| 摘要 |
PURPOSE:To simultaneously perform presence/absence display and call in many places by providing each display operator with a call switch, a response switch, and a buzzer and not only sounding the buzzer of each display operator but also changing a name display part to the calling state by the call switch. CONSTITUTION:Plural display operators 3 are connected to a controller 1 through a private transmission line 2. When the call switch SWa of the display operator 3 is turned on and an operation part 5 corresponding to a name display part 4 of a person to be called is operated, the call is displayed on the name display part 4 of this person on each display operator 3 and a buzzer B is sounded by the controller 1. When the called person operates a response switch SWb on the display operator 3 and the operation part 5 corresponding to the name display part 4 where the call is displayed, the call display on the pertinent name display part 4 on each display operator 3 is erased and the sounding of the buzzer is stopped. |
