Campbell Scientific CR10 CR10 Measurement and Control - Page 47

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SECTION 2. INTERNAL DATA STORAGE 2.1 FINAL STORAGE AREAS, OUTPUT ARRAYS, AND MEMORY POINTERS Final Storage is that portion of memory where final processed data are stored. lt is from Final Storage that data is transferred to your computer or external storage periphera,. The size of Final Storage is expressed in terms of memory locations or bytes. A low resolution data point (4 decimalcharacters) occupies one memory location (2 bytes), whereas a high resolution data point (5 decimalcharacters) requires two memory locations (4 bytes). Table 1.5-1 shows the default allocation of memory locations to Input, Intermediate, and the two Final Storage areas. The *A Mode is used to reallocate memory or erase Final Storage (Section 1.5). The default size of Final Storage is 64K bytes or 299081ow resolution memory locations. One RAM chip is dedicated to FinalStorage. This chip has 32K bytes. A minimum of 32K bytes (16K memory locations) is ALWAYS retained in FinalStorage. Final Storage can be divided into two parts: Final Storage Area 1 and Final Storage Area 2. f/i

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SECTION
2.
INTERNAL
DATA STORAGE
2.1
FINAL STORAGE AREAS,
OUTPUT
ARRAYS, AND
MEMORY POINTERS
Final
Storage
is
that portion
of
memory where
final
processed data are
stored.
lt
is
from
Final
Storage that
data
is
transferred to
your
computer or external
storage
periphera,.
The
size
of
Final
Storage
is
expressed
in
terms
of
memory locations
or
bytes.
A
low resolution data
point
(4
decimalcharacters)
occupies one
memory location (2 bytes), whereas
a
high
resolution
data point
(5
decimalcharacters)
requires
two
memory locations (4
bytes).
Table
1.5-1 shows the default allocation of memory
locations
to
Input, Intermediate, and the
two
Final
Storage
areas.
The
*A
Mode is used
to
reallocate
memory or
erase
Final Storage
(Section
1.5).
The default size
of
Final Storage
is
64K
bytes
or
299081ow resolution memory
locations.
One
RAM
chip
is
dedicated
to
FinalStorage.
This
chip has
32K
bytes.
A
minimum of 32K bytes
(16K memory
locations)
is
ALWAYS
retained
in
FinalStorage.
Final Storage can be
divided
into
two
parts:
Final Storage
Area
1
and
Final Storage Area
2.
Locotion
Moximum
No.1
locotion
No.
Final Storage
Area
1 is
the default storage area
and
the
only one used
if
the operator
does
not
specifically allocate memory to Area
2.
A
minimum of 768 memory locations
will
ALWAYS be
retained
in
Final
Storage
Area
1.
Two
Final Storage
Areas
may
be
used to:
1.
Output different data to ditferent devices.
2.
Separate
archive
data
from
realtime
display
data.
In
other words, you
can
record a short
time
history
of
realtime
data and separately
record long
term,
archive data.
3.
Record
both
high speed
data
(fast recording
interual) and slow data
without
having
the
high speed data write over
the
slow data.
Each
FinalStorage
Area
can be
represented as
ring memory (Figure
2.1-11on
which
the
newest
data are written over
the
oldest data.
The
Data Storage Pointer (DSP) is used
to
determine where to store
each
new
data
point
in
the
Final Storage
area.
The
DSP advances to
the
next available memory location after each
new data point is stored.
$:
Y
:
I
-
DSP
Output orroy stort
morker
fiqo*AGEi
/<v"
\
{
tL
o
2.,
f.,,,
N&ro
FIGURE
2.1-1.
Ring
Memory
Representation
of
Final
Data
Storage
2-1