| 摘要 |
An unmanned security system for informing emergency through a telephone is provided to keep frozen products of a warehouse safely and to take a quick action in receiving an emergency phone call. In an unmanned security system for informing emergency through telephones(1a-1d), a check switch as an input unit is connected with 8 input signals of a compressor, a condenser fan, an evaporator fan, a door sensor, and other sensors of a compressor control box. As an output unit, various switches and display units connected to an embedded one-chip microcomputer(20) are installed at the outer side of a system body. A buffer and the check switch are connected through plural photo couplers in the one-chip microcomputer. A controller is connected through a DTMF(Dual Tone Multi Frequency) generator and the controller and a DTMF receiver are connected through a voice chip between the one-chip microcomputer and a phone line.
|
