该模块在该系统中起着承上启下的作用,实现了TCP/IP协议栈,完成把485线上串行传送的HTTP包数据转化为在交换式以太网中的以太网帧,真正向Web服务器发出HTTP请求.
网络模块转化后的HTTP请求最终到达Web服务器,可用任何服务器端动态网页技术实现数据的处理和保存,实验方案采用微软最新的动态网页技术 ASP.Net.通过编写程序获取有效数据,转化为原始二进制数据形式,验证校验码,如果无误根据数据的对应写入实时数据库,如果实时性要求不高以及数据存储量不大,可以使用ACCESS数据库,不然可以使用专用的数据库服务器,如Oracle和SQL Server.
(1)可以很方便的集成现有设备和仪表的数据采集.只要知道仪表设备的通讯协议,在下位机实现数据通讯,把采集到的数据封装为HTTP协议包通过串口发出即可.
(2)采用工业交换以太网,基于HTTP协议,同时满足局域和远程采集的需要.可以把该系统连至 Internet,Web Server And Real Database和采集系统不在同一地理位置,而且服务器可以同时处理多个不同地理位置的数据,方便实现数据集中,能更好的管理和使用数据.
(3)方便维护和升级,方便增加采样点.可以根据需要随意增加下位机,做到需要几个模块调试增加几个模块.
(4)不同于传统的专用采集服务器采集数据模式,上位机服务器的功能由Web服务提供,不需要编写专门的数据接收程序和采集程序,只要编写完成数据的处理和保存的代码.真正同仪表的通讯由下位机完成,形成分布式数据采集,Web服务是多线程体系结构,可并发处理多个下位机模块发送的数据,使得整个系统支持更多的数据点采集,提高整个系统的采集效率.
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