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CHAPTER 5: AT Commands, S-Registers, and Result Codes
Description:
-C0
Disables V.25 data calling tone to deny remote
data/fax/voice discrimination.
-C1
Enables V.25 data calling tone to allow remote
data/fax/voice discrimination.
Command:
%A
Adaptive Answer Result Code Enable
Values:
n = 0 or 1
Default:
0
Description:
The %A command controls whether the DATA and
FAX result codes will be sent by the modem. The
modem must be in fax mode for this command to
work. Also, the modem must be set to +FAA=1,
which enables the modem to distinguish between a
fax and a data call. When these commands are
enabled, the modem sends DATA to the computer
when it detects data tones, and FAX when it detects
fax tones. These strings are used by some servers to
select the appropriate communication program.
%A0
Disables adaptive answer result codes.
%A1
Enables adaptive answer result codes.
Command:
%B
View Numbers in Blacklist
Values:
n/a
Description:
If blacklisting is in effect, AT%B displays the
numbers for which the last call attempted in the
previous two hours failed. In countries that do not
require blacklisting, the ERROR result code appears.
Command:
%Cn
Data Compression Control
Values:
n = 0 or 1
Default:
1
Description:
%C0
Disables V.42 bis/MNP 5 data compression.
%C1
Enables V.42 bis/MNP 5 data compression.
Command:
%DCn
AT Command Control
Values:
n = 0 or 1
Default:
0
Description:
%DC0
The modem responds to AT commands.
%DC1
The modem ignores AT commands.
Note that the modem will respond to AT%DC for
10 seconds after it is turned on.
