According to the BACnet protocol documentation:

Defines a standardized object whose properties represent the externally visible characteristics of a device that indicates measurements made by counting pulses. This object maintains precise measurement of input count values, accumulated over time. The accumulation of pulses represents the measured quantity in unsigned integer units. This object is also concerned with the accurate representation of values presented on meter read-outs. This includes the ability to initially set the Present_Value property to the value currently displayed by the meter (as when the meter is installed), and to duplicate the means by which it is advanced, including simulating a modulo-N divider prescaling the actual meter display value.

Objects of type accumulator have the following properties:

•ackedTransitions

•description

•deviceType

•eventAlgorithmInhibit

•eventAlgorithmInhibitRef

•eventDetectionEnable

•eventEnable

•eventMessageTexts

•eventMessageTextsConfig

•eventState

•eventTimeStamps

•faultHighLimit

•faultLowLimit

•highLimit

•limitEnable

•limitMonitoringInterval

•loggingObject

•loggingRecord

•lowLimit

•maxPresValue

•notificationClass

•notifyType

•objectIdentifier

•objectName

•objectType

•outOfService

•prescale

•presentValue

•profileLocation

•profileName

•propertyList

•pulseRate

•reliability

•reliabilityEvaluationInhibit

•scale

•statusFlags

•tags

•timeDelay

•timeDelayNormal

•units

•valueBeforeChange

•valueChangeTime

•valueSet