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Module 4: DAQ Systems

20262m

RS-485 is preferred when:

(i) Analog filtering is required
(ii) Only one sensor is used on a PCB
(iii) Wireless communication is required
(iv) Long-distance and multi-point communication is required

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Answer: (iv) Long-distance and multi-point communication is required

RS-485 uses differential signalling, so it works up to about 1200 m with good noise immunity and supports up to 32 or more nodes on one bus.

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