The VAXhyphen;based datahyphen;acquisition system for the International Fusion Superconducting Magnet Test Facility (IFSMTF) at Oak Ridge National Laboratory (ORNL) is a secondhyphen;generation system that evolved from a PDPhyphen;11/60hyphen;based system used during the initial phase of facility testing. The VAXhyphen;based software represents a layered implementation that provides integrated access to all of the data sources within the system, decoupling endhyphen;user data retrieval from various fronthyphen;end data sources through a combination of software architecture and instrumentation data bases. Independent VAX processes manage the various fronthyphen;end data sources, each being responsible for controlling, monitoring, acquiring, and disposing data and control parameters for access from the data retrieval software. This paper describes the software architecture and the functionality incorporated into the various layers of the data system.
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