首先对计轴系统的基本原理进行了介绍，并根据应用环境对计轴系统进行了分类。
Firstly, this article introduces the basic principle of axle counter system, and put forward a classification of the system based on application environment.
本文分析了AZL90型计轴系统通信结构存在的不足，提出采用星型拓扑结构对其进行改进的一种思路。
The paper analyzes the problems with AZL90 axle counter communication structure, and puts forward an idea for solving these problems with star topology.
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