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    • 2. 发明授权
    • Communication control method for releasing communication apparatus from
occupied state
    • 用于将通信装置从被占用状态释放的通信控制方法
    • US5031175A
    • 1991-07-09
    • US407731
    • 1989-09-15
    • Shotaro TanakaMasao IkezakiHiroshi SasanumaYukiko Hase
    • Shotaro TanakaMasao IkezakiHiroshi SasanumaYukiko Hase
    • H04L12/413
    • H04L12/40026
    • A communication control method for use in a communication system including a plurality of communication control apparatuses interconnected through an information transmission path, each of the communication control apparatuses including a packet transmission/reception unit, a timer unit and a controller unit. When a first communication control apparatus has become unable to perform communication due to accidental power-off or a power supply failure or the like in the course of communication with a second communication control apparatus (which has been brought into a locked state by the first communication control apparatus), the invention prevents the second communication control apparatus from being left permanently in the locked state. In that case, the second communication control apparatus transmits a lock confirmation packet to the first communication control apparatus to make lock confirmation as to whether the locked state is to be maintained, when the second communication control apparatus does not receive any communication packet from the first communication control apparatus for a predetermined period of time. When no reply to the lock confirmation is received or alternatively when an unlock authorization packet is received by the second communication control apparatus, the second communication control apparatus releases itself from the locked state.
    • 一种通信控制方法,用于包括通过信息传输路径相互连接的多个通信控制装置的通信系统,每个通信控制装置包括分组发送/接收单元,定时器单元和控制器单元。 当第一通信控制装置在与第二通信控制装置(其已经被第一通信已经被锁定的状态)通信的过程中由于意外断电或电源故障等而变得不能进行通信 控制装置),本发明防止第二通信控制装置永久地处于锁定状态。 在这种情况下,当第二通信控制装置没有从第一通信控制装置接收到任何通信分组时,第二通信控制装置向第一通信控制装置发送锁定确认分组,以确定是否保持锁定状态的锁定确认 通信控制装置。 当不接收到锁定确认的应答时,或者当第二通信控制装置接收到解锁授权分组时,第二通信控制装置将其自身从锁定状态释放。
    • 5. 发明授权
    • Communication system comprising a communication line monitor for
monitoring a communication line
    • 通信系统包括用于监控通信线路的通信线路监视器
    • US5166928A
    • 1992-11-24
    • US690697
    • 1991-04-24
    • Shinako NishiokaShotaro TanakaTohru SakonMasao Ikezaki
    • Shinako NishiokaShotaro TanakaTohru SakonMasao Ikezaki
    • H04L12/26
    • H04L43/00H04L12/2602
    • A communication system includes plural terminal apparatuses and a communication line monitor connected to a common a communication line. The monitor transmits to each of the terminal apparatuses a request signal for requesting each of the terminal apparatuses to transmit the data of a correspondence table, showing a relation between packet data and character codes corresponding thereto, when the monitor is initialized, receives the data of the correspondence table from each of the terminal apparatuses, and stores the received data of the correspondence tables in a memory. Thereafter, the monitor receives packet data transmitted through the communication line, coverts the received packet data into corresponding character codes by referring to the data of the correspondence tables stored in the memory, and displays the converted character codes on a display unit.
    • 通信系统包括多个终端装置和连接到公共通信线路的通信线路监视器。 所述监视器向所述终端装置发送请求信号,所述请求信号用于请求每个所述终端装置发送对应表的数据,所述对应表的数据表示分组数据与其对应的字符代码之间的关系,当监视器初始化时,接收数据 来自每个终端设备的对应表,并将对应表的接收数据存储在存储器中。 此后,监视器接收通过通信线路发送的分组数据,通过参照存储在存储器中的对应表的数据将接收到的分组数据覆盖为相应的字符代码,并将转换的字符代码显示在显示单元上。