人机界面生产厂家都会在他们的产品中装载与几种常用PLC通信的驱动程序,并为其它类型的PLC提供了一种通用的自由机型通信协议。本文给出了一种基于此协议开发SAIA PCD (process Control Device)与人机界面MD204L通信的驱动程序编制方法...人机界面生产厂家都会在他们的产品中装载与几种常用PLC通信的驱动程序,并为其它类型的PLC提供了一种通用的自由机型通信协议。本文给出了一种基于此协议开发SAIA PCD (process Control Device)与人机界面MD204L通信的驱动程序编制方法,这种驱动程序可以根据实际需要来编写,灵活性较强,拓宽了系统选型时的选择范围,降低了系统成本。展开更多
This paper analyzes the total movement period of the development of the world telecommunication industry, and points out the basic principles of the supply and demand regulation and the market drive are important and ...This paper analyzes the total movement period of the development of the world telecommunication industry, and points out the basic principles of the supply and demand regulation and the market drive are important and useful to the telecommunication industry. The thesis puts forward the pertinent evaluation and the positive suggestions according to the general characteristics and individual characteristics of Chinese telecommunication industry and emphasizes the meaning of the demand drive.展开更多
文摘人机界面生产厂家都会在他们的产品中装载与几种常用PLC通信的驱动程序,并为其它类型的PLC提供了一种通用的自由机型通信协议。本文给出了一种基于此协议开发SAIA PCD (process Control Device)与人机界面MD204L通信的驱动程序编制方法,这种驱动程序可以根据实际需要来编写,灵活性较强,拓宽了系统选型时的选择范围,降低了系统成本。
文摘This paper analyzes the total movement period of the development of the world telecommunication industry, and points out the basic principles of the supply and demand regulation and the market drive are important and useful to the telecommunication industry. The thesis puts forward the pertinent evaluation and the positive suggestions according to the general characteristics and individual characteristics of Chinese telecommunication industry and emphasizes the meaning of the demand drive.