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Installation and Connections
20
Reduce the volume of the sound box.
Use more sound-absorbing materials in decoration to reduce voice
echo and improve acoustics environment.
Adjust the layout to reduce the occurrence of the squeaking.
Alarm Input and Output Connection
Please refer to the following sheet for alarm input and output connection.
There are two alarm input types for you to select: normal open (NO) and
normal close (NC).
1. Alarm input
a Please make sure alarm input mode is grounding alarm input.
b Grounding signal is needed for alarm input.
c When you are connecting two DVRs or connecting one DVR and
one other device, please use a relay to separate them
2. Alarm output
The alarm output port should not be connected to a high power load
directly (It shall be less than 1A) to avoid high current which may result
in relay damage. Please use the co contactor to realize the connection
between the alarm output port and the load.
3. Please make sure the front-end devices have been well earthed.
Improper grounding may result in chip damage.
Alarm Input and Output Details
You can refer to the following sheet and Figure 3-1 for alarm input and
output information.