Dahua DHI-NVD0905DH-4I-4K - Page 17

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 For the above four series, they only have different decoding card types. The rest parts are the
same.
 For 12/15/18/21-channel 4K high definition series and 12/15/18/21-channel 4K high definition
(with 4 input ports) series, the only difference is one series has the capture card and the other
does not have capture card. The rest parts are the same.
2.2.2.8 Main Control Board
Figure 2-10 Main control board
Table 2-9 Main control board introduction
No. Name No. Name No. Name
1 Default button 2
 Power indicator of
main control
board
System status

indicator
PCI-
E status

indicator
3 USB port
4 HDMI output port 5
Microphone port
(Reserved)
6 Earphone port (Reserved)
7 Network port 8 Alarm clear button 9
2-channel alarm input,
1-channel alarm output,
RS–485 port
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RS–232 port of
screen control
11 RS–232 serial port – –