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15.
Network connection is not stable.
Possible reasons:
A.
Network is not stable.
B.
IP address is conflicted.
C.
MAC address is conflicted.
D.
The net card of the DVR is bad.
16.
There is something wrong with the USB backup or writing a CD.
Possible reasons:
A.
The rewritable machine and the hard disk are shared the same data
lines.
B.
There is too much data to backup. Please stop recording and backup
on another device.
C.
The backup equipment is not compatible.
D.
The backup equipment is damaged.
17.
The keyboard cannot control the DVR.
Possible reasons:
A.
The serial port of the DVR is not set correctly.
B.
The address is not correct.
C.
When multiple transformers are connected, the power supply is not
large enough. Please give each transformer individual power supply.
D.
The distance is too far.
18.
Alarm cannot be recessional.
Possible reasons:
A.
The settings for the alarm are not correct.
B.
The alarm output is turned on manually.
C.
The input machine is damaged or the connections are not correct.
D.
There are some problems for specific program edition, Please update
the program.
