Mariko,
Yes, I understand now what you meant. No need to apologise for your English. I speak a bit of Italian, but I probably couldn’t manage a technical exchange on an Italian Forum so you have my respect.
From a screenshot of Clive’s Configuration Screen (which I have been shown privately), he seems to have had his Mode CS filter set to +/- 500ft - which would have filtered out his own Mode S above that height when his PAW unit was on the ground, and below that height close to the airfield it might not have been getting interrogated by RADAR, so wouldn’t be transmitting Mode S, but that shouldn’t have prevented his Mode S-ES (ADSB) from transmitting unless his transponder has some sort of Ground or Speed Limit Switch.
Hopefully the setup I have asked him to try and screenshots I have asked for will clarify the situation.
Best Regards
Peter