摘要
多微机控制系统中各机相距较远时 ,相互之间的通信一般采用串行通信。简要分析了两种串行通信标准 :RS— 2 32C和RS— 4 2 2 /4 85 ;简单比较了RS— 2 32C和RS— 4 2 2 /4 85应用于计算机通信系统时的优缺点 :传输距离、抗干扰能力以及电平偏移等 ;利用Motorola公司的MC34 87和MC34 86实现了RS— 2 32C与RS— 4 2 2 /4 85之间的电平转换 ,实现了一台PC机与多台 80 98单片机之间的通信 ,并给出了上。
When the distance among computers in the microcomputer control system is far, computers usually communicate with each other by serial communication. RS-232C and RS-422/485, standards of EIA ,are analyzed briefly, and their features, such as transmission distance, ability of anti noise and voltage deviation, are compared in this paper. Using MC3487 and MC3486, which are products of Motorola, we carry out the voltage shift between RS-232C and RS-422/485 and set up a communication system between a PC and some 8098s. The software flows relative to the communication are also shown in this paper.
出处
《山东建筑工程学院学报》
2001年第4期12-15,共4页
Journal of Shandong Institute of Architecture and Engineering
关键词
控制系统
串行通信
电平偏移
抗干扰
control system
serial communication
voltage deviation
anti noise
