scope:

This part of IEC 62056 specifies the COSEM application layer in terms of structure, services and protocols, for COSEM clients and servers. Data communication services with COSEM interface objects, using Logical Name (LN) referencing and Short name (SN) referencing are specified. COSEM servers use either LN or SN fererencing during a given association: this is negotiated during the Application Association establishment. The COSEM client always uses LN referencing. If the client communicates with a server using SN referencing, the LN services are mapped to SN services.