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6610-2203
6. 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.
Please also refer to AT&An
Syntax:
ATA
Examples:
Result Codes:
Please refer to Result codes (7)
&A – Ignore DTR character
The modem normally aborts the connection negotiation if a character is received from DTE
during the connection phase.This command gives the user the option to let the modem
ignore incoming characters.The parameter value, if valid, is written to S14 bit 4.
Syntax:
AT&A<value>
<value>
= 0 Enable abort (default)
= 1Disable abort
Examples:
Result Codes:
OK
<value> = (0-1)
ERROR
Otherwise
B – 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 bit/s according to the parameter sup-
plied. 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 bit/s during Call Establishment and a
subsequent connection. (
Default
)
B1 Selects BELL operation at 300 or 1200 bit/s during Call Establishment and a
subsequent connection.
\B – 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.)
