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Modbus System Wiring with RST-5003 and Independent Power Supply
Modbus System Wiring with RST-5003 and POE or VDC Daisy Chain
IMPORTANT
: Your MNU IS sensor MUST be installed according to drawing 9005002
(Hazardous Installation Drawing) located at the back of the manual to meet listed approv-
als. Faulty installation will invalidate all safety approvals and ratings.
Modbus
Connection
Use Shielded Cable
Equivalent 270 Ω
terminating resistor
internal to RST-5003
270 Ω terminating resistor across A & B
terminals of last or only sensor, if necessary.
For installations
without IS barriers
only.
Connection to
network/Internet
RST-5003
Modbus
Controller
V+ / GND
A & B
Sensor 1
V+ / GND
A & B
Sensor 2
V+ / GND
A & B
Sensor 3
MNU IS sensor
MNU IS sensor
MNU IS sensor
Power Supply
+8-24 VDC / GND
Power to RST-5003 can be supplied via 12-24 VDC
or POE. If not using POE, use a single power supply
to both the RST-5003 and the MNU ISs.
Wiring T’s must be located on
controller/supply side of IS barriers.
See Hazardous Installation
Drawing for Intrinsically Safe
installation requirements.
Otherwise, wire directly.
See Hazardous Installation
Drawing for Intrinsically Safe
installation requirements.
Otherwise, wire directly.
See Hazardous Installation
Drawing for Intrinsically Safe
installation requirements.
Otherwise, wire directly.
Modbus
Connection
Use Shielded Cable
Equivalent 270 Ω
terminating resistor
internal to RST-5003
Connection to
network/Internet
RST-5003
Modbus
Controller
V+ / GND
A & B
Sensor 1
V+ / GND
A & B
Sensor 2
V+ / GND
A & B
Sensor 3
MNU IS sensor
MNU IS sensor
MNU IS sensor
+VDC
GND
Power must be supplied to RST-5003 via POE
(Power Over Ethernet) or 24VDC daisy-chain at
+VDC / GND terminals
270 Ω terminating resistor across A & B
terminals of last or only sensor, if necessary.
For installations
without IS barriers
only.
Wiring T’s must be located on
controller/supply side of IS barriers.
See Hazardous Installation
Drawing for Intrinsically Safe
installation requirements.
Otherwise, wire directly.
See Hazardous Installation
Drawing for Intrinsically Safe
installation requirements.
Otherwise, wire directly.
See Hazardous Installation
Drawing for Intrinsically Safe
installation requirements.
Otherwise, wire directly.
