26
3.7
Connecting Audio Input & Audio Output, Alarm Input &Alarm Output,
RS232/RS485 and Other Interfaces
3.7.1 Audio Input/Audio Output
The DVR encodes audio and video signals simultaneously, which lets you control
audio at the monitored location.
To set up audio:
1. Make sure your audio input device matches the RCA input level. If the device and
RCA input levels do not match, audio distortion problems may occur.
2. Make sure the audio connector is wired as follows:
3. Connect a line input device or pre-amplified microphone to the audio connector for
the video channel on the rear panel.
Please refer to Figure 3-3.
Figure 3-3
3.7.2 Alarm Input and Relay Output
The DVR offers 4-ch alarm input for external signaling devices, such as door contacts
or motion detectors. Each alarm input can be either normally open or normally closed.
Once configured, an alarm input can invoke many different activities, including
triggering a relay device, sending an alert to a security office or storing pre-alarm
video to the DVR.
3.7.3 Alarm Input
You should check your alarm input mode is grounding alarm input or not.
For this series DVR, grounding signal is needed for alarm input.
If you need to connect two units or one DVR and other device, please use relay to
separate them.
Please refer to Figure 3-4 for more information.
Summary of Contents for DVR-475EL
Page 1: ...1 DVR 475EL Standalone DVR User s Manual...
Page 18: ...18 Figure 2 5 2 3 Remote Control The remote control interface is shown as in Figure 2 6...
Page 32: ...32 Figure 3 12...
Page 85: ...85 Figure 6 11...
Page 109: ...109 Figure 7 39 Figure 7 40 Figure 7 41...
Page 121: ...121...
Page 125: ...125 Figure 8 5 Add device Add organization structure...
