：简述了美国HID公司生产的 PROXCARD型非接触式 )IC卡读卡机的工作原理。详细介绍了以此为读入设备，以 为主芯片设计而成的考勤机。-: Descr iption of the United States produced PROXCARD HID Non-contact) IC card reader works. Described in detail in order to read equipment to main chip design made of attendance