Dahua NVR21-4KS3 Series User Manual page 94

Icon Name
MIC OUT Audio output port
1–16 Alarm input port 1–16
Ground
NO1–NO5
C1–C5
Alarm output port 1–5
NC5
A
RS-485 communication
port
B
CTRL (CTRL 12
—
V)
P (+12 V) —
RS-232 RS-232 debug COM
Function
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.
● There are four groups. The first group is from
port 1 to port 4, the second group is from port
5 to port 8, the third group is from 9 to 12, and
the fourth group is from 13 to 16. 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 ground end.
● 5 groups of alarm output ports. (Group 1:
port NO1–C1, Group 2:port NO2–C2, Group 3:
port NO3–C3, Group 4: port NO4–C4, Group 5:
port NO5, C5, NC5). 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.
● NC: Normal close alarm output port.
RS485_A port. It is the cable A. You can
connect to the control devices such as speed
dome PTZ.
RS485_B. It is the cable B. You can connect to
the control devices such as speed dome PTZ.
Controller 12 V power output. It is
to control the on-off alarm relay
output. It can be used to control
the device alarm output. At the
same time, it can also be used as
the power input source of some
devices such as the alarm detector.
+12 V power output port. It can
provide the power to some
peripheral devices such as the
camera or the alarm device. Please
note the supplying power shall be
below 1 A.
It is for general COM debug to configure IP
address or transfer transparent COM data.
74
User's Manual
The two
ports
serve as
another
group of
alarm
output
ports.