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。

youdao

A special locking system means the door cannot be opened accidentally.

特殊的锁定系统使门不会被意外打开。

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The system makes use of the special concentric dual cylinder to lift and drop the wind tunnel door with the aid of synchronization and hydraulic locking technologies.

该液压系统采用特殊同心双缸来升降风洞顶门，并采用同步技术和液压锁闭技术来实现风洞顶门的升降。

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"So it's closing the door on innovation by locking in a national,uniform bureaucratic system.

VOA: special.2011.06.09