According to the BACnet protocol documentation:

Defines a standardized object whose properties represent the externally visible characteristics of a credential that is used for authentication and authorization when requesting access. The credential can be owned by an access user of any type. Access user ownership is represented by a reference to an Access User object.

Objects of type accessCredential have the following properties:

•absenteeLimit

•activationTime

•assignedAccessRights

•authenticationFactors

•authorizationExemptions

•belongsTo

•credentialDisable

•credentialStatus

•daysRemaining

•description

•expirationTime

•extendedTimeEnable

•globalIdentifier

•lastAccessEvent

•lastAccessPoint

•lastUseTime

•objectIdentifier

•objectName

•objectType

•profileLocation

•profileName

•propertyList

•reasonForDisable

•reliability

•reliabilityEvaluationInhibit

•statusFlags

•tags

•threatAuthority

•traceFlag

•usesRemaining