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c. Alarm input needs the low level voltage signal.
d. Alarm input mode can be either NC (normal Open) or NO (Normal Close)
e. When you are connecting two DVRs or you are 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 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 DVR, 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, 120Ω 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 DVR 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.
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