The lobby interphone and uses this the supervisory telephone call system null for the multiple dwelling house

摘要

PURPOSE:To allow even the 3rd party to easily unlock a locked switch door by allowing the opening of the door based on a control signal to an unlocked switch door control means on the occurrence of a fault. CONSTITUTION:When no fault takes place in a lobby interphone 1, an electromagnetic lock control means 11a of an unlocked switch door control means 11 drives an electronic lock 11b to prevent an unlocked switch door 1a from being opened. Thus, an unlock switch 10 cannot be controlled. On the other hand, when an abnormality such as a fire takes place, a control signal is sent to the electromagnetic lock control means 11a from an alarm monitor panel (not shown) to release the drive of the electromagnetic lock 11b. Thus, the opening of the unlock switch door 1a is allowed and when the unlock switch 10 is operated by opening the unlock switch door 1a, even a 3rd party unlock the common gatedoor.