| 摘要 |
<p>The alarm system has a central station Ä1Ü that has a receiver and a transmitter Ä11Ü. The receiver is coupled by non contact communication paths to a variety of sensors and detectors, e.g. motion detectors Ä21Ü, contact detectors Ä20Ü, smoke detectors Ä22Ü, temperature and water sensors Ä23Ü. In addition the system has a manual transmitter Ä5Ü, a remote controller Ä8Ü and a code transmitter Ä8Ü. The system also has a universal receivers Ä710, 70Ü for optical and acoustic information. To check the against disturbances the system has a transponder for test signals. Protection against disturbing noise signals is enhanced by the use of two communication signals of different frequencies and the use of a deactivation phase.</p> |
