This technical report describes an architectured application layer used for communication with metering equipments in general, whatever the associated physical medium and lower layer protocols in a collapsed three-layer model are.
This technical report specifies the protocols to be applied for the application layer except the DLMS (Distribution Line Message Specification) model, which is already covered by IEC 61334-4-41.
IEC TR2 62056-51:1998 history
1998IEC TR2 62056-51:1998 Electricity metering - Data exchange for meter reading, tariff and load control - Part 51: Application layer protocols