Campbell Scientific CR200/CR200X-series Dataloggers - Manual (Page 84)

Section 9. Programming
9.5 Structure
TABLE. CRBASIC Program Structure (p. 72) delineates CRBASIC program
structure:
Table 6. CRBASIC Program Structure
Declarations Define datalogger memory usage. Declare constants,
variables, aliases, units, and data tables.
Declare constants List fixed constants
Declare Public variables List / dimension variables viewable during program
execution
Dimension variables List / dimension variables not viewable during program
execution.
Define Aliases Assign aliases to variables.
Define Units Assign engineering units to variable (optional). Units
are strictly for documentation. The CR200(X) makes no
use of Units nor checks Unit accuracy.
Define data tables. Define stored data tables
Process/store trigger Set triggers when data should be stored. Triggers may
be a fixed interval, a condition, or both.
Table size Set the size of a data table
Processing of Data List data to be stored in the data table, e.g. samples,
averages, maxima, minima, etc.
Processes or calculations repeated during program
execution can be packaged in a subroutine and called
when needed rather than repeating the code each time.
Begin Program Begin Program defines the beginning of statements
defining datalogger actions.
Set scan interval The scan sets the interval for a series of measurements
Measurements Enter measurements to make
Processing Enter any additional processing
Call Data Table(s) Declared data tables must be called to process and
store data
Initiate controls Check measurements and initiate controls if necessary
NextScan Loop back to Set Scan and wait for the next scan
End Program End Program defines the ending of statements defining
datalogger actions.
CRBASIC EXAMPLE. Proper Program Structure (p. 73) demonstrates the
proper structure of a CRBASIC program.
72