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what is the difference about HART, and 4-20mA signal?
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Answer Posted / mujahid/dinesh
HART compatible transmitter transmits digiatl signal super-
imposed on analog 4-20 mA signal and gives many useful
infoarmation about the transmitter and process parameter
other than output.
this enables a two way field communication to take place,
making it possible for additional info rather than the
process variable only.
Hart protocol is a Master/Slave protocol, the HART protocol
can be used in different modes like point to point or
multidrop for communicating info from/to smart fiel device
and the controller, the field device and the controller
should be HART enabled.
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