Firmware Pages and Descriptions
124
Modero VG Series Touch Panels - Instruction Manual
Cache Settings Page
The Cache Settings page (FIG. 123) conf igures the allocation of memory for image caching. The G4 graphics engine caches images
to decrease load time of previously viewed images. RAM caching is always enabled, and images (both static and dynamic) are
stored in the RAM cache as they are viewed. The size of RAM cache is automatically configured to take into account available
memory versus memory that may be needed by the panel later. As the RAM cache approaches its maximum size, the oldest items in
the cache may be discarded to make room for newer items. If Flash caching is enabled, dynamic images that would have been
discarded will be moved to Flash, since it is typically faster to retrieve images on Flash than across a network (although it is slower
than RAM cache). Note that since static images are already stored on Flash, they are never moved to the Flash cache, so Flash
caching applies only to dynamic images. Images in Flash cache are moved back to RAM cache the next time they are viewed. As the
Flash cache approaches its maximum size, the least recently used items may be discarded to make room for new items.
Flash memory may be allocated for image caching, but RAM cache is always enabled. Flash memory is a secondary cache and is
much slower than RAM cache, as it uses Compact Flash to store images. Flash memory should not be used frequently, but it may be
appropriate to use Flash memory in some environments that are dynamic image intensive, at times when RAM cache is easily
exhausted and the time taken to access Flash memory would be faster than network latency.
For example, when large dynamic images are being used over slow wireless links, putting the images into Flash memory can help
the situation, as the panel could spend more resources processing information rather than continuously waiting on images to
arrive from a slow network.
The elements on this page include:
FIG. 123
Cache Settings page
Cache Settings Page Elements
Back: Saves all changes and returns to the previous page.
Connection Status icon: The icon in the upper-right corner of each Setup page shows online/offline state of the panel to the
master.
• Bright red - disconnected
• Bright green - connected. Blinks when a blink message is received to dark green every 5 seconds for
half a second then go back to bright green.
• Bright yellow - panel missed a blink message from the master. It will remain yellow for 3 missed blink
messages and then turn red. It will return to green when a blink message is received.
Note: A Lock appears on the icon if the panel is connected to a secured NetLinx Master.
Image Cache Settings: Allocates Flash memory for image caching.
Flash Cache Size Press the Up and Down arrows to add and remove memory. Flash memory allocation cannot exceed the
amount of Flash memory on the panel.
Flash/RAM Cache Expires Press the Up and Down arrows to change the amount of time the images stay in cache memory. The
options are: Never, 2 Hours, 8 Hours, 1 Day, 2 Days, 5 Days
Enable: Press this button to toggle the image Flash cache option On and Off.
Clear Cache: Press this button to clear both the Flash and RAM cache of all stored images.
Image Cache Status: The status of the memory available versus in use.
RAM Max Size The maximum amount of memory available for all image caching.
RAM Current Size The memory that is currently in use for caching static and dynamic images.
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