Easy access to controller of VESTAS wind turbine, inside of the wind turbine. With the help of this device and the free program VESTAS Terminal you get a 100% control of the turbine. Connection is provided via the optical interface VESTAS wind turbine. This device allows working with the controller of the turbine by standards of USB (Universal Serial Bus) to VCP (Virtual COM Port) UART (Universal Asynchronous Receiver-Transmitter). This device can be used in every wind-turbine made by VESTAS, where an optical interface is given at the display and the control system.