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I have never in my life encountered serial protocols that require microsecond timing. Pretty much every serial thing I've ever had to deal with runs RS232, and I have seen RS232 run a thousand feet on f'n lamp cord. The 'real' stuff uses Arduino because it has a much longer lineage and a lot more devkit support. The 'fake' stuff runs RaspPi because it was deliberately designed for frivolous uses by people afraid of programming. Not that there's anything wrong with that. They both spook the shit out of me.