| 摘要 |
PURPOSE:To improve the economy of a radio communication system by sending alarm information to a centralized supervisory station only when a fault takes place in a radio station, and using another line while a line for radio communication is intermitted once to eliminate the need for an alarm sending exclusive line. CONSTITUTION:If a fault takes place in the radio station 1, alarm information 109 is sent from an alarm detection circuit 9 to an alarm information sending circuit 10. The alarm information sent to a centralized station 3 from the circuit 10 is formed and a frequency to a radio frequency switching circuit 15 and an input/output selection switching signal 110a go to the 2nd state. According to the state change of the signal 110a, the circuit 15 inputs a signal 110b from the circuit 10 in place of a signal 107 from an input terminal 7 while the radio frequency 13 is switched into the alarm information sending and confirming signal reception frequency 14. Further, the output destination is switched to a confirming signal reception circuit 11 to receive an information reception confirming signal sent from the centralized supervisory station 3 in place of the signal outputted to an output terminal 8. |
