The Keri's Neutron Controller is a small, low cost, single-door controller. Up to 8 Neutron mini-controllers may be attached to a RS-485 network, originating at a PC or Keri appliance, to control 8 doors with the option of using both in/out readers. Neutron has been designed with low cost and small physical size in mind, yet maintains a powerful feature set, nearly equal to Keri’s NXT controllers. In fact, Neutron runs on the Visual Doors version of Keri’s Door.NET software and maintains a 1000 credential capacity and a 4,000 event buffer (offline). The Neutron controller is designed to work with Keri’s NXT readers in both 125kHz and 13.56MHz. Traditional 125 kHz Wiegand readers and keypads are not supported. Supplied inputs and relay outputs are fixed to supporting REX (Request to Exit), DPS (Door Position Switch) and door relay.