Compaq Global Mini PCI 56k (V.90) Modem by 3Com
9
White Paper
0203-0799-A
AT Command Descriptions
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Escape sequence
The escape sequence allows the modem to exit data mode and enter online command
mode. While in online command mode, you may communicate directly to your modem
using AT commands. Once you are finished, you may return to data mode using the ATO
command.
A pause, the length of which is set by the Escape Guard Time (S12), must be used after
an escape sequence is issued. This pause prevents the modem from interpreting the
escape sequence as data.
The value of the escape sequence character may be changed using Register S2.
$
Display AT Command List
Displays a basic AT command list as well as online Help.
A/
Repeat Last Command
Causes the modem immediately to repeat the previous command such as redialing a
telephone number. The previously executed command remains in the command buffer
until AT is entered or power is turned off. Both actions clear the buffer and make the A/
command invalid since there is no command to repeat. It is not necessary to enter either a
<cr> or AT.
A>
Repeat Last Command
Causes the modem to continuously repeat the previous command such as redialing a
telephone number. It is not necessary to enter either a <cr> or AT.
A
Answer Command
Causes the modem to answer a call without waiting for a ring. This is useful in manually
answering a call or when making a direct connection with another modem.
Bn
Communication Standard Setting
This command is used to answer certain types of calls. A setting of "0" causes the
modem to use the standard ITU-T answer sequence. This is required to answer all V.34
type calls, as well as calls from overseas. A setting of "1" is commonly used to answer
legacy HST-type calls. It should not be used to answer V.34 calls.
B0
ITU-T V.34 answer sequence (default).
B1
U.S answer tone.
Result Codes:
OK
n = 0, 1.
ERROR
Otherwise.
