实验室门禁管理系统由门控制器、区控制器、中央控制器及上层软件组成。
This laboratory management system of entrance guard is composed of door controller, area controller, central controller and upper software.
所有大门控制器不断连接中央服务器，并且任何的离线控制器会通过电子邮件提醒管理员。
All door controllers are in continual contact with the central server, and any offline controller alerts the manager via email.
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