CALL SYSTEM FOR MULTIPLE DWELLING HOUSE

摘要

PURPOSE:To start initial operation securely by transmitting an initial request signal to a main centralized calling device when the cold start of only a slave centralized calling device is made for the main centralized calling device which calls house terminal devices of all specific addresses. CONSTITUTION:When the system is actuated by a cold start, logical circuits 18 and 19 of a warning monitor board 1 send in initial start signal through a power line together with address data of a lobby operating device 3. The logical circuit parts 18 and 19 of the warning monitor board 1 send an off signal for turning off the built-in relay of the connection control part 31 of each house terminal device 2 and then disconnecting the interphone 38 in address order together with address data. The house terminal device 2 when called receives the off control signal to make the disconnection and returns an answer-back signal. The warning monitor board 1 registers the address of the house terminal device in a memory in response to the answer-back signal.