UTC Fire & Security interlogix UVC-XP4DN-HR Guide De Démarrage Rapide page 4

Set the lens mode
If your lens has a manual iris, ignore this switch. It is for autoiris lenses
only.
Figure 2: Lens mode DIP switch and iris level adjustment
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1. Set to VD (video drive) for autoiris lenses with built-in amplifier.
2. Set to DD (direct drive) for autoiris lenses without amplifier.
3. DD adjustment.
Note: When the lens mode DIP switch is set to DD, you can use the
DD level screw (iris level adjustment) to ensure the correct exposure of
images for the camera's position and the lighting conditions. Use an
insulated tool to rotate the screw. Observe the results on the monitor
screen for the best setting.
Attach the lens
Refer to the instructions that came with the lens you purchased for
complete installation instructions of that lens.
Note: For optimal performance, use an autoiris lens.
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Quick Start Guide