In view of the fact that the sensor needs to be simulated and tested before the launch of the aircraft to verify the normal operation of each function,a data link message reading module is designed,which takes FPGA as the control core and combines HDLC message reading protocol.It includes two synchronous RS-422 communication interfaces based on HDLC communication protocol,two data communication interfaces based on UART communication protocol and two passive command interfaces.The experiment results show that the functions of each communication interface can realize the accurate transmission of digital data.
Key words
HDLC /
UART /
RS-422 /
digital quantity /
passive instruction
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