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What is HART Protocol and which module supports HART Protocol.

The Highway Addressable Remote Transducer (HART) protocol provides digital communication to microprocessor-based
analog process control instruments. HART uses the Bell 202 frequency-shift-keying (FSK) standard to superimpose a digital
signal on top of the 4-20mA current loop analog signal:
1)The analog signal communicates the primary measured process variable value.
2)The digital signal communicates additional instrument information including
    instrument status, additional process variables, configuration data, and diagnostics.

The digital signal shifts between a frequency of 1200 Hz (representing a binary 1) and a frequency of 2200 Hz (representing a binary 0)

HART communication is half-duplex in design and HART is a master-slave protocol. HART-slave responds only when commanded by a HART master.
Schneider STB AHI 8321 supports HART protocol

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