External Intercom Device; Figure 9 Alarm Device Connection Diagram - Grandstream Networks GVR3552 User Manual

You need an external power source when connecting to an output device.

Prepare a DC12V external voltage when need external DC power supply.

Prepare an external relays when need external AC power supply, or it may destroy the device and there
might be a potential security liability.
NOTE
:


EXTERNAL INTERCOM DEVICE

GVR3550/GVR3552 supports web paging and local paging.
1. Connect the audio-input device like microphone or pickups with RCA interface to the audio input
interface on the back panel of GVR;
2. Connect the audio-output device like speaker or stereo with RCA interface to the audio output interface
on the back panel of GVR.
(The steps above ensure the GVR3550/GVR3552 could input or output audio);
3. Connect the microphone to PC audio input interface, while the earphone or stereo is being connected to
PC audio output interface to make PC input/output audio.
GVR3550/GVR3552 User Manual

Figure 9 Alarm Device Connection Diagram

When power the alarm input device with an external power supply, the device
should be common-grounded with GVR3550.
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