Answer
The term HART in HART protocol stands for “Highway Addressable Remote Transducer” which is an open standard protocol used worldwide to transmit & receive digital data with analog wiring in between smart devices & control systems. This protocol is used to establish communication among host systems as well as smart field devices in industries.
HART protocol gained more popularity due to its capability to support the older 4-20 mA based analog protocol,
while including the major advantages of digital smart instrumentation HART Protocol Architecture
HART protocol operates in two network configurations like
1.point to point and
2.multi-point
How Does HART Communication Work?
The HART communication protocol uses the Bell 202 FSK (Frequency Shift Keying) standard to superimpose digital signals which are represented with two different frequencies like 1,200 Hz & 2,200 Hz. Here, 1,200 Hz frequency represents bit 1 whereas 2,200 Hz frequency represents bit 0 correspondingly.
Where is it used onboard- ME engines- Exh vv inductive sensor, Fuel booster plunger position sensor.