FIELD: alternating process transducers, which are supplied by two or three wires and are connected to controller through third wire. SUBSTANCE: transducer transmits alternating current signals to first peripheral device and receives them from it and transmits direct current signals to second peripheral device. Transducer has sensor unit and communication unit which are supplied from power terminal and generic point of transducer. Communication unit receives output signal of sensor unit, which describes process variable, and transmits alternating and direct current signals to signal terminal, which is connected to both peripheral devices, and also receives alternating current signals from first peripheral device. Signal of direct current describes process variable, while alternating current signal serves as digital representation of this process variable and transducer data selected by received alternating current signal. EFFECT: matching output signal describing alternating process to peripheral device which receives alternating current signals, generation of direct current output signal. 6 cl, 7 dwg
