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本文提出了一种微机通信技术中常见的多级异步串行通信问题，并利用RS-485协议构造了－种具有中间通信中继器的树状异步串行通信系统。在实际应用中，这种系统的带载能力可以达到1：1000，通信距离可以达到2公里以上。
In this paper, we propose a common multi-level asynchronous serial communication problem in microcomputer communication technology, and use RS-485 protocol to construct a dendroidal asynchronous serial communication system with intermediate communication repeaters. In practical applications, the system carrying capacity can reach 1: 1000, communication distance can reach more than 2 km.