Appendix F – Modem AT Commands
Multi-Tech Systems, Inc. MultiAccess ACS User Guide
54
Command: \X
n
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:
This is also controlled via
&E6
and
&E7
.
Command: -C
n
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: %C
n
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
:
%DC
n
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:
The modem will respond to
AT%DC
for 10 seconds after power-up.
Command:
%E
n
Fallback and Fall Forward Control
Values:
n
= 0, 1, or 2
Default: 2
Description:
%E0
Disable fallback and fall forward.
%E1
Enable fallback, disable fall forward.
%E2
Enable fallback and fall forward.
Command
:
%H
n
Direct
Connect
Enable
Values:
n
= 0, 1
Default: 0
Description:
%H0
Sets callback security to normal operation.
%H1 All callback security calls will be direct connect regardless of whether the password
or phone number has the
-
character.