Eyemax DVS-9030 Manual page 26

[Data Retain]
It is a function that retains data only for the period set. For example, if 10 days is set,
Eyemax will delete all previous data before 10 days regardless of the capacity
remaining in HDD.
How to Set up:
Click on "Advanced"
Tick the "Use Data Retain".
Click on "Detail" to select a day period to retain
Note: Warning message to inform as above will be appeared. To continue, click on "Yes"
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[ EyeMax ]
[PTZ Camera Setup]
When using a PTZ camera, check the box and select a model name. Eyemax DVR
system supports nearly 40 different protocols.
Camera ID:
Leave it as it is if only one PTZ camera is used. Otherwise, give each
camera a different number.
Restore as Previous:
Tick the box and set time period to move camera back to initial position
after a certain period of time.
Apply All:
The same settings will be applied to the rest of the cameras by clicking on "Apply All".
Select the port used for PTZ camera.
Bit per Second:
It is 9600 for most of PTZ cameras.
But a few can have different values.
Refer to camera manual.
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User's Manual ( 5.1.0.0 )