Optoma Optoma EP771 - Manual (Page 18)

Setup and Operation
18
I
TEM
L
ABEL
D
ESCRIPTION
USB Connect the supplied USB cable from a computer for USB mouse func-
tion and firmware upgrades.
12V Connect a 12-volt trigger cable from the screen to this connector. When
connected, the screen automatically adjusts vertically to match the
screen aspect ratio.
RS-232 Reserved for installation control.
Warning:
As a safety precaution, disconnect all power to the projector and connecting devices before making
connections.