Toshiba V.90 - Manual (Page 33)

AT Commands
AT command formats
14
+++ Escape sequence
The escape sequence allows the modem to exit data mode and
enter online command mode. While in online command mode,
you can communicate directly with your modem using AT
commands. When you finish, you can return to data mode using
the ATO command.
There must be a pause, the length of which is set by Escape Guard
Time (S12), after you enter an escape sequence before any
additional characters can be sent to the modem. This pause
prevents the modem from interpreting the escape sequence as
data.
The value of the escape sequence character may be changed using
register S2.
A/ Repeat last command
This command repeats the last command string entered. Do not
precede this command with an AT prefix nor conclude it by
pressing
Enter .
A Answer command
This command instructs the modem to go off-hook and answer an
incoming call.
Bn Communication standard setting
This command determines the communication standard—either
CCITT or Bell.
NOTE: This command is only useful for matching the
modem to slower modems. It is rarely used today.