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    • 1. 发明授权
    • Elevator communications bus analyzer
    • 电梯通讯总线分析仪
    • US5294921A
    • 1994-03-15
    • US790044
    • 1991-11-12
    • Charles E. HotkaRobert D. Moore
    • Charles E. HotkaRobert D. Moore
    • H04L12/26G05B23/02
    • H04L43/00H04L12/26
    • A method for allowing access to data frames on an elevator communications bus includes (a) disconnecting a remote station 117 from the communication bus 24; (b) connecting the elevator communications bus 24 to the elevator communications bus analyzer 100; (c) providing the power, return, clock, and data signals on lines 46a, 46b, 48a, 48b from the elevator communications bus analyzer 100 to the remote station 117 previously disconnected; (d) connecting receive or transmit trigger lines 120, 122 from the elevator communications bus analyzer 100 to an oscilloscope 24; (e) selecting an address of a remote station; (f) connecting clock and data signals on lines 46a, 46b to the oscilloscope 124; and (g) switching the oscilloscope 124 to its differential mode to provide on an oscilloscope screen the difference between the clock and data signals (the signal on line 46b minus the signal on line 46a) for the address so that an elevator mechanic may see the data bits on the elevator communications bus.
    • 允许访问电梯通信总线上的数据帧的方法包括:(a)将远程站117与通信总线24断开; (b)将电梯通信总线24连接到电梯通信总线分析器100; (c)将线路46a,46b,48a,48b上的电源,返回,时钟和数据信号从电梯通信总线分析器100提供给先前断开的远程站117; (d)将接收或发送触发线路120,122从电梯通信总线分析器100连接到示波器24; (e)选择远程站的地址; (f)将线路46a,46b上的时钟和数据信号连接到示波器124; 和(g)将示波器124切换到差分模式,以在示波器屏幕上提供用于地址的时钟和数据信号(线路46b上的信号减去线路46a上的信号)之间的差异,使得电梯机修员可以看到 电梯通信总线上的数据位。