HART is a master-slave field communications protocol.
HART stands for Highway Addressable Remote Transducer
HART Communication is a bi-directional industrial field communication protocol used to communicate between intelligent field instruments and host systems. HART is the global standard for smart process instrumentation and the majority of smart field devices installed in plants worldwide are HART-enabled. The global installed base of HART-enabled devices is the largest of all communication protocols at more than 20 million. HART technology is easy to use and very reliable.
HART is a master-slave field communications protocol developed in the late 1980's to facilitate communication with Smart field devices. HART stands for Highway Addressable Remote Transducer. The HART protocol makes use of the Bell 202 Frequency Shift Keying (FSK) standard to superimpose digital communication signals at a low level on top of the 4-20mA:
