本文主要介绍一种使多个数据终端设备(DTE)通过RS232接口,共享一个数据通信设备(DCE)的异步通信接口共享电路,又可称为串行接口分配网络。 一、引言 RS232接口是一种在工业控制及通信领域广泛采用的异步通信接口标准,数据终端设备和数据通信设备的连接都严格依赖于该标准。当距离比较近时(小于20米),两 This article mainly introduces an asynchronous communication interface sharing circuit that enables multiple data terminal equipment (DTE) to share one data communication device (DCE) through an RS232 interface, which is also called a serial interface distribution network. I. INTRODUCTION The RS232 interface is a standard for asynchronous communication interface that is widely used in industrial control and communication field. The connection between data terminal equipment and data communication equipment are strictly dependent on this standard. When the distance is relatively close (less than 20 meters), two