Thank you for your clever answers and help, I will read all of them slowly and check the different options shown.
By the moment, I am using a FT-817ND (which is the one I like to free for SOTA) and found the equivalence between the 2 rigs' data connector pins.
The FT-817 is working now for several years with an "U5 Link box for Yaesu" and I am currently waiting for the 10pin connector to arrive.In the meantime, I'll try your options.
If all works ok, that's the way it will remain. Otherwise, I'll try another solutions. I'll tell you how it all goes.
Actually, the final goal is to have Direwolf running as now is, on ver 1.6 under Debian 10 on an I5 PC. (I prefer much this than having it running under Windoze)
Thanks all you again!
73, Mikel EA2CW