Visionari Limited Liability Company Visionari Copyright(1.4)2010Version
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10
8308R Series Network DVR User Manual
B. Avoid the entrance of high voltage. Make the layout reasonably. Take precaution from the thunder.
C. In the outlying end connect 120Ω resistance paralleled to reduce the inflection and insure the signal
quality.
D. The 485 AB lines of DVR can not connected with other 485 output equipments paralleled.
E. The voltage between the AB lines of the decoder must be less than 5V.
4
、
Front equipment grounding note
Bad grounding can lead to the burnout of the chip.
5
、
Alarm input type unlimited
The DVR alarm output port is constant opening type.
(1) (2)
(3) (4)
(1) alarm input 1
(2) grounding
(3) alarm output1
(4) RS485
parameter
meaning
G
grounding
C1
、
NO1
Alarm output interface(constant open type)
A
、
B
485communication interface which is connected with the recording
control equipments such as the decoder
2.6.1 Alarm input port specification
1 channels alarm input. Alarm input type unlimited.
The grounding and the com port of the alarm sensor are parallel (The alarm sensor is external power supply) .
The grounding of the alarm and the DVR should be shared.
