485 wiring precautions:
1, 485 communication cable shielded twisted pair must, preferably multiple alternate, with a total length of not more than 1200 meters.
2. wiring as far away as possible from high-voltage power lines, not parallel with power cord, more cannot be tied together.
3.485 bus must be hand-bus structure, and resolutely check star connection and fork.
4, exceeds 30 controller or line grows up to 500 meters, 485 repeaters must be used.
5, AC-powered devices and the chassis must be real good earthing and grounding.
Shielded cable 6, will all 485 devices connect GND ground.
7. in the last 485 device 485 + and 485-and received 120 ohm termination resistors.
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