Bosch Appliances Security Camera NDN-921 User Manual

FlexiDomeHD 720p IP Camera

Advanced Mode | en

Bosch Security Systems

Installation and Operation Manual

AR18-10-B013 | v1.52 | 2011.06

The Day/Night camera is equipped with a motorized IR 

(infrared) filter. The IR filter can be removed in low-light or IR-

illuminated applications. There are four different methods of 

switching:

–

via the alarm input,

–

as part of the programmable mode profile,

–

automatically, based on the observed light levels, or

–

via the settings page.

For reliable Day/Night switching with an external IR illuminator, 

synchronize the switching of the IR filter in the camera with the 

IR illuminator using an alarm input port.

Auto - the camera switches the IR cut-off filter on and off 

depending on the scene illumination level.

Monochrome - the IR cut-off filter is removed, giving full IR 

sensitivity. 

Color - the camera always produces a color signal regardless of 

light levels. 

Set the video Switch level at which the camera in Auto mode 

switches to monochrome operation (-15 to 0 to +15). 

A low (negative) value means that the camera switches to 

monochrome at a lower light level. A high (positive) value 

means that the camera switches to monochrome at a higher 

light level.

In Auto switching mode, set the camera priority to either:

–

Color: the camera gives color pictures as long as the light 

level permits.

–

Motion: the camera gives sharp images without motion 

blur as long as the light level permits (it switches to 

monochrome earlier than it would with Color priority).