Advantech PCM-3601 - Manual (Page 27)

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5.4 ECDC Operation Mode Selection [\N]
\N0 Set modem to normal mode
\N1 Set modem to direct mode
\N2 Set modem to MNP reliable mode
\N3 Set to MNP/V.42 auto-eliable mode
\N4 V.42 reliable with phase detection
5.5 MNP Response Code Option [\V]
\V0 Connect messages are controlled by the command
settings X, W, and S95.
\V1 Connect message displayed in the single line
format described below subject to the command
settings V (Verbose) and Q(Quiet). In Non-
Verbose mode(V0), single line connect messages
are disabled and a single numeric result code is
generated for CONNECT DTE.
5.6 Data Compression [%C]
%C0 Disable data compression
%C1 Enable MNP5 data compression negotiation
%C2 Enable V.42bis data compression
%C3 Enable both V.42bis and MNP5 data compression
(default)
5.7 Automatic Retrain [%E]
%E0 Disable auto-retrain
%E1 Enable auto-retrain
%E2 Enable fallback/fall forward