| 摘要 |
The answerphone has a number of switches fitted into its power supply line, so that one of several sensors can detect a fault and change a switch to change the answerphone behavior. The system uses a telephone answerphone with a recording facility, and/or a transmitter as a means of detecting a fault at a monitored location, and transmitting a warning signal to a remote location. The answerphone (RE) and/or the control relay (REL) of the transmitter loop (TR) are supplied with the same electrical supply as the monitored equipment. One or more detectors are used to provide signals indicating the operational status of various monitored items of equipment on the site. These signals are used to control switches which can be activated to cut the supply to the answerphone, thus blocking its ability to send a pre-recorded message.
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