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2. Multidrop Half Duplex
Multidrop Half Duplex uses reverse two wire cabling, to link all
the connected IC-485AI units:
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 set SW7 and SW8 according to the
table on p.9 to configure each unit’s RS-485 operating
mode (see p.10 for RS-485 operation details).
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+
PC1
COM1/
COM2
PC2
COM1/
COM2
PC3
COM1/
COM2
Slave 3
R+
R -
T -
T+
.
.
Slave 31
PC4
COM1/
COM2