Omron NV Series Setup Manual page 93

Wiring the Power Supply and Serial Communications
RS-485 Connections
Note
RS-485 (+)
RS-485 (−)
Power supply (+)
Power supply (−)
RS-485 (2-wire) cannot be used to connect to a Serial Communications
Board/Unit using the Host Link protocol. Use RS-422A (4-wire).
■ Connecting to EJ1 Temperature Controllers Using RS-485
EDU in EJI Modular
Temperature Controller
EJ1
EDU
Model Model with
with connector
screw terminal
terminals block
6 7 +
7 8 -
8
9 +
9 10 -
To 24-V
power supply
Up to 31
Temperature
EDU
Controllers can
be connected.
*1
+
-
+
-
To 24-V
power supply
NV
To 24-V
power supply (RS-485)
Pin Signal
1 +
−
2
3 FG
4 +SD
−SD
5
6 +RD
−RD
7
8 E
*1 Connect a terminating resistance
of 110 to 125 Ω to the last EJ1
Temperature Controller.
Section 4-4
NV
To power
+
supply
−
+SD
-SD
+RD
-RD
E
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