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由于单片机性能稳定可靠，接口通道配置简单灵活，数据传输方便快捷，价格低等优点，从而为现场控制、数据采集和传输提供了很好条件。ＰＣ机计算能力强、容量大、具有良好的人—机界面等优点又是单片机无法比拟的。因此，在一个规模较大，计算、管理较复杂的系统中，采用ＰＣ机作上位机，多台单片机作下位机这样一个结构是一个比较好的选择。在我们最近完成的一个系统中，就是采用这种方式实现了一台ＰＣ机与多台单片机的远距离多机通信。
Due to the stable and reliable performance of the single-chip microcomputer, simple and flexible interface channel configuration, convenient and fast data transmission and low price, it provides good conditions for on-site control, data acquisition and transmission. PC computing power, large capacity, has a good man-machine interface, but also the advantages of SCM unmatched. Therefore, in a larger, more complex computing and management system, using a PC as a PC, a number of single-chip microcomputer for the next crew such a structure is a better choice. In one of our recently completed systems, this approach enabled long-range, multi-machine communication between a PC and multiple microcontrollers.