I think this goes back to the same issue I found earlier– the newer Smarthome PLM’s do NOT work with the EZIO8SA’s either. Smarthome has ACKNOWLEDGED this to me. The newer firmware I suspect also broke the serial interface.
I have a Prolific chipset USB-Serial adapter from “plugable.com” (as well as another Prolific adapter that I thought was broken, so I bought the other as well). It works, as I indicated, with the 2412 from SHN but NOT 2413 from Smarthome. Smarthome 2413S V1.5 1122, purchased about 60 days ago.