The detector control system for BaBaR

The hardware/software system for the control of the BABAR Detector at PEP-I I is described. The contributions of a large and diverse collaboration were channeled into a standard hardware selection (VME crate, embedded CPU, fie ldbus, etc.) and a uniform software environment, EPICS (Experimental Physic s and Industrial Control System). These choices, with a judicious naming co nvention in place, allowed a distributed and modular development of the con trol system, which was then integrated within the Online System in the Inte raction Hall. The design of the software to complement the EPICS layer is p resented. The coordination of controls activities with the rest of the Online is over seen by Run Control; the interface and functionality that controls supports is described. The archival storage, retrieval and analysis/display of the process control data is described, as well as the interface that allows acc ess to this data with the same API as for our physics data. We also describ e our modifications to the Online-wide messaging system ("cmlog") and our i nterface to the accelerator; PEP-II. Finally, we present our operational ex periences with the control system.