Remote control unit, control method and control device of remote control unit and air conditioner system

The invention discloses a remote control unit, and a control method and control device of the remote control unit. The method comprises following steps that whether the remote control unit is in the code sending state or not is detected; if it is detected that the remote control unit is in the code sending state, the backlight brightness of the remote control unit is controlled to be at the first brightness; if it is detected that the remote control unit is not in the code sending state, the backlight brightness of the remote control unit is controlled to be at the second brightness, and therefore the phenomenon that when the remote control unit sends codes, the voltage of a remote control unit battery is greatly reduced can be avoided, energy-saving performance of the remote control unit is improved, the service life of the remote control unit battery is prolonged, and the product competitiveness is improved. The invention further discloses an air conditioner system. 本发明公开了种遥控器及其控制方法和控制装置，方法包括以下步骤：检测遥控器是否处于发