This document specifies the LIN protocol including the signal management, frame transfer, schedule table handling, task behaviour and status management and LIN commander and responder node. It contains also OSI layer 5 properties according to ISO 14229-7 UDSonLIN-based node configuration and identification services (SID: B016 to B816) belonging to the core protocol specification. A node (normally a commander node) that is connected to more than one LIN network is handled by higher layers (i.e. the application) not within the scope of this document