Campbell CR6 Series, Руководство оператора

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Section 7. Installation
269
The usual method for writing high-frequency time series data to memory cards,
especially in high-speed measurement applications, is to use the TableFile()
instruction with Option 64 . It supports 16 GB or smaller memory cards and
permits smaller and variable file sizes.
7.7.10.1 TableFile() with Option 64
Option 64
has been added as a format option for the CRBasic instruction
TableFile() . It combines the speed and efficiency of the CardOut() instruction
with the flexibility of the TableFile() instruction. Memory cards
1
up to 16 GB
are supported. TableFile() with Option 64 , TOB3 is now available in CR6
operating systems 25 or greater. TableFile() is a CRBasic instruction that creates
a file from a data table in datalogger CPU memory.
Option 64
directs that the
file be written in TOB3 format exclusively to the CRD: drive
2
.
Syntax for the
TableFile()
instruction is as follows:
TableFile (FileName, Option, MaxFiles, NumRecs/
TimeIntoInterval, Interval, Units, OutStat, LastFileName)
where Option is given the argument of 64 . Refer to CRBasic Editor Help
3
for a
detailed description of each parameter.
Note
The CRD: drive (the drive designation for the optional memory
card) is the only drive that is allowed for use with Option 64 .
Note Memory cards add a measure of security in guarding against data
loss. However, no system is infallible. Finding a functioning memory
card in the mud after a moose has trampled your weather station or a
tractor has run an offset disk over your soil-moisture station may be
difficult. The best rule is to collect data from the CR6 only as often as you
can afford to lose the data. In other words, if you can afford to lose a
months worth of data, you can afford to collect the data only once a
month.
1
Memory cards for the CR6 are the micro SD type.
2
The CRD: drive is a memory drive created when a memory card is inserted into the CR6.
3
CRBasic Editor is included in Campbell Scientific datalogger support software
(p. 97)
suites
LoggerNet , PC400 , and RTDAQ .
7.7.10.2 TableFile() with Option 64 Replaces CardOut()
TableFile() with Option 64 has several advantages over CardOut() when used in
most applications. These include:
•
Allowing multiple small files to be written from the same data table so
that storage for a single table can exceed 2 GB.
TableFile()
controls the
size of its output files through the NumRecs , TimeIntoInterval , and
Interval parameters.
•
Faster compile times when small file sizes are specified.