Amcrest General 1080P(V2) Mini 1U Series, User Manual, Page: 30 / 188

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The alarm output port should not be connected to high power load directly (It should be less than 1A) to
avoid high current which may result in relay damage. Please use the relay between the alarm output port
and the load.
3. How to connect PTZ decoder
a. Ensure that the decoder has the same grounding with DVR, otherwise you may not be able to control
the PTZ. Shielded twisted wire is recommended and the shielded layer is used to connect to the ground.
b. Avoid high voltage. Ensure proper wiring and take some thunder protection measures.
c. For signal wires that are too long
, 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 another device.
e. The voltage between the A,B lines of the decoder should be less than 5v.
4. Please make sure the front-end device has soundly grounded.
Improper grounding may result in chip damage.
3.7.1 Alarm Input and Output Details
Important
Please refer to the specifications for the alarm input and output channel amount. Do not merely
count the alarm input and out channel amount according to the ports on the rear panel.
The following interface is based on the 8-channel advanced 1080P (V2) mini 1U Series. See Figure 3-1.
Figure 3-1
1
，
2
，
3
，
4
，
5
，
6
，
7
，
8
，
9
，
10
，
11
，
12
，
13
，
14
，
15
，
16
ALARM 1 to ALARM 16. The alarm becomes active in low voltage.
NO1 C1
，
NO2 C2
，
NO3 C3
，
Three normal open groups (on/off signal)
Earth cable.
3.7.2 Alarm Input Port
Please refer to the following sheet for more information.

Grounding alarm inputs. (Normal open or Normal close type)

Please parallel connect COM end and GND end of the alarm detector (Provide external power to the
alarm detector).