Abstract
In order to cope with the complexity of the online control system, the DELPHI experiment at CERN (Aarnio et al., DELPHI Collaboration, Nucl. Instr. & Methods Phys. Res. A 303 (1991) 233–276) developed, in collaboration with the CERN OC group, a new concept for the coding of the control logic. In this concept — SMI, the State Management Interface (Barlow et al., IEEE Trans. Nucl. Sci. 36 (1989) 1549–1553) — the experiment is viewed as a collection of objects behaving as finite state machines. These objects are typically organized in hierarchical structures, allowing up to the full automation of the experiment by a a top-level object. This concept has been extended and is being redesigned using object-oriented techniques in SMI++ for the BaBar experiment at SLAC.
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