For grid automation and substation automation, Advantech has developed rack mounted fanless box PCs used with data gateway and computing platform devices. The UNO-4000 series which feature a fanless design can be integrated with a wide variety of computing platforms and enhance the effectiveness of power transmission and substation automation. The rear IO connection and LEDs on front panel for all ports and modes, simplify the monitoring status for operation. The UNO-4000 series not only improve interoperability and interconnectivity, but also provide high reliable functionality to meet the harsh and critical requirements of grid automation and power substation automation.