非接触式读卡器的动态库源码，利用串口使上位机与下位机进行通信。-Non-contact reader dynamic library source code, using the serial port to the host computer to communicate with the next crew.

一个用c#写的上位机，可以进行串口通讯，识别标签，进行读写操作(A host computer written in c# can communicate with the serial port, identify the label, and read and write.)