| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an intercom system allowing a visitor to have an automatic door unlocked through a housing information board, and when the visitor enters a multiple dwelling house, allowing a control room to obtain a house number of a dwelling unit called from a collective entrance unit. <P>SOLUTION: An intercom system comprises: a control room master unit provided with entrance history storage means for storing a predetermined house number when the predetermined house number is specified through a collective entrance unit to output a calling signal, and in response to the calling signal, an unlocking signal is outputted from a house information board; and the house information boards each provided with a timer for starting after the unlocking signal is outputted, and stopping when an entrance slave unit is operated and a calling signal from the entrance slave unit is received. <P>COPYRIGHT: (C)2013,JPO&INPIT |
