Transponder
Greetings
I have a question as an ATC with regard to transponder information. My facility sees Mode A, S and ADSB and will display on our screens if we see any of those three. My question is that on the case of an aircraft with mode S and ADSB equipped is the physical method for inputting the call sign done in more than one place. Do you input a call sign on the mode S transponder and the ADSB machine? Do you input the call sign into a separate panel that covers both?
I ask the question because when the S or ADSB don't match the A we get an indication. Our system uses the A for coupling of tracks so you are tagged up correctly with the flight plan call sign. I want to know what is the most correct way of asking an aircraft to rectify the issue. Currently I say something like 'either your ADSB or Mode S is giving incorrect ident, could you check and set it to ABC123'
Do I need to specify the either/or part of the message?