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Open Metering System

The OMS-Group e. V.

The OMS-Group e. V. is a community of interest of associations, presently figawa and KNX, and enterprises in the area of metering relevant to billing. With the Open Metering System Specification the OMS-Group has developed an open, vendor independent standard for communication interfaces and basic requirements.


The new OMS Image Video visualises the advantages of the Open Metering System:

News & Events

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The OMS Newsletter “news4all“ is published four times a year and provides information on news and developments concerning the Open Metering System, the OMS specification and the OMS-Group including the members and the working groups.

The Open Metering System

The Open Metering System (OMS) is the only system definition across Europe which integrates all media (electricity, gas, heat and water incl. submetering) into one system. It was developed by the industry in order to guarantee a future-proof communication standard and interoperability between all the meter products.

The OMS specification is open and patent-free viable

The OMS specification describes the two-way communication between an OMS device, e.g. a smart meter, and a communication device (gateway). The OMS specification is publicly available and can be realized without any patent-infringements by all interested parties.