4-5
Chapter 4. WIRING
Connection of open collector output to digital input
16
17
18
5 V
Connection of communication (RS-485) cable
z
3-wire system
16
17
18
16
Master station
DA
DA
DB
DB
SG
SG
SG
FG
+
-
This unit (slave station)
This unit (slave station)
Shield
Shield
17
18
IMPORTANT
Terminating resistor
• Do not connect any terminating resistor to both ends of the
communication path. Doing so might cause the communication to fail.
• Even though any units requiring the terminating resistor exist in the
communication path, do not connect any terminating resistor.
Handling Precautions
• Do not connect DA and DB. Doing so might cause damage to this unit.
• Ground the shield line to one point on one side of the cable.
• Be sure to connect SG terminals each other.
Failure to do so might cause unstable communications.
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