RS485 is a 120 ohm half-duplex communication.
Maximum can support 32 devices on a bus.
Based on using 24V WG (0.56mm) twisted-pair, the maximum transmission distance as
2400 bps - 1800 m
4800 bps - 1200 m
9600 bps - 800 m
What's the standard for RS485 CCTV Camera Pan-tilt Control
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