该系统的***处理器基本配置要求:CPU PⅢ、内存128M、硬盘40G、显存8M,可采用研华的工控机,安装Windows2000操作系统,采用12寸TFT高清晰真彩平板显示器,同时留两个USB接口,一个网口,一个并行接口。
回路通讯卡的功能是向下管理32个回路板,完成对每个回路板的状态扫描(正常、火警、故障、联动),向上实现与工控机间的双向数据交换。与工控机之间采用RS232通讯,与回路板间采用RS485通讯。
外设通讯卡的功能是向下管理系统配用的音响板、继电器卡、手动控制盘、楼层复示器,除音响板为1块必备外,其余为选件,其中***多配继电器卡16块,手动控制盘16块,楼层复示器64台,二者之间采用RS485通讯方式;向上完成与工控机间的双向数据传输,二者采用RS232通讯方式。
回路板的作用是完成与本回路相连的所有探测器、模块的数据采集,并做初步的数据处理,同时接受来自***处理器的控制输出命令,发往现场各模块。每块回路板上可接普通编址单元128只,或智能编址单元198只。
工控计算机的软件采用Microsoft公司的可视化程序语言Visual Basic编制。主要完成对来自下位机的各种采样数据的处理、判断,监控系统运行状态,响应用户的各种操作指令。程序在结构上可分成以下几个模块:
这三种板卡均采用MCS251汇编语言编程,板间通讯的RS485波特率置为4800bps。汇编语言可以更好的解决实时性、准确性问题,从而满足国标GB16806-1997关于***报警时间的要求。为了提高报警的可靠性,软件采用了CRC校验、智能算法、多重判断等措施。
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