Campbell CR800 Series, Operator'S Manual

Page: 250 / 598

Section 7. Installation
250
Note When only one SDI-12 sensor is attached, that is, multiple sensor
measurements do not need to start concurrently, another reliable method
for making SDI-12 measurements without affecting the main scan is to use
the CRBasic SlowSequence instruction and the SDI-12 M! command.
The main scan will continue to run during the
ttt
time returned by the SDI-
12 sensor. The trick is to synchronize the returned SDI-12 values with
the main scan.
aCv
Start alternate concurrent measurement.
Syntax:
aCv
Using SDI12Sensor() to Test Cv Command
'This program example demonstrates how to use CRBasic to simulate four SDI-12 sensors. This
program can be used to
'produce measurements to test the CRBasic example Using Alternate Concurrent Command (aC)
(p.
251).
Public Temp(4)
DataTable (Temp,True,0)
DataInterval (0,5,Min,10)
Sample (4,Temp(),FP2)
EndTable
BeginProg
Scan (5,Sec,0,0)
PanelTemp (Temp(1),250) 'Measure CR800 wiring panel temperature to use as base for
'simulated temperatures Temp(2), Temp(3), and Temp(4).
Temp(2) = Temp(1) + 5
Temp(3) = Temp(1) + 10
Temp(4) = Temp(1) + 15
CallTable Temp
NextScan
SlowSequence
Do
'Note SDI12SensorSetup / SDI12SensorResponse must be renewed
'after each successful SDI12Recorder() poll.
SDI12SensorSetup (1,1,0,95)
Delay (1,95,Sec)
SDI12SensorResponse (Temp(1))
Loop
EndSequence