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For the case RS-422 interface can not directly communicate with 1553B bus interface with high reliability, a interface and fault-tolerant design based on BU-61580 bus controller is proposed . The design uses 1553B interface chip BU-61580 that complets interface control and data processing between RS-422 and 1553B by FPGA control. On the basis of the design of the hardware interface, it completes BU-61580 chip configuration by designing IP-CORE, and improves the reliability of data communication of bus controller increasing the fault-tolerant design.The test results show that communication is controller and stable with bus controller and RT terminal,and it is used in a test system.