Modem Reference 6-5
AT Command Reference
A Answer
Typing ATA causes the modem to go off-hook and respond to an
incoming call by generating a carrier signal and starting the handshaking
process. This must be the only command or the final command in the
command line.
If the handshaking process is successful and a connection is established,
the normal CONNECT message is displayed. If the carrier signal is not
detected within the time specified in S-Register S7, a NO CARRIER result
code is displayed.
Bn Select Communications Standard
The ATBn command selects the communication standard (ITU or Bell)
to be used by the modem, as follows:
B0 Use ITU V.22 at 1200bps. B0 selects ITU V.22 at
1200bps and ITU V.21 at 300bps.
B1 Use Bell 212A at 1200bps. B1 selects Bell 212A at
1200bps and Bell 103J at 300bps.
B2 Unselect V.23 reverse channel.
B3 Select V.23 reverse channel.
B15 Selects V.21 when the modem is at 300bps (same as
B0).
B16 Selects Bell103J when the modem is at 300bps (same as
B1).
Note
The ATB1 and ATB16 parameter settings are not available in
some countries. Defaults are country-specific.
Break (Escape) command
See Special Commands at the beginning of this Command Reference
section.
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