Jogesh Warrior: Process I/O to fieldbus interface circuit. Rosemount, Westman Champlin & Kelly P A, June 9, 1998: US05764891 (133 worldwide citation)

A field device such as a transmitter in a process control system includes conversion circuitry coupled between Fieldbus interface circuitry and transmitter interface circuitry. The transmitter includes a transducer for sensing a process variable and providing a transducer output. Measurement circuit ...