控制mg500读卡器进行卡片号码的筛选，可以避免出现购买卡片重号的可能-Mg500 control card reader numbers for screening, avoided re-issue of the purchase card may be

控制mifare读卡器，型号为mg500的源程序，可以延伸出很多智能卡方面的应用-Control mifare reader, model mg500 source, can be extended a lot of smart card applications

利用连接mg500读卡器进行卡片是否完好的检测程序，并且进行卡片数量的计数-Mg500 is linked with the card reader to carry out the testing process is intact, and the number of cards to count