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JANUARY 2010 - TD 220a DEPLOYMENT GUIDE, RDCP600
1.5.2
Memory Limitations –number of Cells and Pings
The RDCP 600 includes 6Mbytes of total SRAM memory. Some of this memory is used by the
operating system itself, while the remaining amount may be used for measuring purposes. The
amount of memory used is a function of the number of total cells (all columns) and the number
of pings used in the deployment configuration.
The graph below shows this memory constraint as a function of number of pings and number of
total cells.
% Memory Use
# Cells
# Pings
The colour shading is divided into 10% steps of total memory available where green is 50%,
light green is 60%, yellow is 70%, orange is 90% and red is 100%.
Any combination above the red area will cause the system to malfunction. A warning will be
given in the Deployment Configuration application if this limit is exceeded.
Looking at some examples we find that:
If the number of total cells is 150, the maximum number of pings is about 400.
If the number of total cells is 100, the maximum number of pings is 600.
Usually this memory constraint does not impose a problem in practical use. Limitations may
come in, however, when very high quality data is wanted and the number of pings is increased.
If e.g. the number of pings is increased to 800, the maximum number of cells that may be
configured is reduced to about 60.
Note! When configuring the RDCP 600 it is a good practice to stay away from the entire ‘red
zone’
.
