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Operating Modes
The IC-485AI supports three operating modes: Point-to-Point;
Multidrop; and Simplex. Point-to-Point and Multidrop can be
configured for Full or Half Duplex. Each of the operating modes
is explained below.
Point-to-Point
A Point-to-Point configuration is one in which two devices,
located at two different places are linked for communication by a
pair of IC-485AI units. There are two configurations: Point-to-
Point Full Duplex, and Point-to-Point Half Duplex.
1. Point-to-Point 4 Wire Full Duplex
Point-to-Point Full Duplex uses reverse four wire cabling,
as shown in the diagram below.
For both IC-485AI units, set the unit to DCE or DTE
depending on what type of device the IC-485AI will plug
into (if it will plug into a DCE device, configure it for DTE,
and vice versa)
Set SW7 and SW8 ON for both units. They are now
configured for RS-422 Master operation.
T+
T-
R-
R+
R+
R-
T-
T+
Connect
to PC#1’s
COM port
Connect
to PC#2’s
COM port
DB-25 DB-25