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HART Communication

Introduction of the scheme

The two-wire analog 4/20mA current loop became a standard for industrial control instrumentation in the mid-1970s. In the next decade, microcontrollers (MCU) started to be used by many intelligent control instruments. More and more information are transmitted between the equipments. Highway Addressable Remote Transducer (HARTTM) fieldbus standard is compatible with the 4/20mA analog system. It is used in a wide range of applications, and has become the de facto international standard in the field of intelligent industrial control.

HART works in half-duplex communication mode. Digital signal communication is realized on top of the existing analog signal transmission line. Products with such capability have strong competitive advantage over the pure analog system.

SD2015 HART modem IC from Hangzhou SDIC Microelectronics is used in the HART communication module of intelligent field instruments. It offers simple peripheral circuitry and high operational reliability.

Application Characteristic

Application block diagram

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