The isolated PMBus has a three channel A/D converter which measures the output voltage, output current, and the internal temperature. It can also be used to set the output voltage and over-current limit. The power supplies can also turned ON and OFF remotely using the digital interface. The PMBus interface reports back any alarms; over-temperature, overvoltage, fan failure, AC input out of range, and DC Good, as well as giving over temperature warnings and programming errors. The SMBALERT# line communicates directly with the host with warnings and alarms.