Exterior NVR21 Series, User Manual

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58
Port Name Function
1-8 Alarm input
port 1-8.

There are two groups. The first group is
from port 1 to port 4; the second group is
from port 5 to port 8. They are to receive
the signal from the external alarm
source. There are two types; NO (normal
open)/NC (normal close).

When your alarm input device is using
external power, please make sure the
device and the NVR have the same
ground.
Alarm input
port ground
end Alarm input ground end.
NO1
～
NO3
Alarm output
port
1
～
3

3 groups of alarm output ports. (Group
1
：
port NO1
～
C1,Group 2:port NO2
～
C2,Group 3:port NO3
～
C3
）
).Output
alarm signal to the alarm device. Please
make sure there is power to the external
alarm device.

NO
：
Normal open alarm output port.

C
：
Alarm output public end.
C1
～
C3
A RS485
(RS-485)
communication
port RS485_A port. It is the cable A. You can
connect to the control devices such as speed
dome PTZ.
B RS485_B.It is the cable B. You can connect
to the control devices such as speed dome
PTZ.
Power input
port Input DC 12V/5A.
Power button Power on/off button.
VIDEO OUT Video input
port CVBS output
MIC IN Audio input
port Bidirectional talk input port. It is to receive the
analog audio signal output from the devices
such as mike phone, pickup.
MIC OUT Audio output
port Audio output port. It is to output the analog
audio signal to the devices such as the sound
box.

Bidirectional talk output.

Audio output on 1-window video monitor.

Audio output on 1-window video
playback.
2.2.13
NVR52-P Series
The NVR52-P series rear panel is shown as below. See Figure 2-34.