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AT Command Set and S-Registers
Table 4-1. AT Command Reference (1 of 18)
AT
Command Description
+++
Escape sequence
The escape sequence allows the modem to exit Data mode
and enter online Command mode. For more information on this
command, see Chapter 3.
A/
Repeat Last Command
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
Allows the modem to go off-hook and attempt to answer an
incoming call.
Bn
CCITT/Bell Mode
This command selects whether the modem is configured as a
CCITT or BELL modem.
B0
B1
C n
Carrier Control Option
This command is reserved for selecting between controlled
carrier or constant carrier modes. This modem supports only
constant carrier mode.
C0
C1
4-2
Issue 1 November 1994
Selects CCITT V.22 when the modem is at 1200 bps.
Selects Bell 212A when the modem is at 1200 bps,
and Bell 103J when the modem is at 300 bps.
Transmit carrier always off (returns an ERROR
message).
Normal Transmit carrier.
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