IEC 61158-6-21 Ed. 2.0 en:2019

IEC 61158-6-21 Ed. 2.0 en:2019 Industrial communication networks - Fieldbus specifications - Part 6-21: Application layer protocol specification - Type 21 elements
standard by International Electrotechnical Commission, 06/20/2019

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IEC 61158-6-21:2019(E) specifies the protocol of the Type 21 fieldbus application layer, in conformance with the OSI Basic Reference Model (ISO/IEC 7498-1) and the OSI application layer structure (ISO/IEC 9545). It defines the protocol provided to define the wire-representation of the service primitives defined in IEC 61158-5-21:2010, and the externally visible behavior associated with their transfer.