It seems that the program on Rossi's computer is simply a relay timer connected by a USB cable connection, and the power to the reactor must be shut off manually with the switch. That means that the Relay Code on the laptop display might be an ANSI code.
For a nuclear reactor, it sure does have a lack of monitoring capability. The coupler seems to have survived many months, so I guess overheating doesn't happen much, if at all. Or maybe if it does overheat, just the
bulb reactor itself fails harmlessly.