Optoma 1080p DLP - Manual (Page 34)

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User Controls
12V Trigger
 STD: When “STD” is selected, 12V Trigger will send 12V when
projector turn on.
 LBX: When 12V trigger set as “LBX” --
1. Format change to “LBX”,12V trigger port will send 12V.
2. Format is “4:3”, “16:9”, or “Native”, 12V trigger port won’t
send 12V, it will be 0V.