AS 1735.1:2016 Australian Standard Lifts, escalators and moving walks
6.150 Operation, group collective (passenger or dual control)
Operation of two or more lifts coordinated by a supervisory control system, including automatic dispatching means whereby selected cars at designated dispatching points automatically close their doors and proceed on their trips in a regulated manner.
NOTE: A group collective operation includes one button in each car for each floor served and up and down buttons at each landing (single buttons at terminal landings). The stops set up by the momentary actuation of the car buttons are made automatically in succession as a car reaches the corresponding landings, irrespective of its direction of travel or the sequence in which the buttons are actuated. The stops set up by the momentary actuation of the landing buttons may be accomplished by any lift in the group and are made automatically by the first available car that approaches the landing in the corresponding direction.
6.151 Operation, independent (or exclusive)
A car operational feature made effective by one (or more) key switch, a security card, or a tag key, which provides for operation of a lift only by controls within the car.
NOTE: Independent operation is intended for hospital goods, express service, cleaning service and the like. The inspection service control and the fire service control each override any independent operation.
6.155 Operation, signal (attendant controlled)
A method of control by which, although the lift car is started by an attendant, the stops are determined and registered by the pressure of buttons at the lift landings or by pressure of other buttons in the lift car, or with a battery of lifts, the signals made by the pressure of ‘up and down’ landing buttons are answered by the first available lift car travelling in the appropriate direction.
6.156 Operation, single automatic (passenger controlled)
Automatic operation by means of one button in the car for each landing level served and one button at each landing, arranged so that if any car or landing button has been actuated, the actuation of any other car or landing operating button will have no effect on the operation of the car until the response to the first button has been completed.