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HART

(Highway Addressable Remote Transducer) A widely used wired sensor network protocol that dates back to the Bell 202 standard in the 1980s. An extension to the 4-20 mA analog signal, HART superimposes a 1,200 bps signal onto the line that provides bi-directional communications with instruments in the field. See 4-20 mA and WirelessHART.



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