3 * The FrSky XSRF4O flight controller with integrated Frsky X8R Receiver, OSD and SD Card in one board
4 * Webpage: https://www.frsky-rc.com/product/xsrf4o/
11 * Hardware UARTS: 3(UART1-->SBUS UART6-->S.PORT)
17 * Quads (Navigation available only with DJI NAZA GPS)
18 * Airplanes (up to 4 servos available on S2-S6)