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3
Chapter
Wiring
■
RS-485
•
Please use a shielded twist pair cable. (Recommended cable: KPEV-SB (made by The Furukawa Electric Co., Ltd.))
•
The maximum cable length should be 500m. One master and up to thirty-one micro controllers (slaves) can be connected per
circuit.
•
Te r minate both ends of the circuit with a terminating resistance of 100
Ω
(1/2W or more).
•
Ground the shielded cable once towards the master side.
•
SG does not have to be connected, but it can be used as an effective countermeasure against communication errors due to
noise.
Master
SG
Slave
+
–
+
–
Shielded twist pair cable
Te r minating resistance
100W (1/2W)
Te r minating resistance
100W (1/2W)
PXG Series
PXG Series
PXG Series
RS-485 interface
or
RS-485 side of
RS-232C to RS-485 converter
+
–
+
–
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