ABSTRACT
The Highway Addressable Remote Transducer (HART) fieldbus standard has been in existence since the late 1980s. It is a bidirectional communication protocol that provides data access between intelligent field instruments and host systems. Applications utilizing HART devices include traditional monitoring and process control, safety applications, asset management, and equipment health monitoring applications. There are many HART commands. This chapter describes the classification and usages of these commands. Burst mode allows the master to instruct the slave device to continuously broadcast a standard HART reply message. Block data transfer allows devices such as valves, vibration monitors, and analyzers to transfer blocks of information. Wireless HART extends the application of HART communications by enhancing the HART technology. At the application layer, HART uses commands for data exchanges. The chapter also describes the wired and wireless communication layers. Wireless HART handheld is the natural progression of the wired HART handheld.
