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Download: OPC Historical Data Access (OPC HDA) 1.20 Specification

The intent of this specification is to facilitate the development of OPC Servers for Historical Data Access in C and C++, and to facilitate development of OPC client applications in the language of choice. The architecture and design of the interfaces described in this specification are intended to support development of OPC servers in other languages as well.

This specification tries to identify interfaces used to pass historical information between components which would be suitable to standardization. Additionally this document details the design of those interfaces in such a way as to complement the existing OPC Data Access Interfaces.

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