‑38‑
Item Specification
Cross sectional area
of the cable
26AWG
Cable category Twisted pair
Number of pairs 4
4.5 RS485 Communication Instructions
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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