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INPUT Alarm Control and Detection
The input optocoupler supports two ways to connect external unsupervised alarms to Arecont Vision
camera.
Only one of the following two schemes should be used at any given time
.
OPTION-1:
UNSUPERVISED
ALARM
D
ETECTION
In this scheme the IN+ & IN- terminals can be used for external signaling devices, such as door
contacts or motion detectors. Both normally open and normally closed devices are supported as shown
in Figure 4:
IN
+
IN
-
G
N
D
O
U
T+
O
U
T-
IN+
IN-
Open /
Close
Figure 4
Figure 5 illustrates the unsupervised alarm conditions:
IN+
IN-
IN+
IN-
IN+
IN-
IN+
IN-
Normally Open
Normally Closed
Figure 5
The following table shows how camera detects unsupervised alarms:
Input Unsupervised Alarms
Terminals
External
Status
Camera
Status
IN+ & IN-
OPEN
OFF
CLOSE
ON
Camera status can be read with the following command:
OPTION-2:
INPUT
VOLTAGE
D
ETECTION
