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4 AT Commands, S-Registers, & Result Codes
29
MultiModemZBA-V-V92 User Guide
Command: -C
n
Data Calling Tone
Values:
n
= 0 or 1
Defaults: 0
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.
Note: For descriptions of the +FAA= and other fax commands, see the Multi-Tech
Fax
Class 2.1 Developer’s Guide
.
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 coun-
tries 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 sV.42bis/MNP 5 data compression.
%C1 Enables 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 it is turned on.
Command: %E
n
Fallback and Fall Forward Control
Values:
n
= 0, 1, or 2
Default: 2
Description: %E0 Disables fallback and fall-forward.
%E1 Enables fallback, disables fall-forward.
%E2 Enables fallback and fall-forward.