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loop it must prevent the big current from relay damage. Use the contact isolator when there is a
high-power load
３、
PTZ decoder connections ( Option )
A. The grounding of the PTZ decoder and DVR must be shared otherwise the common-mode
voltage will lead to the PTZ control failure. The shielded twisted pair is recommended.
B. Avoid the entrance of high voltage. Make the layout reasonably. Take precaution from the
thunder.
C. In the outlying end connect 120
Ω
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) alarm input (2) grounding (3) RS232 (4) alarm output (5) RS485
parameter meaning
G grounding
C1
、
NO1
Alarm output interface(constant open type)
