| 摘要 |
An alarm system for recording the occurrence of an alarm condition in a predetermined space comprises a self-contained monitor which defines a sensor armed for sensing the alarm condition and a monitor transmitter which transmits a monitor signal in response thereto. In addition, the system comprises an interface module responsive to the monitor signal which communicates with a telephone line and a telephone answering machine associated with the predetermined space. The interface module includes an interface receiver circuit, a message generator which provides an alarm message, an off-hook telephone circuit, a telephone line simulator and a transfer switch. In response to the monitor signal, the interface receiver circuit operates the transfer switch to an activated position wherein the alarm message is transmitted from the message generator through the off-hook telephone circuit, the telephone line simulator and the transfer switch to the telephone answering machine for recording thereon. Subsequently, the user calls the telephone line to access the answering machine in order to retrieve the alarm message.
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