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Simplex
A Simplex configuration is one in which more than two devices
are linked for communication using several IC-485AI units in a
manner similar to Multidrop. The difference is that in a Simplex
configuration, the Master device can only talk, and the Slave
devices can only listen.
Simplex uses reverse two wire cabling to link all the
connected IC-485AI units, as shown in the figure below:
For all 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).
For all of the units (Master and Slave), set SW7 ON; set SW8
ON.
Note: No more than 31 Slave units can be connected.
Master
T+
T
-
R
-
R+
Slave 1
R+
R -
T -
T+
Slave 2
R+
R -
T -
T+
Slave 3
R+
R -
T -
T+
:
:
Slave 31
PC1
COM1/
COM2
PC2
COM1/
COM2
PC3
COM1/
COM2
PC4
COM1/
COM2