3-9
Chapter 3. Wiring
• To use as DO or time proportional output:
• Pay attention to the polarity of the external power supply. Reverse
polarity connection may cause breakage.
• An overcurrent protection circuit is incorporated. If an overcurrent is
detected, the DO is forced OFF and an alarm is generated. The status of
the loads is checked every 5 seconds after overcurrent has been detected.
When the overcurrent status is canceled, the DO is restored automatically.

RS-485 (RS-485 communication port)
C1:
C2:
C3:
C4:
C5:
C1 and C2, and C3 and C4, are electrically continuous inside the port.
Use the ports for wiring in series and connect terminal resistors as shown in the
sample wiring diagram below.

Wiring example of 3-wire system device
Host station
DA (+)
1
2
3
DB (−)
This device (slave station)
This device (slave station)
This device (slave station)
4
5
DA (+)
1
2
3
DB (−)
4
5
DA (+)
1
2
3
DB
(
−
)
4
5
Shielded
cable
Shielded cable
Shielded
cable
DA (Data +)
DB (Data -)
SG
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