The elevator control gateway is a device between the building intercom system and the elevator control system. There are 5 modes defined in the elevator control system: (1) The owner calls the elevator to go up. (2) The owner calls the elevator to go down. (3) The owner enables the apartment in which he resides for visits. (4) The owner opens the door when he receives a doorbell call. (5) Asks the status of the elevator and displays it on the screen. This device has 6 LEDs on the cover. It can display the command information and the STATUS + HOME OWNER'S APARTMENT. 12VDC power. Dimensions: 145 x 90 x 45 mm.