This paper introduces IRIG-B code format and the structure of hardware, and the program of the system is also given.
笔者对IRIG - B码的格式作了详细介绍，并给出了系统部分硬件组成和软件编程图。
The synchronization principle of IRIG-B code is analyzed. When applying IRIG-B code in substation IED, neither communication messages of fieldbus nor multiple pulse signals of GPS are needed.
分析了B码的对时机理，指出变电站的智能设备采用B码对时，就不再需要现场总线的通信报文对时，也不再需要GPS输出大量脉冲接点信号。
The paper introduces the time synchronization conception of the IRIG-B format code and its module constructions which include microprocessor, level converter and optically coupled isolator.
介绍了IRIG-B码对时的概念、IRIG-B码对时模块的组成，其组成部分包括微处理器、电平转换器件、光耦隔离器。
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