36
3.7
3.7
3.7
3.7
C
C
C
Connecting
onnecting
onnecting
onnecting Audio Input
Audio Input
Audio Input
Audio Input &
&
&
& Output
Output
Output
Output, Bidirectional Audio
, Bidirectional Audio
, Bidirectional Audio
, Bidirectional Audio
3.7.1 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 and it shall be away from high tension current.
3.7.2 Audio Output
The audio output signal parameter is usually over 200mv 1K
Ω
(BNC). 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
acoustics environment.
Adjust the layout to reduce happening of the squeaking.
3.8
3.8
3.8
3.8
Alarm Input and Output Connection
Alarm Input and Output Connection
Alarm Input and Output Connection
Alarm Input and Output Connection
Please refer to the following sheet for alarm input and output connection.
There are two alarm input types for you to select: normal open (NO) and normal close (NC).
1. Alarm input
a. Please make sure alarm input mode is grounding alarm input.
b. Grounding signal is needed for alarm input.
c. Alarm input needs the low level voltage signal.
d. Alarm input mode can be either NC (normal Open) or NO (Normal Close)
e. When you are connecting two DVRs or you are connecting one DVR and one other device,
please use a relay to separate them,
2. Alarm output
The alarm output port should not be connected to high power load directly (It shall be less than
1A) to avoid high current which may result in relay damage. Please use the co contactor to
realize the connection between the alarm output port and the load.
3. How to connect PTZ receiver/driver
a. Ensure the receiver/driver has the same grounding with DVR, otherwise you may not control
the PTZ. Shielded twisted wire is recommended and the shielded layer is used to connect to the
grounding.
b. Avoid high voltage. Ensure proper wiring and some Lightning protection measures.
c. For too long signal wires, 120
Ω
should be parallel connected between A, B lines on the far end
to reduce reflection and guarantee the signal quality.
d. “485 A, B” of DVR cannot parallel connect with “485 port” of other device.
e. The voltage between of A,B lines of the receiver/driver should be less than 5v.
Summary of Contents for DLA3800
Page 51: ...41 1U series 1 5U Series...
Page 52: ...42 2U Series Figure 3 6...
Page 74: ...64 Figure 4 26 Figure 4 27 Figure 4 28...
Page 79: ...69 Figure 4 33 Figure 4 34 Figure 4 35...
Page 87: ...77 Figure 4 51...
Page 91: ...81 Figure 5 3 Figure 5 4 Figure 5 5 Figure 5 6...
Page 99: ...89 Figure 5 16 Figure 5 17 Figure 5 18...
Page 142: ...132 Figure 6 11...
