| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide an intercom system which reliably detects abnormality due to unauthorized unlocking, and prevents an erroneous detection when a resident attempts unlocking by a mechanical key. <P>SOLUTION: A non-contact key reader 21 obtains a key code when an operating mode of an intercom master 1 arranged in a house is a warning mode, and a checking part 23 checks it up with the key code registered previously and outputs a checking result as invalid to the intercom master 1. Thereafter, when an electric lock 22 is unlocked and an electric lock control part 24 outputs an unlocking signal to the intercom master, the operating mode of the intercom master 1 is temporarily switched to a release mode, and an abnormality detecting sensor 4 does not perform abnormality detection. Thereafter, when a given time elapses without operating a mode setting part 17, the operating mode of the intercom master 1 is again switched to the warning mode, and abnormality detecting sensors 4 and 5 perform abnormality detection. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
