Allow the user to enter traffic signal controller fault codes and receive details on the probably issues and methods to resolve. ATC Log File Reader and Interpreter. This App allows a Traffic Signal Controller Technician to enter Fault and Event Codes read from the Controller Event Log, and interprets and decodes these, producing a detailed written output that describes the event status and the probable causes that triggered the event/fault. It can also provide instructions of items to check and suggestions to resolve. Multi-lingual support is included for English, Chinese and Spanish.