Introduction to flow meter based on CPU card scale function requirement and design

Abstract: introduction to flow meter based on CPU card scale functional requirements and design scheme of information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. Abstract: IC card is a kind of semiconductor, has been more and more apply to the information automation, namely people's life, but it also has some shortages itself, due to the limitation of logic encryption card technology, supplier of key unable to be applied to the party ( The fuel gas. More flow meter manufacturers choose model price quote you are welcome to inquire, here is mainly based on CPU card flow meter scale function requirement and design the article details. IC card is a kind of semiconductor, has been more and more apply to the information automation, namely people's life, but it also has some shortages itself, due to the limitation of logic encryption card technology, supplier of key unable to be applied to the party ( Gas company) Open, so the application can't grasp the core security, system security depends on the product suppliers, and different types of logic encryption card are incompatible, lead to different vendors chip data storage solution also incompatible, application side in the use of several card table can cause a variety of key management and key algorithm complexity. The article discusses the design of some requirements to everyone. The introduction of IC card is a kind of semiconductor, the microelectronics technology is adopted to improve the information storage, processing. Since its birth in 1970 * IC card, IC card has experienced general memory card, encryption, memory card, CPU card and super smart card four times. IC card is the result of the development of comprehensive multidisciplinary technology, its application has become one of the symbols of a national science and technology development level. IC card application in city gas flow measurement is more and more widely. Before the CPU card flow meter, a large number of USES logic encryption card. Due to the limitation of logic encryption card technology, supplier of key unable to be applied to the party ( Gas company) Open, so the application can't grasp the core security, system security depends on the product suppliers, and different types of logic encryption card are incompatible, lead to different vendors chip data storage solution also incompatible, application side in the use of several card table can cause a variety of key management and key algorithm complexity. CPU card is also called the smart card, built-in CPU card, process capacity and large capacity of data, and add, decryption algorithm coprocessor, computing speed is fast. Using CPU card, and formulate a unified specification, gas company can complete control of the CPU card flow meter core technologies and key algorithms, guarantee the accuracy of the gas metering and realize the first purchase of air, gas or prevent the user from stealing gas. CPU card industry, therefore, is the key to the successful application of the flowmeter is the CPU card key system design perfect. 1, the function of the CPU card flow meter at present, the new type of CPU card flow meter is a measuring base tables, electronic flow meter and control valve, which integrates the meter. Previously, the CPU card flow meter is usually integrators will flow meter and the IC card control valve through the electrical connections, flow meter in measuring a certain amount of ( Usually for 1 m3) Output a pulse to IC card control valve, IC card control valve for deductions, when deduction more than allow overdraft amount, control valve to close. In this way, the reliability of the electrical connection is the key, often deductions are not synchronized, the quantity of flow meter run with IC card control valve to deduct the amount of different, causing metering disputes. So, tell from the CPU card flow meter functions, the integration of flowmeter is development trend. Fuel gas trade, the user through the CPU card after buy top-up to the flowmeter, the fuel gas company by CPU card to manage users, the purpose of CPU card plays a key role of users and the gas company. In addition, when the upstream gas price floating, gas company timely adjusting gas price by CPU card or by other means. To sum up, the CPU card should be kept for at least the following information: the user information, gas company logo, purchase volume and the number of buy gas, as well as the security needs and design of key group, different function card card marks. In order to avoid abnormal operation cause data loss inside card, you can also record in Calvin a major operation, abnormal card again after operation can continue normal operation.

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