‑35‑
■ Wiring
Select the communication cable according to "
4.1 Cable Selection
"
on page 32
. Insert
the communication cable to the communication port.
4.3 Instructions on RS485 Communication
It is recommended to use a shielded twisted pair cable as the RS485 bus. Connect a
120 Ω termination resistor to both ends of the bus respectively to prevent signal
reflection. Connect the signal reference grounds of all nodes together. Up to 31 nodes
can be connected and the distance between nodes must be less than 3 m.
The RS485 bus topology is shown in the figure below.
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