Thank you for your quick answer. I solved the problem, you were right the mount wasn't detected properly. I downloaded the last version of the Prolific driver and reinstalled it (rookie mistake, sorry). Now Ekos connects without any problem to the SW EQ6R-PRO mount and to all the other equipment.
Thank you again
I have received my new brand skywatcher EQ6R pro mount and I'm having problems to connect it to Ekos in my Mac via the new USB port with EQMOD driver.