| 摘要 |
PURPOSE:To know the accurate position of the terminal unit by making the signal generating means corresponding to the set-up of the address memory double the signal generating means which informs the response of the fault sensor means and then securing the talking enable state after generation of the signals. CONSTITUTION:When start switch 1 provided at the terminal device is closed, 2nd start register 4 is set. And control circuit 5 is started by the output of register 4. Furthermore, automatic dial 6 is started by the output of circuit 5 to call out the sensor device by the telephone number of address memory 9 which is set previously. And circuit 6 is connected to office terminal L0 via switch circuit 7. At the same time, the call signal obtained via switch circuit 21 is applied to incoming circuit 22 at the sensor device, and circuit 22 starts answer circuit 25. Furthermore, signal sending circuit 24 is started to give the answering state to the circuit, and the output is sent to the terminal unit via switch circuits 25 and 21. The terminal unit applies the signal to signal sending circuit 10 via circuit 7 and hybrid circuit 8 and then to circuit 5. Thus the position of the terminal unit can be known accurately. |
