Dahua NVR21-4KS3 Series User Manual page 468

Questions
NVR cannot control PTZ.
I cannot log in client-end or
web.
There is only mosaic no video
when preview or playback
video file remotely.
Network connection is not
stable.
Burn error /USB back error.
Keyboard cannot control NVR.
Reasons
● Front panel PTZ error.
● PTZ decoder setup, connection or installation is not
correct.
● Cable connection is not correct.
● PTZ setup is not correct.
● PTZ decoder and NVR protocol is not compatible.
● PTZ decoder and NVR address is not compatible.
● When there are several decoders, add 120 Ohm between
the PTZ decoder A/B cables furthest end to delete the
reverberation or impedance matching. Otherwise the PTZ
control is not stable.
● The distance is too far.
● For Windows 98 or Windows ME user, update your system
to Windows 2000 sp4. Or you can install client-end
software of lower version. Please note right now, our NVR
is not compatible with Windows VISTA control.
● ActiveX control has been disabled.
● No dx8.1 or higher. Upgrade display card driver.
● Network connection error.
● Network setup error.
● Password or username is invalid.
● Client-end is not compatible with NVR program.
● Network fluency is not good.
● Client-end resources are limit.
● Current user has no right to monitor.
● Network is not stable.
● IP address conflict.
● MAC address conflict.
● PC or device network card is not good.
● Burner and NVR are in the same data cable.
● System uses too much CPU resources. Stop record first and
then begin backup.
● Data amount exceeds backup device capacity. It might
result in burner error.
● Backup device is not compatible.
● Backup device is damaged.
● NVR 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.
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User's Manual