The Highway Addressable Remote Transducer (HART®) protocol is used in many factory automation and control systems. This protocol uses the established 4-20mA loop to send digital signals between a smart transmitter and a host for data that can be used for control, monitoring, or safety. This application note starts with an overview of 4-20mA systems and HART transmitters and discusses the protocols for developing HART enabled devices. This application note also discusses different TI devices with HART connectivity.
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