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I am currently working on an offshore oil project, the specifications for the job state that the owners prefer "smart" transmitters. I have researched the term for two days now, but I have yet to find a formal definition of "smart". One article referred to HART as the de facto communication standard for "smart" transmitters. Is "Smart" a trademark name? What is the definition of "smart" technoology? De facto implies that HART is not exclusively tied to "Smart", if this is so what are other communication protocols?