Each version of the HART protocol improves on the last. Thus, the advent of the HART 7 brought optimized wireless networking and unified wired and wireless connections. It also added benefits like exception reports and synchronized sampling. Have a look at the graphic below for a comparison of HARTs 5, 6, and 7. This should give you some sense of HART 7 benefits.

HART 7 benefits
The HART evolution – Copyright HART Foundation

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