My setup - HR24-200 sending commands via URC MSC-400. New adapter, same result. Is it possible this is a firmware issue? I have the latest version. I'm thinking about rolling it back to see what happens. What exactly occurs when you have an incompatible USB to Serial adapter? Nothing works at all, or problems as I'm experiencing? Something else I've been noticing... everytime I do a red buttton reset, it crashes the wireless on my router!?!??! I really don't get that part. I don't even have the HR24 RJ45 to the router. I am, however, using the whole home MOCA thingee that they gave me.