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10
Allied Data Technologies
2.4
Explanation of the AT commands
In this section the AT commands are described in alphabetical order. You will find a list of
all the commands in the previous section. For each command the factory default setting is
given. Generally there is no need to change the default setting.
A/
Repeat last command
The modem responds to this command as if the previous command had
been entered again from the terminal. This command must not be
preceded by AT or be followed by <ENTER>.
AT=x
Set S register
This command causes the value x to be assigned to the specified S
register. You can also use the command ATS to set the S register. For
more information see ATS.
AT?
Read S register
This command displays the setting of the selected S register. You can use
the command AT= to set the S register. For more information see ATS.
ATA
Answers
The command ATA puts the modem on line and activates the answer
mode. If no carrier is detected during the period specified in register S7
(default 60 seconds), the modem is switched off line.
Any character entered while the connection is being established
immediately clears the attempted connection.
AT\A
Maximum MNP block size
The MNP error correction mode is activated and the modem operates with
the set maximum block size as shown in the following table.
0 - 64 characters
1 - 128 characters (default)
2 - 192 characters
3 - 256 characters