| 摘要 |
PURPOSE:To disuse the initiative of a follower monitor control station to eliminate a conflict state for a system which monitors plural control stations to be monitored by main and follower monitor control stations, by transmitting a start code from the main monitor control station when the fault of a signal transmitting circuit is recovered. CONSTITUTION:When a signal transmitting circuit has a fault, the initiative which is so far possessed by a main monitor control station 1 for transmission of call signals to control stations 2-4 to be monitored and reception of answer signals is transferred to a follower monitor control station 5 for stations 3 and 4. Then the station 1 possesses the initiative only to the station 2. When the fault of the signal transmitting circuit is recovered, a start signal 16 showing the initiation of an interrogation period is transmitted to the station 5 from the station 1. Then call signals 10, 12 and 14 are transmitted and received together with answer signals 11, 13 and 15. The station 5 discontinues the transmission of call signals from own station immediately after the signal 16 is detected and disuses its initiative. Thereafter only the station 1 possesses the initiative. |
