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详细描述了现场总线速度和效率及其影响因素，对现场总线的实际速度和实际效率进行了定义，并通过应用实例对串行异步通信的总线问题进行了具体的讨论。
The speed and efficiency of fieldbus and its influencing factors are described in detail. The actual speed and actual efficiency of fieldbus are defined. The bus of serial asynchronous communication is discussed in detail by application example.