FC-18 is a display on/off controller for 4K HDR HDMI signals. It accepts and outputs an HDMI signal after reclocking and equalizing. On detection of the onset of an input signal FC-18 sends an "on" command to the display or projector and on detection of the loss of the input signal FC-18 sends an "off" command. FC-18 can also be used to control a display device manually via front panel buttons, Ethernet or contact closure switches.