The SL−280 is a master/space controller (Kramer Control brain) that can operate over Ethernet with control interfaces that include: eight bidirectional RS−232, eight IR, eight GPI/O, and eight relays. It controls devices such as scalers, video displays, audio amplifiers, Blu−ray players, sensors, screens, shades, door locks, and lights. Multiple Kramer Ethernet control gateways can be used to add remote I/O ports.