IC Realtime Specialty: Interrogator DVR - a DVR for law enforcement - Manual (Page 22)

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Audio input, bidirectional audio input and audio output
The DVR encodes audio and video signals simultaneously, which lets you control audio
at the monitored location.
The audio input adopts BNS port connection. The audio output signal is Line Out, 2Vpp
4Ω(BNC or RCA). It can connect to earphone (low resistance), sound box or use
amplifier to driver other audio output device.
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 alarm inputs 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 a relay to
separate them.
Please refer to Figure 3-4 for more information.