Dahua Smart Box Series User Manual page 336

MAC address conflict.
PC or DVR network card is not good.
16. Burn error /USB back error.
There are following possibilities:
Burner and DVR are in the same data cable.
System uses too much CPU resources. Please stop record first and then begin
backup.
Data amount exceeds backup device capacity. It may result in burner error.
Backup device is not compatible.
Backup device is damaged.
17. Keyboard can not control DVR.
There are following possibilities:
DVR serial port setup is not correct
Address is not correct
When there are several switchers, power supply is not enough.
Transmission distance is too far.
18. Alarm signal can not been disarmed.
There are following possibilities:
Alarm setup is not correct.
Alarm output has been open manually.
Input device error or connection is not correct.
Some program versions may have this problem. Please upgrade your system.
19. Alarm function is null.
There are following possibilities:
Alarm setup is not correct.
Alarm cable connection is not correct.
Alarm input signal is not correct.
There are two loops connect to one alarm device.
20. Remote control does not work.
There are following possibilities:
Remote control address is not correct.
Distance is too far or control angle is too small.
Remote control battery power is low.
Remote control is damaged or DVR front panel is damaged.
21. Record storage period is not enough.
There are following possibilities:
Standalone DVR User's Manual
326