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What is meant by HART Communication?

Hart Communication is a standardized method of additionally transferring bi-directional communication on an analog measuring value. The modulation and the data log are defined exactly in the specifications of the HART Communication Foundation.

This is an FSK signal which is modulated in the measuring transducer to the measuring value, 4 - 20 mA output current of the transmitter. A HART modem is installed in the process controller; it transports the transmitted digital data to a process computer.

The great advantage of this concept is that the analog measured value can be evaluated conventionally. Furthermore, but without any additional cabling work, all kinds of information such as measured values, configuration data or set parameters can be made available to the user in digital form.

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