Elevator 18
Elevator 18 : Controlling Elevators: (h) Some elevators may have one or more of the following: (a) An elevator telephone, which can be used (in addition to the alarm) by a trapped passenger to call for help. (b) Hold button: This button delays the door closing timer, useful for loading freight and hospital beds. (c) Call cancellation: A destination floor may be deselected by double clicking. (d) Access restriction by key switches, RFID reader, code keypad, hotel room card, etc. . (e) One or more additional sets of doors that can serve different floor plans. For example, in an elevated crosswalk setup, the front doors may open on the street level, and the rear doors open on the crosswalk level. (f) Security camera; (g) Plain walls or mirrored walls giving the illusion of larger area; (h) Glass windowpane providing a view of the building interior or onto the streets. Other controls, which are generally inaccessible to the public (either because they are key switches, or because they are kept behind a locked panel), include: (a) Fireman's service, phase II key switch; (b) Switch to enable or disable the elevator; (c) An inspector's switch, which places the elevator in inspection mode (this may be situated on top of the elevator); (d) Manual up/down controls for elevator technicians, to be used in inspection mode, for example; (e) An independent service/exclusive mode (also known as "Car Preference"), which will prevent the car from answering to hall calls and only arrive at floors selected via the panel. The door should stay open while parked on a floor. This mode may be used for temporarily transporting goods. (a) Attendant service mode. (b) Large buildings with multiple elevators of this type also had an elevator dispatcher stationed in the lobby to direct passengers and to signal the operator to leave with the use of a mechanical "cricket" noisemaker
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