According to the BACnet protocol documentation:

Defines a standardized object whose properties represent the externally visible characteristics of a lift. As there could be multiple car doors on a lift car, there could also be up to the same number of landing doors for the lift car at each floor. Normally, a landing door is driven by the car door as landing doors are not powered. So the status of a lift car door also reflects the status of the corresponding landing door at a particular floor.

Objects of type lift have the following properties:

•ackedTransitions

•assignedLandingCalls

•carAssignedDirection

•carDoorCommand

•carDoorStatus

•carDoorText

•carDoorZone

•carDriveStatus

•carLoad

•carLoadUnits

•carMode

•carMovingDirection

•carPosition

•description

•elevatorGroup

•energyMeter

•energyMeterRef

•eventAlgorithmInhibit

•eventAlgorithmInhibitRef

•eventDetectionEnable

•eventEnable

•eventMessageTexts

•eventMessageTextsConfig

•eventState

•eventTimeStamps

•faultSignals

•floorText

•groupId

•higherDeck

•installationId

•landingDoorStatus

•lowerDeck

•makingCarCall

•nextStoppingFloor

•notificationClass

•notifyType

•objectIdentifier

•objectName

•objectType

•outOfService

•passengerAlarm

•profileLocation

•profileName

•propertyList

•registeredCarCall

•reliability

•reliabilityEvaluationInhibit

•statusFlags

•tags

•timeDelay

•timeDelayNormal