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Command:
\Xn
XON/XOFF Pass-Through
Values:
n = 0 or 1
Default:
0
Description:
\X0 Modem responds to and discards XON/XOFF characters.
\X1 Modem responds to and passes XON/XOFF characters.
Note:
Command:
-Cn
Data Calling Tone
Values:
n = 0 or 1
Defaults:
1
Description:
-C0 Disable V.25 data calling tone to deny remote data/fax/voice discrimination.
-C1 Enable 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 or 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 Disable V.42bis/MNP 5 data compression.
%C1 Enable V.42bis/MNP 5 data compression.
Command:
%DCn
AT Command Control
Values:
n = 0 or 1
Default:
0
Description:
%DC0
%DC1
Note:
Command:
%En
Fallback and Fall Forward Control
Values:
n = 0, 1, or 2
2
Default:
Description:
%E0
%E1
%E2
Command:
%Hn
Direct Connect Enable
Values:
n = 0, 1
Default:
0
Description:
%H0
%H1
Multi-Tech Systems, Inc. MultiAccess User Guide
This is also controlled via &E6 and &E7.
The modem responds to AT commands.
The modem ignores AT commands.
The modem will respond to AT%DC for 10 seconds after power-up.
Disable fallback and fall forward.
Enable fallback, disable fall forward.
Enable fallback and fall forward.
Sets callback security to normal operation.
All callback security calls will be direct connect regardless of whether the password
or phone number has the - character.
Appendix F – Modem AT Commands
61
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