Optoma HT31 Manual page 43

Keypad Lock
When the keypad lock function is "On", the control panel will be locked how-
ever, the projector can be operated by the remote control. By selecting "Off",
you will be able to reuse the control panel.
Note
To turn off the keypad lock, press and hold "Enter" key on top of the projector for 5
seconds.
Test Pattern
Display a test pattern. There are Grid, White pattern and None.
12V Trigger
Choose the setting from On / Off to Auto 3D to set 12V Trigger.
+12V
GND
Note
12V Trigger A Relay Connector support 12V, 250mA. 3.5mm Mini Jack.
IR Function
Choose the setting from On / Front / Back to Off and then choose "Yes" to
apply the selection.
Background Color
Use this feature to display a "Black", "Red", "Blue", "Green" or "White",
screen when no signal is available.
Remote Settings
Allow user to define a short cut key on the remote control, and the function
item is selected in OSD menu.
Advanced
Direct Power On
Choose "On" to activate Direct Power mode. The projector will automatically
power on when AC power is supplied, without pressing the "
projector control panel or on the remote control.
Signal Power On
If Signal Power On is activated, the projector will turn on automatically when
VGA signal is detected.
" key on the
EN-43