Hatteland Display 26 inch - HD 26T21 MMC (Widescreen) - Manual (Page 37)

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Installation Procedures
Installation
IND100078-33
▼ 6: Depending on installation needs, you may mount the complete unit in ceiling in two different ways.
Upside Down Position: User Controls will be upside down, cables go straight up. You may configure Glass Display Control™
(GDC) LED symbols to show or not, since symbols will be seen upside down. Displayed image needs to be flipped vertically.
Review http://www.hatteland-display.com/inb100018-4.php (“Glass Display Control™ (GDC) LED & Button operations” section).
Normal Position: User Controls readable, no image flip needed, cables has to bend up or go straight down.
Upside Down Normal Position