IC Realtime Combo Series: 8 Channel DVR with built-in 10 LCD monitor - Manual (Page 27)

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Figure 3-6
3.9 Alarm Input and Output Connection
Please refer to the following sheet for alarm input and output connection. See
X287H287H287H
Figure 3-7.
Figure 3-7
There are two alarm input types for you to select: normal open (NO) and normal close (NC).
1. Alarm input
a. Please make sure alarm input mode is grounding alarm input.
b. Grounding signal is needed for alarm input.
c. When you are connecting two 10.2-inch combo DVRs or you are connecting one 10.2-inch
combo DVR and one other device, please use a relay to separate them,
2. Alarm output