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Appendix F: AT Command Reference
Note: An asterisk (*) denotes factory default settings.
Command
Description (Default)
A/
Repeat Last Command: (none)
This command re-executes the last ‘AT’ command string stored in the
command buffer. The A/command is the only command not preceded by
‘AT’ and ended by a carriage return.
A
Answer Command: (none)
This command causes the modem to immediately go off-hook and initiate
an Answer Mode handshake without waiting for an incoming ring signal.
This command is useful for manually answering a call or establishing
back-to-back connection with an Originate Mode modem.
Bn
Select CCITT or Bell: (1)
This command selects whether the modem is configured as a CCITT or
BELL modem.
n = 0
Selects CCITT V.22 when the modem is at 1200 bps.
n = 1
Selects Bell 212A when tile modem is at 1200 bps, and Bell
103J when tile modem is at 300bps.*
Cn
Carrier Control Option: (1)
This command is reserved for selecting between Controlled Carrier or
Constant Carrier Modes. This modem supports only Constant Carrier
Mode.
n = 0
Transmit career always off (returns an ERROR message)
n = 1
Normal transmit carrier *
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