Overview of specifications

The S2 Standard

The official standard (EN 50491-12-2) that has been approved by European Standardization bodies through CEN/CENELEC. To acquire access to the standard please refer to a national standardization body that is member of CEN/CENELEC or to ITEH.

S2-Json

A json-schema definition that describes all S2 messages.

The json-schema can be found here: s2-json.

The data model is also represented on this documentation website, see Reference.

S2-Connect

S2 Connect is a protocol specification enabling communication between an Energy Management System (EMS) and an Energy Smart Appliance (ESA) based on the S2 (EN50491‑12‑2) standard. It defines how devices discover, pair, communicate and unpair across local, cloud, and hybrid environments. It allows for a secure and fully interoperable solution between EMS and ESA.

The specification is published as open-access.