up to 60 characters
after the AT prefix.
G
Commands described in this manual that end with the
suffix
n have several options associated with them. For
example, in the
&T
n command, &T6 causes the modem
to perform a remote digital loopback test while
&T8
causes the modem to perform a local loopback test with
patterned data. If no value is entered for the
n variable,
the modem assumes a default value of zero (0) for
n.
G
Commands are acknowledged by the modem with
responses, such as OK or ERROR. These are known as
response codes, which are described in Appendix C.
NOTE:
All commands supported by your modem are described in
Chapter 4,
AT Command Set and S-Registers.
