描述
由于采用了TCP/IP协议以及100M以太网的传输方案,符合国际标准,因此PC端软件系统的开发非常方便,本课题采用了美国NI公司的Labwindows/CVI来开发,它是基于标准C语言的虚拟仪器开发工具,提供了包括按钮、换档开关、示波器等在内的大量人机界面函数一以及包括快速傅立叶变换、均方差计算、数字滤波等在内的信号处理函数,大大简化了开发进程。在CSE808系统中,4510B通信系统板的IP地址为192.168.0198,作为TCP的Server端;主控PC的IP地址为192.168.0.188,作为TCP的Client端。图4显示的是测试得到的I一种CRT显示器的亮度和两个色度信号的瞬态波形。显示器设置的刷新频率是85Hz,CSE808系统的采集速率是通道16位并行20kHz。测试结果是三个通道的刷新频群分别是84.9Hz、85.lHz、85.0Hz,证明系统工作正常。
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