| 摘要 |
PROBLEM TO BE SOLVED: To immediately light an answering lamp at the serviceable time to improve reliability of service by constituting this system out of a plurality of sub-controllers controlling lighting of answering lamps based on existence of serviceability, and a main controller and correspondence lines in series supplying changed information against the existence to the respective sub-controllers. SOLUTION: When a call button is pushed, the serviceability deciding parts of respective sub-controllers judge existence of serviceability based on stored information data, and output lighting command signals to light answering lamps. Meanwhile, when a main controller MC receives the call signal from the respective sub-controllers, it generates an answering lamp control signal based on an information signal concerning existence of serviceability from an operation control part 1, and transmits it to the respective sub-controllers. A serviceable information signal generating part 2 transmits changed information of existence of serviceability against the existence to the respective sub-controllers through correspondence lines in series. At this time, for insuring reliability of correspondence, it is repeatedly transmitted. |
