What is the significance of "4-20 mA" signal in hart protocol?
Answers : 1 | Votes : 1145| On : 2013-08-10
bibuthomas : The HART protocol is an old Frequency Shift Keying way of sending data, typically from highway sensors.4-20 ma loops are a way to send an analog value, like temperature or position, over a pair of wires. It is simple on the surface, 4 mA is the minimum, and 20 mA is the maximum of the range.
On : 2020-08-10