22
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 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 decoder
a. Ensure the decoder 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 thunder 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 decoder should be less than 5v.
4. Please make sure the front-end device has soundly earthed.
Improper grounding may result in chip damage.
3.8.1 Alarm Input and Output Details
You can refer to the following sheet
X
for alarm input and output information.
Important
Please refer to the specifications for the alarm input and output channel amount. Do not merely
count the alarm input and out channel amount according to the ports on the rear panel.
Summary of Contents for DVR-H**PG
Page 1: ...DVR HxxPG PKC User s Manual...
Page 13: ...13 The 8 channel series product interface is shown as in Figure 2 18 Figure 2 18...
Page 47: ...47 Figure 4 28 Figure 4 29 Figure 4 30...
Page 55: ...55 Figure 4 46...
Page 95: ...125 Figure 5 66...
Page 100: ...130 Figure 6 11...
