可视对讲门口机 Video intercom door machine ; Video Intercom Door Phone
门口机查询 Lobby Inquiry
门口对讲机 door-phone ; door-telephone
闭路电视门口对讲机 closed-circuit television door-telephone
喷雾阀门轧口机 spray valve rolling-installing machine
港口门座起重机 The harbour portal crane ; harbor portal crane
机房门口 Entrance of the equipment room
该文介绍了一种基于单片机AT89S51的可视对讲系统，分析了门口机、室内机、管理机的原理和功能。
Visual-speaking system based on AT89S51 is introduced in this paper. The structure and function of entrance machine, resident machine and supervisor are analysed.
文中给出了系统中各个硬件模块相应的软件设计，详细论述了管理机、门口机以及住户分机对应的软件流程策划方案。
In the article, it gives the software design of each hardware module in the system, and narrates the software flow plan of supervisor, entrance machine and resident machine in detail.
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