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Appendix C
Modem Commands C-1
Modem Commands
This appendix contains the modem commands.
Your telephony modem must be operated under versions of Microsoft Windows later
than 3.1x. The modem will not work under MS-DOS, earlier versions of Microsoft
Windows, or Windows NT.
Table C-1
Modem Commands
Command Description
AT* Attention Code. AT is the command line prefix that tells the modem that
a command or sequence of commands is being entered. It precedes all
commands except the A/ (repeat) and +++ (escape) commands.
Entered alone, AT causes the modem to respond with OK or 0 if it is
ready to receive commands.
Parameters: none
A/ Repeat Last Command. A/ causes the modem to repeat the previous
command, such as redialing a telephone number. The previously
executed command remains in the command buffer until AT is entered
or the power is turned off. Both actions clear the buffer and make the A/
command invalid, since there is no command to repeat.
It is not necessary to enter either an AT before or a <cr> after this
command because they are also held in the command buffer with the
previous command.
Parameters: none
A Answer Command. ATA causes the modem to answer a call without
waiting for a ring. This is useful in manually answering a call or when
making a direct connection with another modem in the originate mode.
Parameters: none
NOTE: Any command that follows A on the same command line is
ignored.The A command is not permitted in some countries. In those
cases, ATA returns an error.
Bn Communications Standard Option. ATBn determines ITU or Bell
standard.
Parameters: n = 0 - 3, 15, 16
n = 0 ITU V.22 for 1200 bps
n = 1 Bell 212A for 1200 bps (default)
n = 2, 3Deselects ITU V.23 reverse channel
n = 15 ITU V.21 for 300 bps
n = 16 Bell 103J for 300 bps (default)
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