8
2.3
Alarm Connection
2.3.1
Alarm Port
The alarm port is shown as below. See Figure 2-4
Figure 2-4
Icon
Function
1
～
4
ALARM1
～
ALARM4. The alarm becomes activated in the
low level.
N1,N2,C1,C2
Two N activation output groups. (On-off button)
GND
A/B
485 communication port. They are used to control devices
such as PTZ. Please parallel connect 120T
Ω between A/B
cables if there are too many PTZ decoders.
Note
Different models support different alarm input ports. Please refer to the specifications sheet for
detailed information.
Slight difference may be found on the alarm port layout.
2.3.2
Alarm input port
Connect the positive end (+) of the alarm input device to the alarm input port (ALARM IN 1
～
4) of the
NVR. Connect the negative end (-) of the alarm input device to the ground end (
) of the NVR.
Note
When connect the ground port of the alarm device to the NVR, you can use any of the GND ports
(
).
Connect the C port of the alarm device to the alarm input port (ALARM) of the NVR.
When there is peripheral power supplying for the alarm device, please make sure it is earthed with
the NVR.
2.3.3
Alarm input and output port
There is peripheral power supplying for the external alarm device.
In case overload may result in NVR damage, please refer to the following relay specifications for
Summary of Contents for k-nl304g
Page 1: ...Network Video Recorder User s Manual Model No K NL304K G K NL308K G Version 1 0 2 ...
Page 58: ...50 Figure 4 51 Figure 4 52 ...
Page 78: ...70 Figure 4 70 Figure 4 71 ...
Page 79: ...71 Figure 4 72 Figure 4 73 ...
Page 86: ...78 Figure 4 80 Figure 4 81 ...
Page 87: ...79 Figure 4 82 Figure 4 83 ...
Page 90: ...82 Figure 4 86 Figure 4 87 4 11 Network 4 11 1 Basic Setup ...
Page 116: ...108 Figure 4 114 Figure 4 115 ...
Page 127: ...119 Figure 4 128 Figure 4 129 ...
Page 162: ...154 Figure 5 40 Figure 5 41 ...
Page 163: ...155 Figure 5 42 Figure 5 43 Figure 5 44 ...
Page 173: ...165 Figure 5 60 Figure 5 61 ...
