Well, when I get in these odd rs-232 situations, if I really had to make it work on RS-232 and the "created-codes" don't work, I have plugged the device directly into a PC and used a "Terminal" program to send the "created-codes" to the device. The good part is the DVDO will send back info which can assist in determining what might be wrong with the code.

I see you are trying IR and sometimes that is just better all the way around, especially when you cannot make it work on rs-232.

Dave
RemoteQuest.com