轨道交通控制系统中的异步串口扩展技术研究

The Research of Asynchronous Serial Port Expansion for Rail Transit Control System

为解决上海轨道交通1号线在人民广场站实现列车双向开门以加快客流疏散问题,提出采用串行口扩展技术的方法。总结异步串口的多种扩展方法及优缺点,介绍基于SPI接口的串口扩展芯片GM8142,设计了基于GM8142的串口扩展电路和控制软件,并应用到轨道交通红外线车地通信设备中。相比其他串口扩展技术,其具有结构简单,使用灵活、误码率低,可靠性高的特点。

This paper puts forward using the method of serial port expansion technique to solve the problems of two-way opening of the trains in Shanghai rail transit line 1 at people＇s Square, In order to accelerate the passengers. The paper sums up the method of serial port expansion, introduced serial port expansion chip GM8142 which based SPI communication, designed hardware and the software for the serial port expansion based on GM8142. Compared with other serial port expansion technology, the structure is simpler, the use is more flexible, the error rate is lower, and the reliability is higher.