20
d. Alarm input mode can be either NC (normal Open) or NO (Normal Close)
e. When you are connecting two NVRs or you are connecting one NVR and one other device, please use
a relay to separate them.
2. Alarm output
The alarm output port should not be connected to high power load directly (It shall be less than 1A) to
avoid high current which may result in relay damage. Please use the co contactor to realize the
connection between the alarm output port and the load.
3. Please make sure the front-end device has soundly earthed.
Improper grounding may result in chip damage.
2.4.1 Alarm Port
2.4.1.1 NVR616-4KS2 Series
You can refer to the following sheet
X for alarm input and output information. See Figure 2-15.
Figure 2-15
Icon Note
1，2，3，4，5，6，7，
8， 9， 10 ， 11 ， 12，
13，14，15，16
ALARM 1 to ALARM 16. The alarm becomes active in low voltage.
1-ON C，2-ON C，
3-ON C，4-ON C，
5-ON C，6-ON C，
7-ON C，8-ON C
Eight groups of normal open activation output (on/off button)
G GND cable.
A/B
The A/B cable to control the RS485 devices. It is to connect to
control devices such as PTZ dome camera. 120Ω should be parallel
connected between A, B lines on the far end to reduce reflection and
guarantee the signal quality.
Tx and Rx RS232 port. Tx is the data output cable and the Rx is the data input
cable.
2.4.1.2 NVR608-4KS2 Series
You can refer to the following sheet for alarm input and output information. See Figure 2-16.
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