Grandstream Networks GXV3500 User Manual page 78

Unlike the Alarm_Out interface of Grandstream IP Camera (e.g.: GXV3611IR_HD or
GXV3662_HF/FHD where the related Alarm_Out interfaces are using relay switch), the
GXV3500 Alarm_Out is using photocoupler circuit.
If connecting to a multimeter, you will see the Ohm changed from unlimited to serveral hundred
Ohms depending on GXV3500 HW version.
Figure 41: Peering GXV3500 Decoder Alarm_Out Circuit
The above method can be used for installers to check the functionality of this feature at lab or on
field before the installation.
With the help of GXV3500 Decoder, customers can now free from the wiring limitation and have
the Alarm_Out feature for Grandstream IP66 weather-proof IP cameras.
Grandstream Networks, Inc. GXV3500 User Manual Page 78 of 82
Firmware Version 1.0.1.94 Last Updated: 05/2016