Thank you, this has been most helpful in getting started.

The hex command (02 04 A0 60 00 00 FC) turned off my main room - successful!

In reviewing the Sony control protocol specification (listed on this site), I am have a difficult time understanding how you derived the hex code. I understand that 00 is the main room and 00 is off. If you could spare some time to explain, I would greatly appreciate it.

Thank you,
Chuck