Q-See QC40198 - Manual (Page 27)

INSTALLATION & CONNECTION
QC40198 User Manual
18 | P a g e
Figure 3-5
3.7 Alarm Input and Output Connection
Refer to the following chart in Figure 3-6 for alarm input and output connection.
Figure 3-6
There are two alarm input types for you to select: normally open (NO) and normally closed (NC).
1. Alarm input
a. Please make sure alarm input is grounded.
b. Grounding signal is needed for alarm input.
c. When you are connecting two combo DVRs or you are connecting one combo DVR 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 establish the connection between the
alarm output port and the load.