VIEWSONIC ViewBoard IFP8662 86" 4K Interactive Display - Manual (Page 125)

125
2-2. When Display is ON and receives the IR POWER code: Display will forward the
POWER code to the host via RS232, then turn off itself.
2-3. When SET-POWER LOCK is enabled, the Display will not respond to POWER
key pressing.
3. The VOLUME UP and VOLUME DOWN code will repeatedly output when you
press and hold the keys.