8
6179-2201
AT Commands
A – Answer
The modem will go off-hook and attempt to answer an incoming call if correct conditions
are met. Upon successful completion of answer handshake, the modem will go on-line in
answer mode.
The modem will enter the connect state after exchanging carrier with the remote modem.
If no carrier is detected within a period specified in register S7, the modem hangs up.
Any character entered during the connect sequence will abort the connection attempt.
Bn – ITU-T or Bell
When the modem is configured to allow either option, the modem will select Bell or
CCITT modulation for a line speed connection of 300 or 1200 bps according to the
parameter supplied. Any other line speed will use a CCITT modulation standard. The
parameter value, if valid, is written to S27 bit 6.
B0 Selects CCITT operation at 300 or 1200 bps during Call Establishment and a
subsequent connection. (
Default
)
B1 Selects BELL operation at 300 or 1200 bps during Call Establishment and a
subsequent connection.
\Bn – Transmit Break to Remote
In non-error correction mode, the modem will transmit a break signal to the remote
modem with a length in multiples of 100 ms according to parameter specified.
If a number in excess of 9 is entered, 9 is used. The command works in conjunction
with the \K command. In error correction mode, the modem will signal a break through
the active error correction protocol, giving no indication of the length.
\B1-\B9 Break length in 100 ms units. (
Default = 3
.) (Non-error corrected mode only.)
&Cn – RLSD (DCD) Option
The modem controls the RLSD output in accordance with the parameter supplied.
The parameter value, if valid, is written to S21 bit 5.
&C0 RLSD remains ON at all times.
&C1 RLSD follows the state of the carrier. (
Default
)
%C – Enable/Disable Data Compression
Enables or disables data compression negotiation. The modem can only perform data
compression on an error corrected link.
The parameter value, if valid, is written to S41 bits 0 and 1.
%C0 Disables data compression. Resets S46 bit 1.
%C1 Enables MNP 5 data compression negotiation. Resets S46 bit 1.
%C2 Enables V.42 bis data compression. Sets S46 bit 1.
%C3 Enables both V.42 bis and MNP 5 data compression. Sets S46 bit 1. (
Default
)
