Axis Communications 232d+ user manual Pre-trigger and Post-trigger buffers

AXIS 231D+/232D+ - Event Configuration 31

Pre-trigger and Post-trigger buffers

This function is useful for checking what happened immediately before and after a trigger - for example, 10 seconds before and after a door has been opened.

Go to Event Types > Add Triggered... > When Triggered... and check the Upload images checkbox to expand the web page with the available options.

Buffer size - up to 9 MB buffer. The maximum length of time of the pre-/post-buffer depends on the image size and selected frame rate.

Include pre-trigger buffer - images stored internally in the server from the time immediately preceding the trigger. Check the box to enable the pre-trigger buffer, enter the desired length of time and specify the required image frequency.

Include post-trigger buffer - contains images from the time immediately after the trigger. Configure as for pre-trigger.

Notes: If the pre- or post-buffer is too large for the internal memory, the frame rate is reduced and individual images may be missing. If this occurs, an entry is created in the unit's log file.

Pre-trigger and Post-trigger buffers are lost if the connection to the event server fails.

Continue image upload (unbuffered) - enable the upload of images for a fixed length of time. Specify the length of time for the uploaded recording, in seconds, minutes or hours, or for as long as the trigger is active. Finally, set the desired image frequency to the maximum (the maximum available) or to a specified frame rate. The frame rate will be the best possible, but might not be as high as specified, especially if uploading via a slow connection.