Dear electric5,
So from the data sheet, it looks like "A single command consists of 6 continuous single byte RS-232 transmissions. The following is an example of SYNC (AA0D00000000h) command (p. 3 of the data sheet you attached).
If the device is expecting 6 byte commands,and you are sending AA 0D (2 bytes), I think your device will interpret the input that you show in your setup picture as commands structured like this: (AA0DAA0DAA0D). What happens if you try sending the sync command (AA0D00000000h) over and over?
Best Regards,
~Nate