HART (Highway Addressable Remote Transducer) is a digital communication protocol which operates on top of a conventional 4-to-20mA current loop signal from a measurement device - a transmitter - or to a valve positioner.
HART uses a low-level frequency-shift-keyed sine-wave signal to convey the digital communication.
Also tracks Fieldbus info.
preview:
http://www.romilly.co.uk/
5/7/2001
