Inovance Monarch NICE-L-C-4037F

2 Installation and Wiring
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70
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5. Problems and Handling
1) Problem 1: Problem 1: Termination resistor connection
Host 1
Node
3
Node
N
120 Ω
Node
2
RS485 bus
…
120 Ω
󶙽Correct termination resistor connection diagram
NOTE
◆
The termination resistor can be connected only at two ends of the bus.
◆
When the resistance of the RS485 bus measured by the multimeter is about 60
󶍽

check whether another resistor is added; if yes, disconnect this one.

damaged.
2) Problem 2: Problem 2: Suppressing interference from external system
RS485
node not
grounded
RS
485 bus
PE cable
12
Power cables
󶙽Suppressing external interference
Handling method:
■
The measures of suppressing external interference are as follows: 1. The
recommended method is to add the magnetic ring at position 1, which can
󶍽
■
Adding the magnetic ring at position 2 can also suppress external interference.