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This chapter shows how to use the OPC custom interface. It also lists the interfaces and methods of the OPC customer interface. This is not a detailed interface description but contains supplementary information and notes relating specifically to the Computing software. There is now an extended version of the OPC custom interface, specification 2.0. Version 2.0 supplements the existing OPC custom interface in several aspects particularly those simplifying the handling of asynchronous communication. The interfaces of Version 1.0 of the OPC interface are completely upwards compatible with Version 2.0.

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