8 alarm input and output connection – DVR systems DVRxx04HF-A Series User Manual

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3.8 Alarm Input and Output Connection

Please refer to the following sheet for alarm input and output connection. See

X287H287H287H

Figure 3-5.

1U series

1.5U Series

2U Series

Figure 3-5

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. Alarm input needs the low level voltage signal.