The HART Device Description (DD) file describes specific features and functions of a device. ![]() A host can be any software application from a technician’s hand-held device or laptop to a plant’s process control, asset management, safety or other system using any control platform. The bi-directional communication provides digital data access between field instruments and host systems. The HART protocol enables two-way digital communication over the same wires as the 4-20mA analog signal without disturbing the 4-20mA signal.
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