Device Language Message Specification (DLMS) is an application layer protocol designed to support messaging to and from energy distribution devices in a computer integrated environment. Companion Specification for Energy Metering (COSEM) is an interface model of communicating energy metering equipment, providing a view of the functionality available through the communication interfaces. The data model uses generic building blocks to define the complex functionality of the meter as it is available at its interfaces. Communication with electricity metering equipment using the COSEM interface classes is based on the client – server paradigm, where the Metering Equipment plays the role of server and the client is a Meter Reading Instrument. A complete protocol stack which includes the application layer, a physical layer and all protocol layers between the two end layers is called a Communication Profile.
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