From Radionics, the D7039 Multiplex Expansion Module enhances the capabilities of the D7024 fire alarm control panel. It expands the base system up to 255 addressable points, in-creases the number of relay outputs to 58 and adds an additional 400 events to the history buffer for a total of 499 events. System users are increased up to 100, an addition of 84 PINs from the base system.