CPU卡流量计功能要求及实现

Functional Requirements and Implementation of the CPU Card Flow Meter

随着城市燃气用户的快速发展及应用,CPU卡流量计因功能强大、安全性能强的优点在城市燃气应用中越来越广泛,它取代了传统的上门抄表工作,为燃气公司节省了大量的人力、物力。根据CPU卡以及城市燃气的特点,设计了用于城市燃气的CPU卡文件结构以及密钥管理体系,实现了CPU卡流量计的计量及预付费功能。

Along with the rapid development of gas users in cities and applications of gases,CPU card flow meter has been used wider and wider in civic applications because of its advantages of powerful functions and high security.It replaces traditional door-to-door manual meter reading job,so saves a lot of manpower and material resources for gas companies.According to the characteristics of CPU card and civic gas,the file structure and dongle management architecture of the CPU card are designed,and the CPU card metering and pre-payment functions are achieved.