Dormant thread?

Here are the (only) commands that worked for me on a MU8000:

Power Off 08 22 00 00 00 01 D5
Power On 08 22 00 00 00 02 D4
Enter (OK) 08 22 0D 00 00 68 61
Exit 08 22 0D 00 00 2D 9C
Return (back) 08 22 0d 00 00 58 71
Menu 08 22 0D 00 00 1A AF
Info 08 22 0D 00 00 1F AA
Up 08 22 0D 00 00 60 69
Down 08 22 0D 00 00 61 68
Right 08 22 0D 00 00 62 67
Left 08 22 0D 00 00 65 64

BTW, the "KEY_..." set did not work for me.

And don't make the mistake as I did of adding a command termination suffix (0D 0A): in my setup, it made things erratic, not to say totally non operational.