ISO 9506是符合OSI通信模型的应用层通信规范。它提供了一套适用于自动化设备和查询或控制它们的系统之间通信的服务。它对交互的描述遵循客户机-服务器模型。它适用于任何支持全双工、可靠通信的网络，如互联网。 ISO 9506-1:2003提供了一组可能在此类自动化系统中找到的信息对象的抽象模型，以及在这些模型上运行的一组抽象服务的规范。 第2部分提供了在客户端和服务器之间交换消息的协议，以实现对第1部分中定义的抽象服务的支持。

ISO 9506 is an Application Layer communication specification, in accord with the OSI communication model. It provides a set of services appropriate to communications between automated equipment and systems that interrogate or control them. Its description of interactions follow the client server model. It is suitable for use over any network that supports full-duplex, reliable communication, such as the Internet. ISO 9506-1:2003 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. Part 2 provides the protocol for the messages to be exchanged between client and server to realize support for the abstract services defined in Part 1.