Dynon
Unless there has been a change that I am not aware of, you will need an update
link for each piece. A while back, if you had a 100 and a 120 bussed up, these ports were interconnected with a null modem. Dynon eliminated this connection entirely, and all communication was achieved through the buss wiring. I have often wondered why a single port on the buss has not been introduced, and it might be worth an Email to them to inquire if that might be included with a future software update.
Regards,
Chris