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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

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 circuitry couples to the transducer output, processes the transducer output and provides a measurement output. The transmitter interface circuitry couples to the measurement circuitry and provides an interface output representative of the measurement output. Further, the transmitter interface circuitry receives a transmitter command and responds in accordance with the transmitter command. The Fieldbus interface circuitry is adapted to couple to a process control loop which operates in accordance with the Fieldbus standard.

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[ What is claimed is:] [1.] A transmitter in a process control system, comprising:a transducer for sensing a process variable and providing a transducer output;measurement circuitry coupled to the transducer output to process the transducer output and provide a measured output;transmitter interface

[ What is claimed is:] [1.] A transmitter in a process control system, comprising:a transducer for sensing a process variable and providing a transducer output;measurement circuitry coupled to the transducer output to process the transducer output and provide a measured output;transmitter interface circuitry coupled to the measurement circuitry adapted to provide an interface output representative of the measured output and to receive a transmitter command and respond in accordance with the transmitter command;Fieldbus interface circuitry adapted to couple to a process control loop operating in accordance with the Fieldbus standard, the Fieldbus interface circuitry coupled to I/O registers supporting Read, Write, Control and Event data, the Fieldbus interface circuitry responsively writing Fieldbus data received from the process control loop into the I/O registers and responsively transmitting Fieldbus data on the process control loop data read from the I/O registers; andconversion circuitry coupled between the Fieldbus interface circuitry and the transmitter interface circuitry adapted to write data into the I/O registers, related to the interface output received from the transmitter interface circuitry.