| 摘要 |
PURPOSE:To know the occurrence of abnormality at a specified remote place by sending specified warning sound etc. to a telephone set having preset telephone number when abnormality occurred during absence utilizing an acoustic coupler and a telephone circuit. CONSTITUTION:An automatic transmission controlling section U1 is provided with a sensing device 2, and connected to an acoustic coupler C1. A hand set H1 of a telephone set T1 of transmitting side is inserted to the coupler C1. When a sensing signal from the sensing device 2 is given, the telephone set T1 becomes hook off state to an automatic transmission controlling function of the controlling section U1, and dial tone for calling a telephone set T2 of receiving side having preset specified telephone number through the coupler C1, hand set H1, telephone set T1 and a repeater station K. When the receiver of the telephone set T2 is taken up, the dial tone is heard as it is or specified warning sound or warning generation is heard. |
