DVR systems NVR38xx Series - Manual (Page 19)

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2.2 Rear Panel
2.2.1 1 U Series
The 1U series NVR real panel is shown as in Figure 2-3.
Figure 2-3
Please refer to the following sheet for detailed information.
Port Name Connection Function
USB port. Connect to USB mouse.
Network port 10M/100M self-adaptive Ethernet port. Connect
to the network cable.
RS232 232 debug
COM. It is for general COM debug to configure IP
address or transfer transparent COM data.
HDMI High Definition
Multimedia
Interface High definition video signal output port.
Transmit the clear video and multiple-track data
(Uncompressed)to the device of HDMI(High
definition media interface)
VGA VGA video
output port VGA VGA video output port. Output analog video
signal. It can connect to the monitor to view
analog video.
1～16 Alarm input port.
1～16 I/O port
 Four groups of alarm input ports. 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 port
ground end Alarm input ground end.