Moxa Technologies 2140 - Manual (Page 78)

Quality setting Size of each frame Bandwidth demand for 30 fps
Medium 9.3 Kbyte 2246 Kbps
Standard 11.15 Kbyte 2676 Kbps
Good 13.76 Kbyte 3303 Kbps
Detailed 16.35 Kbyte 3925 Kbps
Excellent 20.3 Kbyte 4886 Kbps
Q: How can I keep Video Server as private as possible?
A: Video Server is designed for surveillance purposes and has many flexible interfaces. The user
authentication and special confirmation during installation can keep Video Server from
unauthorized access. You may also change the HTTP port to a non-public number. You can
check system log to examine any abnormal activities and trace the origins.
Q: I have a PTZ camera that is not on the support list. How can I control it?
A: Video Server provides a custom camera command interface to control cameras that are not
supported. The details are described in this manual. Be sure that the COM port settings are
applied to the camera specifications. The camera control cable included is shown in the
package contents. Prepare your own cable if necessary. The general PTZ command is
composed of one start command and one stop command. When editing both commands in the
edit box of the configuration page, use comma(s) to separate commands. Each comma
represents 200 milliseconds. If the user has some serial control device other than the PTZ
camera, the special URL is provided to send the desired commands. For quick access, integrate
the URL to another homepage on your own web server.
Q: Why can I see image files when I use dir in FTP even if the alarm is not triggered?
A: Every time Video Server starts, it will capture the images as vpre.jpg. If there are previously
saved image files that are not retrieved, Video Server will keep them until they are accessed.
Q: How will the stored images be processed if Video Server loses power?
A: If a user has defined the snapshot interval, Video Server will capture images periodically as
pre-alarm stage. Once the pre-defined condition is match, the pre-alarm images will be kept
and the current images will be saved. The subsequent images will be stored as post-alarm stage.
Users may retrieve these files either by downloading via FTP, or direct Video Server to send
them in e-mails. This means that after monitoring conditions are met, Video Server will keep
these image files until user retrieval even if power is lost.
Q: If I set Video Server to send e-mails of images whenever the conditions are met, will my e-mail
account overflow?
A: It is recommended to use transient state instead of steady state. For instance, use ‘Input is
Rising’ and ‘Input is Falling’ rather than ‘Input is High’ and ‘Input is Low’ to let the condition
be triggered only when state is changed.
Q: The image is not clear enough. Is anything broken?
A: The lens can be focused by rotating the outer ring. Rotate it clockwise or counter-clockwise to
focus near or far.
VPort 2140 User’s Manual 7-4