Vivotek IP3111/3121 - Manual (Page 88)

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A. Network Camera provides a custom camera command interface to control the cameras that are not
supported. The details are described in the manual. Be sure the COM port settings are applied to the
camera specification. The camera control cable included is shown in the package content. 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. How fast will Network Camera check the status of digital inputs?
A. Network Camera will check input status in less than half a second. However, to avoid repeatedly
checking conditions too often and to allow the devices connected to digital outputs to function properly,
Network Camera will delay 3 seconds by default after each condition matches. Users may change it
according to specific applications. During this period, any condition will be ignored.
Q. Why can I not access Network Camera when I setup some options in the application?
A. When Network Camera is triggered by events, snapshots will take more time to write them into
memory. If the events occur too often, the system will always be busy storing images. It is recommended
to use sequential mode or external recorder program to record motion pictures if the event is frequent. If
you prefer to retrieve images via FTP, the value could be smaller since FTP responses quicker than the
Web does. Once the system is too busy to configure, use the restore factory default and reset button to
save the system.
Q. I try to connect my black-and-white and color cameras with Network Camera but the image is not
good.
A. Although Network Camera allows users to choose color or black-and-white images for each camera,
hybrid camera types may increase video processing time and reduce system performance.