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For the Instrumentation, Automation and Industrial Application fanboys. And for anyone interested in communication protocols that are widely used but not commonly known.   I'm checking the Highway Addressable Remote Transducer Protocol interface on the DAC8775.     HART Protocol  The HART protocol communicates info on a current loop by adding a small AC component to the current loop. The frequency of that component defines that you're sending a mark (1200 Hz) or space ...