3.3 The AT Command Format
3.3.1 Basic Format
AT
(attention) is the prefix to commands to the modem. It must be typed:
AT
or
at
in all upper or all lower case (not mixed cases).
Carriage return (
<CR>
) is the terminator to commands, causing the
modem to action them. It is produced by the
RETURN
,
ENTER
or
|
key on your
DTE.
For example, if from your keyboard you type:
AT<CR>
the modem will respond with:
OK
AT
by itself (followed by
<CR>
) is a command without any required
action. Your modem responding with
OK
indicates that it has recognised
the
AT
. This sequence is useful for checking that the modem is responding
correctly.
3.3.2 Example Commands
A useful command is
*C
, which will display a summary of your modem's
configuration. To execute this command, type:
AT*C<CR>
Another useful command is
*S
, which will display a summary of your
modem's S-register settings (S-registers are discussed in Chapter 9). To
execute this command, type:
AT*S<CR>
3.3.3 Combining Commands
If you wish to enter two or more commands, they can be combined on a
single command line up to a maximum of 80 characters, for example:
AT*C*S<CR>
will display your modem's configuration and then the S-register summary.
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