Upgrade of the SDL Control System

The Source Development Lab (SDL) at BNL consists of a 230 MeV electron linac and a 10 m long wiggler for short wavelength Free Electronic Laser (FEL) development. The original control system [1] was based on the one in use at the National Synchrotron Light Source. In 2000 the control system was upgraded to be based on EPICS to facilitate software interfaces for extensions at all levels. The FEL began commissioning in May 2001. The upgraded control systems have been stable, reliable and easy to operate. An overview of the control systems, including for the linac, the waveform digitizer controls, video system/image processing and radiation monitor/alarms will be presented.