Highway Addressable Remote Transducer Protocol: Difference between revisions

Revision as of 11:35, 25 May 2023

Revision as of 04:13, 28 May 2023

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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 over [[current loop|4–20&nbsp;mA]] it uses e [[Bell 202 modem|Bell 202]] for layer 1, Physicals. But is often convert to RS485 or RS232.