Campbell Scientific CR5000 Measurement and Control Module - Manual (Page 80)

Section 4. CRBasic - Native Language Programming
4-4
4.3 Example Program
Const RevDiff=1
Const Del=0 'default
Const Integ=250
Const Mult=1
Const Offset=0
Public RefTemp
Public TC(6)
Units RefTemp=degC
Units TC=DegC
DataTable (Temp,1,2000)
DataInterval (0,100,mSec,10)
Average (1,RefTemp,FP2,0)
Average (6,TC(),FP2,0)
EndTable
BeginProg
Scan (10,mSec,3,0)
PanelTemp (RefTemp, 250)
TCDiff (TC(),6,mV20C ,1,TypeT,RefTemp,RevDiff,Del,Integ,Mult,Offset)
CallTable Temp
NextScan
EndProg
4.3.1 Data Tables
Data storage follows a fixed structure in the CR5000 in order to optimize the
time and space required. Data are stored in tables such as:
TOA4 StnName Temp
TIMESTAMP RECORD RefTemp_Avg TC_Avg(1) TC_Avg(2) TC_Avg(3) TC_Avg(4) TC_Avg(5) TC_Avg(6)
TS RN degC degC degC degC degC degC degC
Avg Avg Avg Avg Avg Avg Avg
1995-02-16 15:15:04.61 278822 31.08 24.23 25.12 26.8 24.14 24.47 23.76
1995-02-16 15:15:04.62 278823 31.07 24.23 25.13 26.82 24.15 24.45 23.8
1995-02-16 15:15:04.63 278824 31.07 24.2 25.09 26.8 24.11 24.45 23.75
1995-02-16 15:15:04.64 278825 31.07 24.21 25.1 26.77 24.13 24.39 23.76
The user's program determines the values that are output and their sequence.
The CR5000 automatically assigns names to each field in the data table. In the
above table, TIMESTAMP, RECORD, RefTemp_Avg, and TC_Avg(1) are
fieldnames. The fieldnames are a combination of the variable name (or alias if
one exists) and a three letter mnemonic for the processing instruction that
outputs the data. Alternatively, the FieldNames instruction can be used to
override the default names.
The data table header also has a row that lists units for the output values. The
units must be declared for the CR5000 to fill this row out (e.g., Units RefTemp
Declare public variables ,
dimension array, and
declare units.
Declare constants
Define Data Table
Declarations
Scan loop
Measure
Call Data Table