This document specifies the LIN protocol including the signal management, frame transfer, schedule table handling, task behaviour, status management, and 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.