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Main controller is basically just a box, housing many pieces of the system in one piece. This box contains the main computer, audio amplifier, the IO controller, relays and power sources and the extender local end for the connection of the entrance unit.

This box is typically installed on wall inside the library. It must have a maximum of 30 meters direct cable run to the entrance unit.

The main controller box dimensions are 400mm wide, 500mm high and 210mm deep.