Full Description

ISO 21806-2:2020 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.