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Types and functional characteristics of smart IC card cold water meter；
IC card cold water meter (IC card water meter for short) is a kind of water meter with a prepayment function, which is based on the cold water meter with a signal output device, with an IC card as the medium, equipped with a controller and electric control valve.
1. Type of IC card water meter.
According to the use of cards, there are two representative types:
(1) TM card. TM card is a kind of data exchange card independently developed and produced by a Dallas company with independent intellectual property rights. It has specific shaping and reading and writing devices. Interface and reading and writing devices are not compatible with international standard IC cards, which we often call IC cards. At present, few companies are still using TM cards, but there are some applications in a few industries such as access control systems.
(2) IC card. IC card has three outstanding characteristics, namely international standardization, intelligence, and security. Since 1987, ISO / IEC 7816 has been specially formulated by International Standardization Organization for IC cards. Since then, more than ten companies have invested in the development and production of IC cards, including Motorola, Thomson, Hitachi, Oki, Toshiba, sharp, AIMEL, Philips, Siemens, etc. The IC card application industry has rapidly penetrated into various industries, such as finance, telecommunications, medical treatment, insurance, transportation, etc.
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