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Using Your Modem
Another period of idle time must also follow the escape
sequence before you enter any AT commands. This idle time
before and after the escape sequence prevents the escape
sequence characters from being misinterpreted as part of the
data stream being sent between the modems. An example of
how to use the escape sequence is provided on page 3-9.
Using AT Commands
The KeepInTouch Card modem uses AT commands and
S-Registers to control its operation. These commands are
issued to your modem from your computer through your
communications software package.
To use AT commands, the modem must be in either Command
mode or online Command mode. If the modem is in Data mode,
you will need to enter the escape sequence (+++) to switch to
Command mode (see page 3-9) before entering a command.
Please review the following guidelines before using any
AT commands.
G
All commands (except A/ (which is used to repeat the
last command) and +++ (escape sequence)) must begin
with the characters AT and end by pressing the Enter
key.
G
The AT (or at) prefix (which means attention) can be
upper- or lowercase, but the modem will not recognize
mixed case prefixes (At or aT).
G
The data character format (how your data is structured)
for the AT command set must be one of the following. It
can be set using your communications software:
— 8 data bits + no parity + 1 stop bit.
— 7 data bits + parity + 1 stop bit (parity can be
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.
odd, even, mark, or space).
Issue 1 November 1994
3-3
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