| 摘要 |
PURPOSE:To avoid stopping of information function because a battery remains unreplaced by using a reset signal from a transmitter side to reset an alarm circuit and designing the circuit that said reset signal is not generated until a power battery is not replaced. CONSTITUTION:When a switch 22 is closed after a power battery 26 of a transmitter 20 is replaced into a new battery logical levels of input terminals (b), (a), (d) of an encoder 25 go respectively to '0', '1', '1'. Thus, signals '01', '11' are outputted alternately from an output terminal (c) of the encoder 25. Then signals '01', '11' are inputted alternately to an input terminal c' of a decoder 37 at the receiver 30. A signal '1' is outputted alternately from output terminals a', d' of the decoder 37 attended therewith. As a result, an informing device main body 40 applies similar alarm display at operation of a sensor 10, an alarm generating circuit 39 is reset to stop a battery wear alarm. That is, the battery 26 is replaced into a new one and so long as the switch 22 is not closed, the alarming operation of the circuit 39 is not stopped. |
