According to the BACnet protocol documentation:

Indicates the time at which the Present_Value, Current_Command_Priority, or Value_Source last changed.

Property lastCommandTime of object binaryValue can be read and written using a single IOTag.

Text Parameters

Numeric Parameters

Tag Value

A Date, Integer, Null or String (Xml) value representing a timestamp in BACnet.

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

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

•An integer defining the timestamp sequence number;

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