The energy saving device (2) starch the facsimile energy saving operation and secures the energy saving under preset conditions. The main control covers the entire facsimile appts operation and transmits an energy saving signal to the device, with the signal indicating steps to be carried out by the device. The energy saving device transmits a cessation signal for the main control, indicating the preset condition for the energy saving operation to be closed. Pref during the energy saving cycle no energy is supplied to the main control.
