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重点论文网    工科论文    电子信息论文    RS-232至RS-485/RS-422接口的智能转换器
创建时间:04-07

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  

课题的主要内容及要求
此课题进行的智能转换器设计包括两部份,即硬件设计和软件设计,其中硬件设计分4个部份:DC-DC转换器、RS-232接口、RS-485/RS-422接口和微处理器。软件设计分二个方面:一是微处理器和接口的初始状态设置,二是控制程序设计;具体要求是解决两个关键问题,即如何从RS-232线上获得电源和RS-485/RS-422接口驱动所需的功率及如何智能控制RS-485/RS-422的收发功能。同时涉及RS-232线上取电、RS-485/RS-422接口发送和接收状态的智能切换、通信方式设置、RS-232电平与RS-485/RS-422电平之间的转换等方面。基本要求是从RS-232信号线上高效率地产生电源;实现RS-232接口与RS-485/RS-422接口的智能转换。 
 

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