Talos Security DR800 Series DVR User Manual - Manual (Page 85)

H.264 Network DVR
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Appendix B: Alarm Input Interface Instruction
4/8CH alarm input, no input limitation any N/O or N/C contact.
NC terminal of alarm detector connect to DVR alarm input (ALARM)
If the user wants to attach a detector (such as smoke detector) external power must be used.
The external power should share the same ground with the DVR if the device is supply by external power.