Campbell Scientific 223-L Delmhorst Cylindrical Soil Moisture Block - Manual (Page 15)

223 Delmhorst Cylindrical Soil Moisture Block
7.2 Programming
This section describes using CRBasic or Edlog to program the
datalogger. See Section 4.2, Use SCWin to Program Datalogger
and Generate Wiring Diagram, if using Short Cut. NOTE
Dataloggers that use CRBasic include our CR800, CR850, CR1000, CR3000,
and CR5000. Dataloggers that use Edlog include our CR10(X), 21X, CR23X,
and CR7. CRBasic and Edlog are included with LoggerNet, PC400, and
RTDAQ software.
The datalogger program needs to control the multiplexer, measure the sensor,
calculate the sensor resistance, and convert the resistance to potential in bars.
Example programs are provided in Section 7.2.5, Example Programs.
7.2.1 Control the Multiplexer
When a multiplexer is used, the measurements are placed within a loop. Each
pass through the loop, the multiplexer is clocked to the next channel and the
sensors connected to that channel are measured. The programming sequence
for using the multiplexer is shown in Section 7.2.1.1, CRBasic, and Section
7.2.1.2, Edlog. For more information, see the multiplexer manual.
7.2.1.1 CRBasic
The generalized CRBasic programming sequence follows:
ACTIVATE MULTIPLEXER/RESET INDEX
Portset (1 ,1) 'Set C1 high to Enable Multiplexer
I=0
BEGIN MEASUREMENT LOOP
SubScan (0,sec,16) 'This example measures 16 sets
CLOCK PULSE AND DELAY
Portset (2,1) ‘Set port 2 high
Delay (0,20,mSec)
Portset (2,0) ‘Set port 2 low
INCREMENT INDEX AND MEASURE
I=I+1
‘223 measurement instruction
‘Storing results in Variable(I)
END MEASUREMENT LOOP
NextSubScan
DEACTIVATE MULTIPLEXER
Portset
(1 ,0) 'Set C1 Low to disable Multiplexer
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