What is xDLMS?
xDLMS is an extension to the DLMS standard.
The main objective of the COSEM approach is to provide a business domain oriented interface object model for metering devices and systems while keeping backward compatibility to the existing DLMS standard. To meet these objectives, COSEM includes an evolution of DLMS. Remaining fully compliant to the DLMS standard, COSEM provides a more metering specific view of the meter through the COSEM interface objects.
xDLMS is the application layer service element providing access to the COSEM objects. It contains a few new services, mainly to support LN referencing, and defines additional data types. It defines new conformance block. The current DLMS version of xDLMS is 6.