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1. Multidrop Full Duplex
Multidrop Full Duplex uses reverse four 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 the Master unit, set SW7 ON; set SW8 ON (RS-422
Master mode).
For all of the Slave units, set SW7 ON; set SW8 OFF (RS-
422 Slave mode).
Note: 1. No more than 31 Slave units can be connected.
2. When any of the Slave units transmits data, none of the
other Slaves may transmit. RTS for all other Slave units
must be pulled low.
Master
T+
T
-
R
-
R+
Slave 1
R+
R -
T -
T+
Slave 2
R+
R -
T -
T+
.
.
.
Slave 31
PC1
COM1/
COM2
PC2
COM1/
COM2
PC3
COM1/
COM2