A system and method are disclosed for detecting open flames in an outdoor environment. The scan circuit includes a multiplexer having two data inputs respectively coupled to the scan data input and normal data input of the scan circuit, having a control input coupled to the scan enable input of the scan circuit, and having an output. In addition, a factory mode data receiving process includes the steps of sending back the start data received to the external controller, storing mode timing data received into a factory mode address reserved in a memory in the monitor and ending the reception of mode timing data when mode end data is inputted.