Explanations:
:system:displaycontrast?: Query the display contrast.
:system:displaycontrast□<value>: Set the
display contrast. The contrast is an
integer among 0~32. 0 is the minimum, and 32 is maximum.
Return Format:
The query returns the current display contrast, and the range is 0~32.
10. :system:display:invert
Command Format:
:system:display:invert
Function:
The command inverts the display color.