This system is operated by the switches installed on the operating panel at each floor. Once this system starts moving, it continues moving regardless of a call from another floor during operation, and the built-in day circuit enables the system to respond to other calls only after completing the service of the first call

When the dumbwaiter starts moving, the "in use" lamp will turn on, along with the floor button lighting of dumbwaiter.
When the car reaches the destination, the buzzer rings

Installed at each landing door, this switch stops operation of the box when the landing door is opened.