Electrical Installation
‑154‑
Figure 7‑56 Recommended wiring for the cabinet system
7.6 Communication Connection
7.6.1 RS485 Wiring
RS485 communication connection with PLC
Use a three‑conductor shielded cable to connect the RS485 bus, with the three
conductors connected to 485+, 485‑, and GND respectively. Connect 485+ and 485‑
with two conductors twisted together and connect the remaining conductor to the
reference ground (CGND) of RS485. Connect the shield to the device GND. Connect a
120 Ω termination resistor on each end of the bus to prevent RS485 signal reflection.
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