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According to the requirements of serial communication interface and internal communication capability of the serial input and output unit in the flight control computer of the sample unmanned aerial vehicle (UAV), the schematic and driver software of the serial communication unit based on FlexRay bus are designed, and FlexRay protocols and redundant management are realized in three aspects:slot allocation, bus redundancy and non-redundant data transmission. Using FPGA as the processor, in accordance with the communication protocols of FlexRay bus, the unit completes data transmission between serial communication unit and central processing unit, which realizes real-time communication between external devices and the flight control computer, and ensure the busload less than 20%. The test verifies the correctness and practicability of the design, which can reach the design targets and meet the serial communication demands of the sample UAV flight control computer.