| 摘要 |
<p>PURPOSE:To facilitate the correspondence of a management station by devising the system such that all stations receiving system state management information from the management station give a reply to the management station. CONSTITUTION:The system state management information is updated at the management station 1 and sends the result to all stations. The station 1 keeps reception of a reply from stations 2 and sends the information again to a station returning no reply at a point of a prescribed time after the transmission. The station waits for a reply for a prescribed time. When no reply comes regardless of repetition of retransmission for a prescribed number of times, the station 1 regards the station as a faulty station to revise the system state management information and sends the result to all the stations. When a reply comes during retransmission, it is regarded that the management information is sent to all the stations and succeeding change information is awaited. Through the constitution above, the state resulting in system-down such as dissidence of system state among the stations is avoided and the circuit network system with high reliability is realized.</p> |
