@mrehorstdmd thanks , I have led on my endstop , I would like to use duet 3 , but if I got it right it doesn't support that .

If I got is right , the duet 3 doesn't support led status lights for the optical endstop , only the duet 2 , can it be confirmed , is there anyway to overcome that difficulty ? can I still use the duet 3 with optical endpoints ?