HART General Specification

HART (Highway Addressable Remote Transducer) provides digital communication to microprocessor-based (smart) analog process control instruments.  Originally intended to allow convenient calibration, range adjustment, damping adjustment, etc. of analog process transmitters; it was the first bi-directional digital communication scheme for process transmitters that didn't disturb the analog signal. HART has since been extended to process receivers, and is sometimes also used in data acquisition and control.  HART specifications continue to be updated to broaden the range of HART applications. 

HART was developed in the early 1980s by Rosemount Inc.  Later, Rosemount made it an open standard. As the de-facto standard for data communication in smart analog field instruments, HART is found in applications ranging from oil pipelines to pulp and paper mills to public utilities.  Among the many HART products now available are:

• Analog Process Transmitters
• Digital-only Process Transmitters
• Multi-variable Process Transmitters
• Process Receivers (Valves)
• Local (Field) Controllers
• HART-to-Analog Converters
• Modems, Interfaces, and Gateways
• HART-compatible Intrinsic Safety Barriers
• HART-compatible Isolators
• Calibrators
• Software Packages

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