摘要
采用SPP设计的数据采集系统无法运行具有安全机制的W indows XP等系统。而采用笔记本计算机增强型并口EPP结合MAX197AD芯片设计硬件,并用VC++6.0和W inIo库进行软件设计,则适合于W indows XP系统。介绍了EPP的数据采集硬件电路和EPP的电气特性,即能够双向传递数据且传输率接近ISA总线。采集软件使用虚拟设备驱动技术,实现了W indows XP安全模式下对并口的访问,具有很强的适用性。
It is unable to run Windows XP offering security mechanism on data acquisition systems designed with standard parallel port. While designing hardwareware by using notebook co,nputer enhanced parallel port （EPP） and MAX197 AD chip and software by VC ＋＋ 6, 0 and WinIo library, the system is suitable for Windows XP. The EPP data acquisition hardware and EPP electric characteristics are introduced,that is, the data can be transferred to dual direction and the transmission rate is similar to that of ISA bus. The parallel port access is implemented under Windows XP security ,nechanis,n by using virtual device driving technology for acquisition software. This features powerful applicability.
出处
《自动化仪表》
CAS
2006年第2期36-39,共4页
Process Automation Instrumentation
