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Line 16: The protocol was developed by [[Rosemount Inc.]], built off the [[Bell 202 modem\|Bell 202]] early communications standard in the mid-1980s as a proprietary digital communication protocol for their smart field instruments. Soon it evolved into HART and in 1986 it was made an [[open protocol]]. Since then, the capabilities of the protocol have been enhanced by successive revisions to the specification. ==Modes~~(unknown)~~== [[File:Smart current loop positioner.png\|thumb\|Example of current loops used for sensing and control transmission. The HART protocol can be overlaid on the 4–20 mA loops.]] There are two main operational modes of HART instruments: point-to-point (analog/digital) mode, and multi-drop mode.

Highway Addressable Remote Transducer Protocol: Difference between revisions