According to the BACnet protocol documentation:

Specifies the date and time after which the credential will expire. This defines the end of the validity period of the credential. If the current time is after the expiry time, the credential shall be disabled and the value DISABLED_EXPIRED shall be added to the Reason_For_Disable list. The value DISABLED_EXPIRED shall be removed from the list when this condition no longer applies. If all of the fields of the BACnetDateTime value contain a value of X'FF', then the credential has an expiry time of 'end-of-time'.

Property expirationTime of object accessCredential can be read and written using a single IOTag.

Text Parameters

Numeric Parameters

Tag Value

A Date, Null or String (Xml) value representing a BACnet date/time.

•A null value means the date/time is empty/not set;

•A date/time value representing a precise date and time;

•A character string containing an XML with a value of type <BACnetDateTime>.