PCI422COMM控件分为三个层次：驱动层、功能层、接口层。 驱动层：控件所有实质性的操作最终都要归结为PCI口上对某个I/O口的读写，也就是驱动层所完成的事情，这一层次的功能实现由WinDriver来提供，直接引用Win

Packet : PCI422COMM.rar filelist
PCI422COMM.dcr
PCI422COMM.pas
DLL_PCI422_Interface.pas
Interface_PCI422.pas
PCI422.dll

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