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AT Command Set and S-Registers
Table 4-1. AT Command Reference (9 of 18)
AT
Command Description
\N n
SET ERROR CONTROL MODE
This command determines the type of connection attempted
by the modem. If this command is entered while in online
Command mode, the changes will not take effect until the
next time a connection is established.
\N0
\N1
\N2
\N4
\N6
\N7
\N8
4-10
Issue 2
Normal Mode (Buffered Mode) — No data
compression or error control, but does use flow
control. The data is buffered. This mode can be used
when your communications package provides its
own error control, or if errors in the data are
acceptable. Normal mode can be used even if the
remote modem is set for Direct mode.
Direct Mode — No data compression, error control,
or flow control. The data is not buffered. Errors in the
data transmission may occur. The DTE
(PC-to-modem) speed must match the
modem-to-modem speed.
MNP or Disconnect (Reliable Mode) — The modem
attempts to connect using MNP error control,
hanging up if it fails.
V.42 or Disconnect (Reliable Mode) — The modem
attempts to connect using V.42 LAPM error control,
hanging up if it fails.
V.42 or MNP or Disconnect (Reliable Mode) — The
modem attempts to connect using V.42 LAPM error
control. If a V.42 LAPM connection fails, the modem
attempts to connect using MNP. If the modem cannot
connect using MNP, the connection fails.
V.42 or MNP or Normal (Auto-reliable Mode) — The
modem attempts to connect using V.42 LAPM error
control. If a V.42 LAPM connection fails, the modem
attempts to connect using MNP. If the modem cannot
connect using MNP, it will connect using Normal
mode.
Use \N4 (V.42 or Disconnect) for 4800 bps or
higher. Use \N7 (V.42 or MNP or Normal) for
2400 bps or lower.
May 1995
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