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2. Point-to-Point 2 Wire Half Duplex
Point-to-Point Half Duplex uses straight through two 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
OFF
and SW8
ON
for both units. They are now
configured for RS-485 Auto Send Data Mode (see p. 15 for
RS-485 operation details).
Multidrop
A Multidrop configuration is one in which more than two devices
are linked for communication using several IC-485AI units. One
of the devices that one of the IC-485AIs connects to is designated
as the
Primary
device. All the remaining devices that the rest of
the IC-485AIs connect to are designated as
Secondary
devices.
Up to 31 Secondary devices can be connected. There are two
configurations: Multidrop Full Duplex and Multidrop Half Duplex.
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
Содержание IC-485AI
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