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Line 12: The '''HART Communication Protocol (Highway Addressable Remote Transducer)''' is a hybrid analog+digital industrial automation open protocol. Its most notable advantage is that it can communicate over legacy 4–20 mA analog instrumentation current loops, sharing the pair of wires used by the analog-only host systems. HART is widely used in process and instrumentation systems ranging from small automation applications up to highly sophisticated industrial applications. HART is a in the [[OSI_model]] a Layer 7, Application. Layer 3-6 is not used.<ref>instrumentationtools ''https://instrumentationtools.com/hart-communication-tutorial-part-3/'' </ref> When ~~sendt~~sent over [[current loop\|4–20 mA]] it uses e [[Bell 202 modem\|Bell 202]] for layer 1, Physicals. But is often convert to RS485 or RS232.

Highway Addressable Remote Transducer Protocol: Difference between revisions