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G-Link-200-OEM
USER MANUAL
Given a sample with a timestamp of
t
and a derived period of
p
, the timestamp of the derived
window it belongs to is defined below.
Burst Mode
- when the node is bursting, the window covers the entire burst instead of the
derived rate. Given a sample with a timestamp of
t
, a burst period of
p
, and a burst duration of
d, the timestamp of the derived window it belongs to is defined below.
Figure 18. Derived Data Window
NOTE
A window must contain at least 32 samples. For continuous this means that the derived period
must be at least 32 times as long as the sample period. Burst is not limited by this restriction
because the minimum burst size is 100 samples.
5.4.2 Chunks
Windows can encompass thousands of samples, but a node can only operate on a finite
number of samples at a time, so the node chunks up data to run derived calculations.
Chunk size is defined below where
p
is the derived period,
d
is the burst duration, and is the
maximum chunk size. Maximum chunk size can change between nodes depending on how
many resources are available for derived calculations. The G-Link-200-OEM has a max chunk
size of 256 samples.
Continuous -
Schunk = min(p, Smax)
Burst -
Schunk = min(d, Smax)
Figure 19. Derived Data Chunks
