Pre-alarm and Post-alarm Recording
The camera can record images from the point immediately preceding an alarm (pre-alarm recording) and images that occur after the alarm is received (post-alarm recording).
The alarm data for a single pre- and post-alarm event can be recorded in the camera’s internal memory. The ratio between the spaces available for pre-alarm and post-alarm recording can be set using the BUFFERING AREA command in the ALARM SET menu. The default setting is “0” for pre-alarm recording and “10” for post-alarm recording. In this case, the COMPRESSION RATIO and RESOLUTION setting values for images in the live image screen can be changed regardless of the alarm settings. (Figure 1)
However, if the BUFFERING AREA settings are changed so that the PRE/POST ratio is 0/10 to 1/9 or something greater than this (so that pre-alarm recording is carried out), the [PRIORITY] and [ALARM RESOLUTION] settings will be displayed in the set positions on the live image screen. In this case, the setting values are fixed, and so they cannot be changed using the drop-down list box. The [IMAGE MODE] setting at this time will also be fixed at “COLOR”. (Figure 2)
In addition, if [PRIORITY] is set to “PICTURE QUALITY”, the compression ratio setting in the live image screen will be “STEP5”, and if it is set to “TIME”, then “STEP2” will be fixed.
Note: When the alarm recording capacity is filled, pre-alarm recording is canceled. Accordingly, the setting for the drop-down list box in the live image screen will no longer be fixed.
