According to the BACnet protocol documentation:

Defines a standardized object whose properties represent the externally visible network security settings and status of a BACnet device. Secure BACnet devices shall contain exactly one Network Security object and they shall have an instance of 1. Operations on the Network Security object shall always be deemed to have sufficient authorization if the request is secured with an Installation key.

Objects of type networkSecurity have the following properties:

•baseDeviceSecurityPolicy

•description

•distributionKeyRevision

•doNotHide

•keySets

•lastKeyServer

•networkAccessSecurityPolicies

•objectIdentifier

•objectName

•objectType

•packetReorderTime

•profileLocation

•profileName

•propertyList

•securityPduTimeout

•securityTimeWindow

•supportedSecurityAlgorithms

•tags

•updateKeySetTimeout