According to the BACnet protocol documentation:

Defines a standardized object whose properties represent the externally visible characteristics of a named data value in a BACnet device. A BACnet device can use a CharacterString Value object to make any kind of character string data value accessible to other BACnet devices. The mechanisms by which the value is derived are not visible to the BACnet client.

Objects of type characterstringValue have the following properties:

•ackedTransitions

•alarmValues

•commandTimeArray

•currentCommandPriority

•description

•eventAlgorithmInhibit

•eventAlgorithmInhibitRef

•eventDetectionEnable

•eventEnable

•eventMessageTexts

•eventMessageTextsConfig

•eventState

•eventTimeStamps

•faultValues

•lastCommandTime

•notificationClass

•notifyType

•objectIdentifier

•objectName

•objectType

•outOfService

•presentValue

•priorityArray

•profileLocation

•profileName

•propertyList

•reliability

•reliabilityEvaluationInhibit

•relinquishDefault

•statusFlags

•tags

•timeDelay

•timeDelayNormal

•valueSource

•valueSourceArray