Alarm input: for D1/HD1series, 5~15v is needed for voltage alarm input. For CIF
series, grounding signal is needed for alarm input.
If you need to connect two DVRs or one DVR and other device, please use relay
to separate them.
2.4.2 Alarm
Output
Do not connect alarm output port directly with high power load (no more than 1 A) in
case of heavy current which will destroy the relay. You can use the co-contactor to
realize the connection between the alarm output port and the load.
2.4.3 How to Connect PTZ Decoder
Ensure the decoder has the same grounding with DVR; otherwise possible
common mode voltage may fail to control the PTZ. Shielded twisted wire is
recommended and the shielded layer is used to connect to the grounding.
Avoid the entry of high voltage. Ensure proper wiring and some thunder
protection measures
For 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.
“485 A, B” of DVR cannot parallel connect with “485 port” of other device.
The voltage between A,B lines of the decoder should be less than 5v.
2.4.4 About
Grounding
Poor grounding of the front-end devices may cause damage to chips.
There are two alarm input types: normal open or normal close.
Terminal
Screw
Figure 2-1
Parameter
Grounding alarm
Ground
Ground line
+12v
Ex12V power supply needed
OUT 12
Two alarm output ports. Normal open type.
485 AB
485 communication port. They are used to control devices such as
decoder.
+12C
Please shut down power to turn off alarm.
ALARMIN
ALARMIN 1-4 is alarm input. It is active in low voltage.
15
