21
Socket
Switch
cable
color
and
definition
Port
4-pin aviation port
1
DC power male socket. External is
negative and internal is positive.
（
Camera power
）
1
12V external camera power
2
DC power male socket. External is
negative and internal is positive.
（
Camera power
）
2
GND
3
Yellow BNC male port
（
Video
input
）
3
Audio
4
White BNC male port
（
Audio input
）
4
Video
Note
For some special series products, you need contact your local retailer for additional audio/video
output cable.
3.7 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. Alarm input supports grounding alarm input.
b. Alarm input 1-16 supports 12V voltage signal alarm input.
c. When the alarm device is connecting one DVR and one other device, please use a relay to
separate them,
2. Alarm output
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.
3. PTZ decoder connection
Support 2-channel analog signal level input. <0}
4. Please make sure the front-end device has soundly earthed.
Improper grounding may result in chip damage.
3.7.1
Alarm Input and Output Details
Alarm input and output interface is shown as in Figure 3-7.
