| 摘要 |
PURPOSE:To precess a failure signal of slave stations surely without providing a vacant line time, by preventing crosstalk with the polling system performing a call repetitively at a prescribed interval from a master to the slave stations. CONSTITUTION:A failure produced in a station to be monitord (slave station) is transmsitted to a monitoring station (master station) with priority by using the polling system by means of a radio wave. In this case, the master station has a radio device 1 having a transmitter TX and a receiver RX, and a call controlling section 2 can perform a call at a prescribed interval to the slave stations other than a prescribed time or an arbitrary call, and a failure signal inputted via the RX is detected at a failure dicriminator 3. On the other hand, the slave stations have a radio device 4 provided with a transmisser TX and a receiver RX. In detecting a failure signal inputted from an input section 5, a failure memory 6 storing the failure signal is set and the signal is transmitted to the master station as the status signal from an input device 7. |
