GeoVision GV-AS2120 IP Control Panel - Manual (Page 61)

GV-AS110 / 1110 Controller
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To connect an output device:
The example below illustrates the connection of a locking device to GV-AS110 / 1110.
Connect the (+) point on the locking device to the Door COM wire on GV-AS110 / 1110,
connect the two (-) points of the locking device and the external power supply together, and
connect the (+) point on the external power supply to the Door NO or Door NC wire on GV-
AS110 / 1110 based on the state of the locking device.
Locking Device
Door COM
Door NO
Door NC
External
Power
Supply
- +
+
-
GV-AS110 / 1110
Figure 2-8