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APPENDIX A. AT COMMANDS
ACTIVE Professional External Modem User’s Manual
20
AT\K2,3
Modem does not clear buffers but sends a break to the
local DTE
AT\K4,5
Modem sends a break in sequence with any received
data
AT\Ln
MNP block transfer control
Default : 0
AT\L0
Uses stream mode for MNP link connections
AT\L1
Uses block mode for MNP link connections
AT\Nn
Operation mode control
Default : 3
\N0
Selects normal speed buffered mode (no error correction)
\N1
Selects direct mode (equivalent to &M0, &Q0)
\N2
Selects reliable mode. Failure to make reliable connection
results in the modem hanging-up
\N3
Selects auto-reliable mode
\N4
Selects LAPM error correction mode. Failure to make an
LAPM error correction connection results in the modem
hanging-up
\N5
Selects MNP error correction mode. Failure to make an
MNP error correction connection results in the modem
hanging-up
AT\Vn
Connect Message
Default : 0
AT\V0
Disable single line connect message.
AT\V1
Enable single line connect message
AT%Cn *
Compression control
Default : 3
%C0
Disables data compression
%C1
Enables MNP5 data compression
%C2
Enables V.42bis data compression
%C3
Enables both MNP5 and V.42bis data compression
AT%En
Enable/disable auto-retrain
Default : 2
Controls whether the modem will automatically monitor the line quality
and request a retrain (%E1) or fall back when line quality is insufficient
or fall forward when line quality is sufficient (%E2)
%E0
Disables line quality monitor and auto-retrain
%E1
Enables line quality monitor and auto-retrain
%E2
Enables line quality monitor and fallback/fall forward
%E3
Enables line quality monitor and auto-retrain, but hang-up
immediately when EQM reaches hang-up threshold (fast
hang-up)
AT%L
Report received signal level
Returns a value identifying the received signal level. The value is
implemented as follows:
001 =
Received level of -1dBm