Event Flow Description
- E1: The Elevator Button Request arrives at the Elevator Button Interface object.
- E2: The Elevator Button Interface object sends the Elevator Request to the Elevator Manager object.
- E3: The Elevator Manager sends the request to Elevator Status & Plan, which adds the request to the list of floors to be visited.
- E4: The elevator plan is updated. An acknowledgement is returned to the Elevator Manager object, which identifies whether the elevator is idle.