3Com Courier, Reference

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2-2 C
HAPTER
2: U
SING THE
AT C
OMMAND
S
ET
AT&K3X2DT5551234
Hyphens and parentheses add to the count of 56 characters but spaces
do not.
Basic AT commands
The command AT informs the modem that a command is coming. AT
must precede all commands except
A/, A> and +++.
Example: Sending
ATD5551234
will make the modem dial 555 1234.
Now, if you send
A/
the modem will dial 555 1234 again.
Using S-Registers
S-Registers are addresses of places in memory where various timin
parameters, redefinitions of selected ASCII characters, and other
configuration settings are stored.
Initially, the S-Register settings for each of the NVRAM templates are the
same. You can overwrite an S-Register’s stored value. See the default
values listed in Appendix A,
S-Registers , for a complete listing of the
initial settings.
AT Attention; a command follows.
&K3 Disable MNP5 data compression; use only V.42 bis compression.
X2 Use the X2 result code subset.
DT Dial the following number using tone dialing.
To configure your modem to Command
Re-execute the last-issued command.
A/
Repeat the last-issued command until canceled by pressing
any key.
A>