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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.

S2 JSON
The GitHub project with JSON Schema of the official message definitions

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.

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S2 Connect specification
Read the full specification about interoperable device discovery, secure pairing, and authentication mechanisms
S2 Connect implementations
Status overview of S2 Connect implementations