IC Realtime 4 Channel PoE Mobile Network Video Recorder - Manual (Page 25)

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c. When the alarm device is connecting one NVR and one other device, please use a relay to
separate them,
2. Alarm output
The alarm output port should not be connected to 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. How to connect PTZ decoder
a. Ensure the decoder has the same grounding with NVR, otherwise you may not control the PTZ.
Shielded twisted wire is recommended and the shielded layer is used to connect to the grounding.
b. Avoid high voltage. Ensure proper wiring and some thunder protection measures.
c. For too long signal wires, 120 Ω should be parallel connected between A, B lines on the far end
to reduce reflection and guarantee the signal quality.
d. “485 A, B” of NVR cannot parallel connect with “485 port” of other device.
e. The voltage between of A,B lines of the decoder should be less than 5v.
4. Please make sure the front-end device has soundly earthed.
Improper grounding may result in chip damage.
3.6.1 Alarm Input and Output Details
Alarm input and output interface is shown as in Figure 3-8.
Figure 3-8
Please refer to the following sheet for detailed information.
SN Function
1-8
Alarm input 1-8
9
GND
10/11
Alarm output1
12/13
Alarm output2
14
GND
15
On-off 12V output