ISO 9506-2:2003
Industrial automation systems -- Manufacturing Message Specification -- Part 2: Protocol specification
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Part 1 provides a set of abstract models of information objects that may be found in such automated systems, and the specifications of a set of abstract services that operate on these models.
ISO 9506-2:2003 provides the protocol for the messages to be exchanged between client and server to realize support for the abstract services defined in Part 1.