A
telecommand is a command sent to control a remote system or systems not directly connected (e.g. via wires) to the place from which the telecommand is sent. The word is derived from
tele = remote (
Greek), and
command = to entrust/order (
Latin). Systems that need remote measurement and reporting of information of interest to the system designer or operator require the counterpart of telecommand,
telemetry. The
telecommand can be done in
real time or not depending on the circumstances (in space, delay may be of days), as was the case of Marsokhod.
