HART over Legacy 4–20 mA Signal Base

Authored by: Mark Nixon , Wally Pratt , Eric Rotvold

Industrial Communication Technology Handbook

Print publication date:  August  2014
Online publication date:  August  2014

Print ISBN: 9781482207323
eBook ISBN: 9781482207330
Adobe ISBN:

10.1201/b17365-9

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Abstract

A Highway Addressable Remote Transducer (HARTTM) [1] device is a microprocessor-based process transmitter or actuator that supports two-way communications with a host, digitizes the transducer signals, and digitally corrects its process variable (PV) values. The HART digital signal is modulated on to the 4–20 mA signal at a higher frequency and then observed by process control equipment.

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