IC Realtime H.264E Hybrid DVRs 4/8/16-CH Analog + 4/8/16-CH IP - Manual (Page 30)

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z Reduce the volume of the sound box.
z Using more sound-absorbing materials in decoration can reduce voice echo and
improve acoustics environment.
z Adjust the layout to reduce happening of the squeaking.
Figure 3-4
3.8 Alarm Input and Output Connection
The alarm input and output interface is shown as in Figure 3-5.
Figure 3-5
Please read the followings before connecting.
1. Alarm input
a. Please make sure alarm input mode is grounding alarm input.
b. Grounding signal is needed for alarm input.
c. Alarm input needs the low level voltage signal.
d. Alarm input mode can be either NC (normal Open) or NO (Normal Close)