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Communication with machinery and control and measuring instruments is the basis of industrial automation. The oldest communication technique implemented is a current loop with a normal range of 4 mA to 20 mA. By employing a transmitter, a receiver and a power supply, it is possible to transmit process variable data. However, the single loop allows only one-way communication from a sensor to an actuator. Developed in the mid-1980s, the HART protocol allows two-way communication of additional information