What is HART protocol and what are its benefits?

HART (Highway Addressable Remote Transducer) overlays digital communication on 4-20mA signal. Benefits: access multiple variables (pressure and temperature from one transmitter), remote configuration and calibration, diagnostic data transmission, asset management integration, and backward compatibility with existing 4-20mA infrastructure. Supports multidrop mode (multiple devices on one wire, digital only). WirelessHART extends to wireless. HART 7 adds enhanced diagnostics. Provides device health monitoring, reducing maintenance needs. Communicator or asset management software interfaces with devices.