Helllo,

I've set 2~9 pins in second parrallel card as inputs. By checking them with
actual switch keys, they work, that is the oem trigger leds which are on my new download
diagnostic screen turn on.

However, what i want to monitor them is by microcontroller. I connect output
pins of mcu to the parallel port. No matter I pull up or down on mcu's output pin, the oem
trigger leds do turn on or off when mcu program runs with those pin setting low.

Can anybody help to advise or what method can be implemented? Thanks,