IEC 62056 is a set of standards for Electricity metering data exchange by International Electrotechnical Commission.
The IEC 62056 standards are the International Standard versions of the DLMS/COSEM specification. DLMS or Device Language Message Specification (originally Distribution Line Message Specification),
COSEM or Companion Specification for Energy Metering, includes a set of specifications that defines the Transport and Application Layers of the DLMS protocol.
- quote from Wikipedia page on IEC 62056
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