Datasheet

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Simplex
A Simplex configuration is one in which more than two devices
are linked for communication using several IC-485S / IC-485SI
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-485S / IC-485SI units, as shown in the figure
below:
 For all IC-485S / IC-485SI units, set SW1 to DCE or DTE
depending on what type of device the IC-485S / IC-485SI
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 SW2 to TxON,
RxON.
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