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    • 2. 发明授权
    • Method and apparatus for networked access control
    • 网络访问控制的方法和装置
    • US6157952A
    • 2000-12-05
    • US914945
    • 1997-08-20
    • Kenneth J. GeiszlerMark W. LeeRobert D. Kohler
    • Kenneth J. GeiszlerMark W. LeeRobert D. Kohler
    • H04L12/403H04L29/12G06F1/26
    • H04L29/12254H04L61/2038H04L12/403
    • An access control device controller and method of operation are provided which provide in a first aspect of the invention, a novel way in which to set controller network addresses providing a visually perceivable digital readout to assist installers in setting the correct address, in a second aspect of the invention, automatic configuration of end of line termination resistors, line biasing resistors and earth ground connection to the network medium shield, in a third aspect of the invention, automatic configuration of a controller/host computer data communications link, in a fourth aspect of the invention, a novel method and apparatus for monitoring ambient RF noise levels, and in a fifth aspect of the invention, a novel method of detecting environmental conditions likely to lead to a system failure.
    • 提供了一种访问控制设备控制器和操作方法,其在本发明的第一方面提供了一种新颖的方式,其中在第二方面中设置控制器网络地址以提供视觉上可感知的数字读出以辅助安装者设置正确的地址 在本发明的第三方面中,在第四方面中,控制器/主计算机数据通信链路的自动配置,本发明的自动配置,线路端接电阻器的线路偏置电阻器和接地连接到网络介质屏蔽 本发明的一种用于监测环境RF噪声水平的新颖的方法和装置,在本发明的第五方面,一种检测可能导致系统故障的环境条件的新方法。