８ USB/ MOUSE First USB for backup or upgrade system of DVR；Second
９ ON/OFF Power supply switcher
１０ DC-12V Power adapter port
ALARM IN：4CH alarm input port
ALARM OUT: N1 N2 for alarm output port, every channel
connect C and O; port is for GND;
8chanel alarm input, the mode of alarm input is no restriction (possible is normal open also normal close);
the GND alarm detector connect to COM under parallel connection (the power of alarm detector supply by
the ground terminal of alarm detector join-up in parallel with DVR;
the NC of alarm detector connect with the input end (alarm) of DVR;
when you want to reset the remote alarm of triggered , the +12V power supply of alarm detector supply by DVR,
for example, smoke detector.
When you select the external power supply, please share the GND with DVR;
selectable in normally open contact, also selectable in normally closed contact, the external alarm
device should be need Vcc;
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