Telemetry

Telemetry is a technology that allows the remote measurement and reporting of information of interest to the system designer or operator. The word is derived from Greek roots tele = remote, and metron = measure. Systems that need instructions and data sent to them in order to operate require the counterpart of telemetry, telecommand.

Telemetry typically refers to wireless communications (i.e. using a radiofrequency system to implement the data link), but can also refer to data transfer over other media, such as a telephone or computer network or via an optical link.

http://en.wikipedia.org/wiki/Telemetry

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