I know that this subject has been researched to the ends of the earth, but DTV sent me a document that says the H10 needs " all commands need a carriage return to be recognized. Therefore, each carriage command string input must be followed by an 0x0D( the carriage return hex code)." In another section it said the GetCommand Version is not supported. I do not know about serial command specifics, but I was hoping this could help. I have not seen this information anywhere else in my forum searches, so please go easy if I missed it. I was able to control the H10 with snapstream's beyondtv without flaw, and they listed the H10-200 specificly. I'm thinking this is just a software issue, so if anyone knows how to modify the replays serial commands to add this carriage command hex code please let me know. Thanks and good luck!