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Microcontroller Drives a Smart and Intelligent 4-20mA Transmitter

The 4-20mA current loop is a common technique for transmitting sensor information in industrial process-monitoring applications. (Sensors measure physical parameters such as temperature, pressure, speed, and liquid flowrates.)

Current-loop signals are relatively insensitive to noise, and their power can be derived from a remotely supplied voltage. This makes current loops particularly useful when the information must travel a long distance to a remote location.

View it here: http://www.maxim-ic.com/appnotes.cfm?an_pk=3653

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