Specifications

Section 9. CR1000 Programming
9-4
9.5 Structure
TABLE 9.5-1 delineates CRBASIC program structure:
TABLE 9.5-1. 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
CR1000 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
Other on-line storage
devices
Send data to a CF card if available
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.