dit vond ik op de elo site. http://media.elotouch.com/pdfs/manuals/intelli.pdf
IntelliTouch Serial Controllers The IntelliTouch serial controllers have one green diagnostic LED.
Following power on, the controller performs a short self-test, where the LED stays lit.
After the self-test, the LED flashes once per second, indicating normal operation.
The self-test results are displayed by most Elo driver software.
During normal operation, the LED also indicates controller/host communication is in progress.
When the touchscreen is touched, the LED should ligh