The Ridder LogicLink300 introduces a readymade and easy-to-use solution for installing and controlling motor gearboxes for ventilation and screen systems. The LogicLink300 is a control unit built on a motor gearbox and consists of three basic models: master, slave and stand-alone. Using the stand-alone gives the option to open or close screens or air vents individually by using a manual control unit or a climate computer with a 24v AC-DC signal. The master/slave combination allows control over several motor gearboxes simultaneously. One master unit is connected to a manual control box and/or climate computer. The master unit receives signals from the computer and passes them on to the slave units.