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    • 9. 发明授权
    • System for controlling communication between a main control assembly and
programmable terminal units
    • 用于控制主控制组件和可编程终端单元之间的通信的系统
    • US4639889A
    • 1987-01-27
    • US651639
    • 1984-09-17
    • Hiromichi MatsumotoRitsuo Hashimoto
    • Hiromichi MatsumotoRitsuo Hashimoto
    • G06F11/00G06F13/22G06F13/42G06F15/16G06F11/06
    • G06F11/0757G06F13/22G06F13/4226
    • A data communication system comprises a plurality of terminal units having different addresses individually and a main control assembly connected to the terminal units by transmission lines for controlling the terminal units. The terminal units include a first group of terminal units and second group of terminal units. The main control assembly controls the first group of terminal units according to a series of instructions for controlling the units in a predetermined sequence. When executing one instruction, the main control assembly performs data communication with only the one specific terminal unit relevant to the instruction. Concomitantly with the communication with the specific terminal unit, the main control assembly scans and communicates with the second group of terminal units only during periods that specified conditions exist. In addition, means are provided for communicating malfunction information between the main control assembly and the terminal units.
    • 数据通信系统包括分别具有不同地址的多个终端单元和通过用于控制终端单元的传输线连接到终端单元的主控制组件。 终端单元包括第一组终端单元和第二组终端单元。 主控制组件根据用于以预定顺序控制单元的一系列指令来控制第一组终端单元。 当执行一个指令时,主控制组件仅与指令相关的一个特定终端单元执行数据通信。 伴随着与特定终端单元的通信,主控制组件仅在指定条件存在的时段期间扫描并与第二组终端单元通信。 此外,提供用于在主控制组件和终端单元之间传送故障信息的装置。