Dlms Meter Serial Number4/23/2021
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Today, it is a global organization with 300 members from all continents and 60 countries involving utilities, meter manufacturers, system developers and integrators, and chip manufacturers. DLMSCOSEM comprises three key components: COSEM - Companion Specification for Energy Metering - the object model capable of describing virtually any application; OBIS - Object Identification System, the naming system of the objects; and DLMS - Device Language Message Specification - the application layer protocol that turns the information held by the objects into messages. DLMSCOSEM can be used for all utilities energy kinds, all market segments, all applications and over virtually any communication media. COSEM interface classes and their instantiations (objects) can be readily used for modelling metering use cases, yet general enough to model any application. Object modelling is a powerful tool to formally represent simple or complex data. Objects may have several attributes and also methods to perform operations on the attributes. Objects can be used in combinations, to model simple use cases such as register reading or more complex ones such as tariff and billing schemes or load management. Today there are 89 interface classes specified, but up to 65 535 are possible. OBIS codes are specified for electricity, gas, water, heat cost allocators (HCAs) and thermal energy metering, as well as for abstract data that are not related to the energy kind measured. The hierarchical structure of OBIS allows classifying the characteristics of the data e.g. The rest can be used for manufacturer, country and consortia specific purposes. DLMSCOSEM uses a client-server paradigm where the end devices, typically meters are the servers and the Head End Systems or concentrators are the clients. The DLMSCOSEM application layer provides: the ACSE services to connect the clients and the servers; and the xDLMS services to access the data held by the COSEM objects. The xDLMS services are the same for each object; this allows new objects to be added to the model without affecting the application layer. The application layer also builds the messages (APDUs, Application Protocol Data Units), applies, check and removes cryptographic protection as needed and manages transferring long messages in blocks. The messages can be then transported over virtually any communication media. There are various built-in mechanisms available for optimizing the traffic to the characteristics of the media. Communication profiles are available for: Local ports, PSTNGSM: with HDLC data link layer RS232 RS485; GPRS; IPv6, IPv4, TCP and UDP; S-FSK PLC; G3-PLC with UDP IPv6; Prime PLC without IP, with IPv6, IPv4, TCP and UDP; Wired and wireless M-Bus; Mesh networks with IPv6 and 6LowPAN; Coming soon: Wi-SUN and NB IoT. The contents of these Books are internationally standardized by IEC TC13 WG14 and CEN TC294.
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