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How a lightning can affect a optical isolated RS 485 bus?

Answer:
Because of the very high voltage of lightning, an opto isolator can't block it, the best is to relay any lightning to ground but that is still not a guarantee that the spike will be stopped. Lightning voltage is in the Giga Volt range.
Contributor: Chrismicro
First answer by Chrismicro. Last edit by Chrismicro. Contributor trust: 185 [recommend contributor recommended]. Question popularity: 1 [recommend question].

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