接触式IC卡的一种，西门子4442。
This paper introduces the working principle of logic encryption card SLE4442 and its concrete application at spirometer, and also the design of a general IC card interface circuit.
文章介绍了逻辑加密卡sle4442工作原理及其在肺活量计上的具体应用过程，并设计了一种通用的IC卡接口电路。
This paper introduces the architecture and design principles of a door locking system using IC card, taking SLE4442 as an example. It explains particularly the realization of communication.
本文以SL E44 42型IC卡为例，介绍宾馆IC卡门锁系统的组成及设计原理，并着重讲解了通讯的实现。
The characteristics and the functions of SLE4442 intelligence card produced by SIEMENS Co. and its applications in the intelligence water meter and the charge management system is described.
介绍了SIEMENS公司生产的SLE4442卡的特征、功能及在智能水表及其收费管理系统中的应用。
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