【摘要】 将单片机技术与U盘存储技术两者结合起来,设计基于射频识别(RFID)技术和U盘存储的抄表系统.系统利用单片机直接读写U盘,通过MAX485接口芯片完成单片机与电力仪表的信息交换,通信协议为标准MODBUS-RTU,主控芯片89C2052完成信息的处理与双向传递.RFID采用的工作频率为433 MHz,以循环冗余校验法校验传输数据,同时采用时分多路(TDMA)来实现射频识别系统的防碰撞.更多还原

【Abstract】 After combining the microcontroller technology and the U disk storage technology,this paper introduces the designing of meter-reading system based on radio frequency tdentification(RFID) technology and U disk storage technology.The reading and writing of the U disk is controlled through microcontroller,the information exchange between the microcontroller and the electrical meters are carried out through MAX 485 interfacing chip,and the standard MODBUS-RTU protocol is used for the communication.89C2052 is used as the MCU of the system,and it is used for data processing and bi-directional transmission.The working frequency of the RFID is set as 433 MHz,and cyclic redundancy check method is adopted for the data calibration.The anti-collision of the radio frequency Identification system is realized through adoption of the Time Division Multi Access(TDMA) algorithm.更多还原