Highway Addressable Remote Transducer Protocol: Difference between revisions

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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.

HARTBased is a inon the [[OSI model]], HART resides aat Layer 7, the Application Layer. Layers 3–6 are not used.<ref>instrumentationtools ''https://instrumentationtools.com/hart-communication-tutorial-part-3/'' </ref> When sent over [[current loop|4–20&nbsp;mA]] it uses a [[Bell 202 modem|Bell 202]] for layer 1. But it is often converted to RS485 or RS232.

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;bit 7, if high use Unique (5 byte) address, else use PolingPolling (1 Byte) addresses.

;bit 6 and 5, Number of Expansion bytes: normally it set if Expansion field is used, normally 0.

;bit 4 and 3, Physical layer type: 0=Asynchronous, <br> 1=Synchronous

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==External links==

* [http://www.FieldCommGroup.org/ FieldComm Group]

* [http://hartprotocollite.codeplex.com/ .NET Open Source project] {{Webarchive|url=https://web.archive.org/web/20171223221824/http://hartprotocollite.codeplex.com/ |date=2017-12-23 }}

{{List of automation protocols}}