User's Manual

GVR3550/GVR3552 User Manual Page 27 of 125
Figure 8 Alarm Device Connection Diagram
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:
Ø When power the alarm input device with an external power supply, the device
should be common-grounded with GVR3550.
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