HDCVR
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2.5
Connecting Audio Input & Output, Bidirectional Audio
2.5.1
Audio Input
These series products audio input port adopt BNC port.
Due to high impedance of audio input, please use active sound pick-up.
Audio transmission is similar to video transmission. Try to avoid interference, dry joint, loose contact
andit shall be away from high tension current.
2.5.2
Audio Output
The audio output signal parameter is usually over 200mv 1KΩ (BNC or RCA). It can directly connect to
low impedance earphone, active sound box or amplifier-drive audio output device.
If the sound box and the pick-up cannot be separated spatially, it is easy to arouse squeaking. In this
case you can adopt the following measures:
Use better sound pick-up with better directing property
Reduce the volume of the sound box.
Using more sound-absorbing materials in decoration can reduce voice echo and improve
acousticsEnvironment.
Adjust the layout to reduce happening of the squeaking.
2.6
RS485
When the DVR receives a camera control command, it transmits that command up the coaxial cable
to the
PTZ device. RS485 is a single-
direction protocol; the PTZ device can’t return any data to the unit. To
enable
X289 H289H289H X
Since RS485 is disabled by default for each camera, you must enable the PTZ settings first. This
series
DVRs support multiple protocols such as Pelco-D, Pelco-P.
To connect PTZ devices to the DVR:
1. Connect RS485 A,B on the DVR rear panel.
2. Connect the other end of the cable to the proper pins in the connector on the camera.
3. Please follow the instructions to configure a camera to enable each PTZ device on the DVR.
