接口的智能转换器 二

文档字数:14931,页数:30  附任务书，开题报告，文献综述

RS-232至RS-485/RS-422接口的智能转换器
 
 摘要：随着计算机在工业的广泛应用，现行的诸多控制系统，采用单机控制方式已越来越难以满足设备控制的要求，基于此种情况，具有多节点功能的RS-485/ RS-422接口芯片已广泛应用于工业控制、仪器、仪表、多媒体网络、机电一体化产品等诸多领域。就目前来说，在解决RS-232和RS-485/RS-422之间的电平转换设计方案上很多，例如适配法等，但大部份存在着通用性差，占用系统资源多，硬件和软件过于复杂，成本高等问题。
 关键词：RS-232，RS-485/422，接口，智能转换器
 
 
    Intellectual Converter from RS-232 to RS-485/RS-422 Interface
 [Abstract] With the wide application of the computer in industry, a good many current control systems have much more difficulty in satisfying the need of controlling equipment to adopt the control method of the unit. Because of the situation, RS-485 interface chip has extensively already applied in industrial control, instrument, network of multimedia and integrated product of electro mechanics, etc. At present, there are a lot of solvable plans of changing level between RS-232 and RS-485/RS-422, for example the adapting method. But the majority of the plans have less common ability, take up too many systematic resources, the hardware and software of them are too complicated, and the cost of them is too high.
    [Key words] RS-232，RS-485/422，Interface，Intellectual converter 
 目录
标题摘要……………………………………………………………………6
总体设计……………………………………………………………………7
  1.1 功能描述…………………………………………………………………7
  1.2 结构框图…………………………………………………………………7
  1.3 工作原理…………………………………………………………………8
硬件设计……………………………………………………………………9
  2.1 DC-DC转换电路…………………………………………………………9
  2.2 RS-232接口…………………………………………………………… 10
  2.3 RS-485/RS-422接口……………………………………………………12
  2.4 微处理器…………………………………………………………………15
软件设计………………………………………………………………24
附录……………………………………………………………………30

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