Omron NV3Q Connection Manual page 133

Modbus Slave (RTU Mode)
Connection diagram
RS-422A Connections
PLC
(Modbus-RTU Master)
Signal
+RD
−RD
+SD
−SD
RS-485
1:1 Connections
PLC
(Modbus-RTU Master)
Signal
+
−
Terminating resistance
120 Ω
To power
PT (Modbus-RTU Slave)
supply
Pin No.
1
2
3
NC (or FG)
4
5
6
7
8
Connect.
To power
PT (Modbus-RTU Slave)
supply
Pin No.
1
2
3
NC (or FG)
4
5
6
7
8
Connect.
Section 11-1
PT
NV3W, NV4W, or
NV3Q for RS-422A
Signal
+
−
+SD
−SD
+RD
−RD
E
NV3W, NV4W, or
NV3Q for RS-485
Signal
+
−
+SD
−SD
+RD
−RD
E
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