SL?240C is a compact master/space controller (Kramer Control brain) with PoE. It can operate over Ethernet with control interfaces that include: four bidirectional RS?232, four IR, four GPI/O, and four 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.