| 摘要 |
PURPOSE: A door lock control system is provided to make a visitor enter easily based on a simple configuration. CONSTITUTION: According to the door lock control system, a door apparatus(300) is installed at an entrance gateway and comprises a lock device locking the gateway or releasing the lock of the gateway. A key phone system(100) performs telephone calling connection between a number of key phone telephones(120) and ordinary telephones(130) and indoor terminals including a door phone(140), or exchange system to operate calling connections with the indoor terminals through a central office line. A ring detection door lock control apparatus(200) detects a ring signal provided to the door phone and provides a lock release operation signal of the lock device to the door apparatus when the ring signal is detected.
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