APG MNU Slave Sensor user manual - Manual (Page 9)

Rev. B1, 5/13 MNU Series Ultrasonic Sensors
9
Automa! on Products Group, Inc.
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• Wiring
Always use shielded cable. It is recommended that twisted-pair cable be used
between sensors when connec! ng mul! ple sensors to the Modbus network.
NOTE: Always use a high quality power supply that will deliver clean, stable
voltage.
The MNU series sensors are wired in a daisy-chain confi gura! on, as shown
below. Each sensor should be connected individually and assigned a unique
address before wiring the sensor into the Modbus network.
Power
Supply
Master
Device RS-485 A
RS-485 B
Vdc
Vdc
+
-
Sensor 1
V+ V- A B
Sensor 2
V+ V- A B
Sensor 3
V+ V- A B
Use Shielded Cable
120 Ohm
Terminating
Resistor
120 Ohm
Terminating
Resistor
Modbus Daisy-Chain Wiring
Mirco Connector:
Pin 1 (Brown)
+24 VDC
Pin 2 (White) RS-485 A
Pin 3 (Blue) DC Common
Pin 4 (Black) RS-485 B
4-Conductor Cable:
Red
+24 VDC
Black DC Common
White RS-485 A
Green RS-485 B