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15
3.5.2 Audio Output
The audio output signal parameter is usually over 200mv
1KΩ (BNC). It can directly connect to a 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.
3.6 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 the alarm input mode is grounded 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
To avoid high current, which may result in relay damage, the alarm output port should not be
connected to high power load directly (It should be less than 1Amp). Please use the co-contactor to
make sure there is a connection between the alarm output port and the load.
3. How to connect PTZ decoder
a. Ensure the decoder has the same grounding as the 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 surge protection measures.
c. For signal wires that are too long
, 120Ω should be parallelly connected between A, B lines on the
far end to reduce reflection and to guarantee signal quality.
d.
“485 A, B” of DVR cannot parallelly connect with a “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 been soundly earthed.
Improper grounding may result in circuit damage.
Summary of Contents for I-ZEUS-HYBRID1
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