Good Morning, I am attempting to download a computer based remote programming code onto an MX-850 remote. I get messages stating the com port is incorrect. I am using a serial to USB adapter(Keyspan) on a Compaq laptop. How do I check into this issue? To be honest, I haven't a clue. Thanks for any assistance. PS- The adapter is because the cable to the remote is serial, and I only have USB inputs on the laptop.