公开(公告)号：US4755929A

公开(公告)日：1988-07-05

申请号：US656024

申请日：1984-09-28

申请人： Ronald W. Outous ,  Eugene P. McGuire

发明人： Ronald W. Outous ,  Eugene P. McGuire

IPC分类号： G06F1/035 ,  G06F11/00 ,  G06F11/32 ,  G08C15/00 ,  G06F5/00

CPC分类号： G06F1/0356 ,  G06F11/328 ,  G08C15/00 ,  G06F11/006 ,  Y10S707/99931 ,  Y10S707/99945

摘要： Apparatus and methods for retrieving bipolar, standardized, digital communication words for test purposes from a source transmitting over a system bus, and displaying these communication words in an understandable format. The apparatus incluldes signal receiving ports coupled to the desired bus, which monitor and retrieve preselected communication words that are transmitted to one or more line replaceable units connected to that bus. Each incoming communication word contains an encoded label which is repetitively compared to a preselected label so that only those communication words having matched labels are retrieved for display. The retrieved word is decoded in either engineering or binary form and then displayed at an LCD window, printed out as hard copy, or made available to an IEEE-488 interface. Since the same label may be used to identify different communication words depending upon the transmitting source and bus, the apparatus includes an internal data base which utilizes the label and a transmitter identification code to generate data defining the selected communication word in proper engineering units and units of measure regardless of the system bus accessed. The apparatus includes signal input conditioning circuitry including two parallel comparators to convert the incoming bipolar signals into unipolar, NRZ data, data clock sync and gap signals used in downstream digital circuitry.

摘要翻译： 用于通过系统总线发送的源检索用于测试目的的双极，标准化数字通信字以及以可理解的格式显示这些通信字的装置和方法。 该装置包括耦合到期望总线的信号接收端口，该信号接收端口监视和检索发送到连接到该总线的一个或多个线路可更换单元的预选通信字。 每个传入通信字包含与预选标签重复比较的编码标签，以便仅检索具有匹配标签的通信字用于显示。 检索到的单词以工程或二进制形式进行解码，然后显示在LCD窗口，作为硬拷贝打印，或者可用于IEEE-488接口。 由于可以使用相同的标签来根据发送源和总线来识别不同的通信字，所以该装置包括利用标签的内部数据库和发射机识别码以适当的工程单位和单位产生定义所选择的通信字的数据 无论系统总线访问。 该装置包括信号输入调节电路，其包括两个并联比较器，用于将输入双极性信号转换为单极性NRZ数据，数据时钟同步和下行数字电路中使用的间隙信号。