UNE-EN 62056-4-7:2016

This International Standard specifies a connection-less and a connection oriented transport layer (TL) for DLMS/COSEM communication profiles used on IP networks.These TLs provide OSI-style services to the service user DLMS/COSEM AL. The connection less TL is based on the Internet Standard User Datagram Protocol (UDP). The connection- oriented TL is based on the Internet Standard Transmission Control Protocol (TCP).Although the major part of the DLMS/COSEM TLs is the UDP and TCP as they are specified in the relevant Internet Standards, they include an additional sublayer, called wrapper.Annex A shows how the OSI-style TL services can be converted to and from UDP and TCP function calls.