Grandstream Networks GDS3712 User Manual

Alarm_In could use any 3rd party Sensor (like IR Motion Sensor).
Alarm_Out device could use 3rd party Siren, Strobe Light, or Electric Door Striker, etc.
The figure below shows an illustration of the Circuit for Alarm_In and Alarm_Out.
Figure 15: Alarm_In/Out Circuit for GDS370x
Notes:
The Alarm_In and Alarm_Out circuit for the GDS370x should meet the following requirement:
Alarm Input 3V<Vin<15V, PINs (1.02KΩ)
Alarm Output 125VAC/0.5A, 30VDC/2A, Normal Open, PINs
The Alarm_In circuit, if there is any voltage change between 3V and 15V, as specified in the table above, the GDS370x
Alarm_In port will detect it and trigger the action and event.
Higher voltage and wrong polarity connections are prohibited because this will damage the devices.
Protection Diode
When connecting the GDS370x to a door strike it is recommended to set an EMF protection diode in reverse polarity for
secure use, below are examples of deployment for the protection diode.
Figure 16: Protection Diode – Example 1
The reverse EMF protection diode must always be installed in reverse polarity across the door strike.

Grandstream Networks GDS3712 Specifications

General

Brand	Grandstream Networks
Model	GDS3712
Category	Intercom System
Language	English