Datasheet

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2. Multidrop Half Duplex
 Multidrop Half Duplex uses straight-through four wire
cabling, to link all the connected IC-485S / IC-485SI units:
 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 IC-485S / IC-485SI units set SW2 to TxRTS,
RxRTS
.
Note: The RTS signal is controlled by an external software
command.The IC-485S / IC-485SI has no capability to
control this signal by itself.
Master
T+
T
-
R
-
R+
Slave 1
R+
R -
T -
T+
Slave 2
R+
R -
T -
T+
PC1
COM1/
COM2
PC2
COM1
/
COM2
PC3
COM1
/
COM2
Slave 3
R+
R -
T -
T+
.
.
Slave 31
PC4
COM1
/
COM2