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Communication and synchronization aspects of a mixed hardware control and data acquisition system

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7 Author(s)
Schmidt, V. ; Istituto Gas Ionizzati, Padova, Italy ; Flor, G. ; Hemming, O.N. ; Luchetta, A.
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Aspects of the control and data acquisition system of the RFX nuclear fusion experiment are dealt with. The system is built around a local area network that connects programmable controllers, minicomputers with CAMAC front-end, and personal computes as operator consoles. These three types of nodes use compatible software that contains a set of low-level routines corresponding to levels one to four of the ISO OSI (Open Systems Interconnection) recommendations. A detailed description is provided of how the overall system synchronization is achieved. All subsystems (computer and programmable-controller based) follow the same state transition diagram (scheduler) and are coordinated by a supervisor system based on a programmable controller. The solution proposed for the precision timing and waveform generation and its integration with the overall system synchronization are described

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Nuclear Science, IEEE Transactions on  (Volume:36 ,  Issue: 5 )