A control system for a common access cabinet having a plurality of drawers and electrically controlled latches. Each latch corresponds to one drawer and is configured to receive an electrical signal. The electrical signal contains an address assigned to a particular drawer. When a latch receives a signal that defines the address of the drawer to which that latch corresponds, the latch unlocks that corresponding drawer. The latches receive the signals over an asynchronous serial interface bus. A user input device receives user identification data that is processed by a processor device to determine if the user is authorized to access any of the drawers. If the user is authorized, the processor device generates a signal that contains an address that corresponds to a drawer identified in the user identification data. The signal is converted to an asynchronous serial signal which is routed to the asynchronous serial interface bus.