‑37‑
■ Ethernet communication
To improve the reliability of communication, Cat5 shielded twisted pair cables with
an iron shell must be used.
● Insert the registered jack on the cable into the Ethernet port (RJ45 interface) until
a click is heard.
● To remove the RJ45 network cable, press and hold the tail of the registered jack,
and then pull it out along the direction parallel with the module.
4.4 RS485 Communication
It is recommended to use a shielded twisted pair cable for the RS485 bus. Connect a
120 Ω termination resistor to both ends of the bus to prevent signal reflection.
Connect the signal reference grounds of all nodes together. Up to 31 nodes can be
connected and the distance between branches must be less than 3 m.
The RS485 bus topology is shown in the figure below.
To avoid interference, do not bundle the cable together with an AC power cable or
high voltage cable.
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