Bosch Appliances Security Camera NDN-921 User Manual

FlexiDomeHD 720p IP Camera

Installation | en

Bosch Security Systems

Installation and Operation Manual

AR18-10-B013 | v1.52 | 2011.06

Use the alarm relay output for switching external devices such 

as lamps or sirens. 

–

Maximum voltage 30 VAC or 40 VDC; maximum 0.5 A 

continuous, 10 VA. 

–

Refer to the cable tree table to identify the wire colors for 

connecting the alarm output.

–

In the menu system, configure the relay output to operate 

as either normally open (NO) or normally closed (NC).

The unit has full-duplex mono audio. The two-way 

communication can be used to connect a speaker or door 

intercom system. The audio input signal is transmitted in sync. 

with the video signal. Refer to the cable tree table to identify 

the wire colors for connecting the audio input and output.

Audio input: Line input level (not suitable for direct 

microphone signal); impedance 9 kOhm typical; 5.5 Vpp 

maximum input voltage.

Audio output: Line output level (not suitable for direct speaker 

connection); impedance 16 Ohm minimum; 3 Vpp maximum 

output voltage.

Wiring: Shielded audio connection cable is advised. Observe 

maximum cable lengths for audio line input and output levels.

1.

Secure all cables.

2.

Route the cable tree from the camera around the rear of 

the camera module mounting base.

3.

For surface mounted units, secure the camera module 

mounting base to the surface mounting box with the three 

supplied screws.

4.

For flush mounted units, secure the camera module 

mounting base to the ceiling or wall.