According to the BACnet protocol documentation:

Defines a standardized object whose properties represent the externally visible characteristics associated with a user of a physical access control system. The Access User object is used to represent an individual person, a group of users, or an asset. Relationships among access users are supported for representation of hierarchical organizations (e.g., companies, departments, or groups of any kind) or for representing ownership of assets.

Objects of type accessUser have the following properties:

•credentials

•description

•globalIdentifier

•memberOf

•members

•objectIdentifier

•objectName

•objectType

•profileLocation

•profileName

•propertyList

•reliability

•reliabilityEvaluationInhibit

•statusFlags

•tags

•userExternalIdentifier

•userInformationReference

•userName

•userType