The 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.