【摘要】 便携式多路开关量信号检测仪可以同时检测多路开关量信号,主要由上位机单板计算机和下位机多路开关量信号检测板卡两部分构成,下位机通过PC104Plus接口与上位机互联并基于PCI协议通信。下位机以DSP为核心处理器,采用基于有限状态机的跳变检测方法进行开关量信号检测,根据有效脉宽的设置进行去抖动处理,并利用跳变时间记录开关量信号。上位机应用程序可以采用主动和被动两种方式获取下位机检测的开关量信号状态信息,跳变计时精度达到20μs.更多还原

【Abstract】 A portable instrument was composed of a single board computer and a multiple signal detecting boards which can measure multi-channel switching signals real-timely. The signal detecting boards were connected with the single board computer by PC104 Plus bus connectors,and communicated with each other by PCI protocol. A novel method based on FSM was programed in TMS320VC5416 DSP which can measure the multi-channel switching signals and filter off the dither signal by setting the threshold of pulse width. The application in the single board computer can read the status vs. time of the multi-channel switching signals from the signal detecting boards by active and passive methods,and it’s precision is up to 20 μs.更多还原