Basics of the HART Communication Protocol -Working principle

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The worldwide accepted standard for analog signals in the measurement industry is the 4 to 20mA signal. One key drawback of this signal standard is that it can only transmit one parameter or measured value.

A two-way or bidirectional communication protocol, which addresses this drawback, has been developed with which additional information can be transmitted using an alternating current signal superimposed on the 4 – 20mA analog signal. This system is called the HART communication protocol. HART stands for: Highway Addressable Remote Transducer. 

The HART communication protocol has become a widespread solution, allowing for convenient and efficient parameterization of smart (intelligent) measuring devices. Additionally, device-specific diagnostic data can be read which provides information about the device's physical health and allow for predictive maintenance. Monitoring various device parameters is also possibility with the HART protocol.
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