ISO 21806-2:2020 (R2026)

This document specifies a part of the application, the application layer, and the presentation layer. The application covers the — device model, — registry management, — connection management for streaming data, — diagnosis, and — error handling. The application layer covers the structure of MOST messages consisting of — addressing, — function block identifiers, — instance identifiers, — function identifiers, — operation types, and — timing definitions. The presentation layer covers the definition of data, basic data types and function classes.