Q & A - Vision VHD-400 Series User Manual

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Q & A
4.
1. There is nothing displayed on the monitor though electric power is supplied to DVR.
1) Please check if the power is supplied properly. When the power is supplied, you can
hear the noise from FAN and HDD operation.
2) Please check the cable connection with the DVR. Remove all the cable connections,
except for the monitor cable, and then apply power to the DVR again and check booting
status.
3) In case that the display screen is stopped at logo screen, please contact your dealer or
distributor.
2. Is it necessary to open the port when using DDNS (cctv-link.net, dyndns.org)?
Yes, it is.
DDNS is the function to let remote software acknowledge the changed address of the DVR
(dynamic IP provided by ISP) or to allow connection to the DVR by sub domain (sub
domain.cctv-link.net) without memorizing IP.
3. Remote software connection to the DVR works fine but WEB connection doesn't work.
1) Some ISP blocks port number 80. Please try again after changing WEB port.
(8080 or 8088 is recommended.)
2) Please check whether the WEB port is opened or not.
4. Image is not shown after login at WEB monitoring
1) TCP port and UDP port should be opened. Default of TCP/UDP port is 9020/9021.
2) Please check if Active-X is installed. In order to monitor image, Active-X is required.
5. DVR doesn't record images in sensor mode and/or motion mode.
1) It records images only when there is an event for the corresponding mode.
2) Please check if the setting is correctly done at the menu of [Device > Sensor] and
[Device > Motion].
6. Backup or firmware upgrade through USB memory stick cannot be made though it is
detected by the DVR.
1) USB memory stick should be formatted by FAT or FAT 32.
2) It is not allowed to use the partitioned and/or password-encoded USB memory
7. Time sync through NTP server doesn't work.
NTP server requires DNS server address. Please check if DNS server address is correct
at [Network] tab.
8. E-mail transmission doesn't work in using E-mail notify function.
1) E-mail notify function works based on SMTP service.
Please check if the sending mail address is correct and if the mail server supports
SMTP service.
2) SMTP service is provided based on DNS. Please check if the DNS server address is
correct at [Network] tab.