Dahua NVR21-4KS3 Series User Manual page 60

Name
Alarm input
1–16
port 1–16
GND
NO1–NO3
Alarm output
port 1–3
C1–C3
A
RS-485
communication
port
B
CTRL (CTRL 12
—
V)
P (+12 V) —
Network port
eSATA eSATA port
USB port
RS-232 debug
RS-232
COM
High Definition
HDMI
Media Page
Function
● 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 port.
● 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.
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.
One 10/100/1000 Mbps self-adaptive Ethernet port.
Connect to the network cable.
External SATA port. It can connect to the device of the SATA
port. Please jump the HDD when there is peripheral
connected HDD.
USB port. Connect to mouse, USB storage device, USB
burner and more.
It is for general COM debug to configure IP address or
transfer transparent COM data.
High definition audio and video signal output port. It
transmits uncompressed high definition video and
multiple-channel data to the HDMI port of the display
device. HDMI version is 1.4.
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User's Manual
The two ports
serve as
another
group of
alarm output
ports.