Electrical connection
LPGmass Modbus RS485
28
Hauser
7.3
Special connection instructions
7.3.1
Connection examples
Modbus RS485
Modbus RS485 intrinsically safe
2
1
A
B
3
A
B
L+
L-
L- L+
A
B
5
6
7
4
8
A
B
L+
L-
A0028766
11
Connection example for Modbus RS485 intrinsically safe
1
Control system (e.g. PLC)
2
Cable shield, observe cable specifications
3
Safety Barrier Promass 100
4
Observe cable specifications
5
Non-hazardous area
6
Non-hazardous area and Zone 2/Div. 2
7
Intrinsically safe area
8
Transmitter
7.4
Hardware settings
7.4.1
Enabling the terminating resistor
Modbus RS485
To avoid incorrect communication transmission caused by impedance mismatch, terminate
the Modbus RS485 cable correctly at the start and end of the bus segment.