Campbell Scientific CR800 and CR850 Measurement and Control Systems - Manual (Page 186)

Section 7. Installation
186
CRBasic Example 36. SDI‐12 Sensor Setup
Public PTemp, batt_volt
Public Source(10)
BeginProg
Scan (5,Sec,0,0)
PanelTemp (PTemp,250)
Battery (batt_volt)
Source(1) = PTemp 'temperature, deg C
Source(2) = batt_volt 'primary power, Vdc
Source(3) = PTemp * 1.8 + 32 'temperature, deg F
Source(4) = batt_volt 'primary power, Vdc
Source(5) = PTemp 'temperature, deg C
Source(6) = batt_volt * 1000 'primary power, mVdc
Source(7) = PTemp * 1.8 + 32 'temperature in deg F
Source(8) = batt_volt * 1000 'primary power, mVdc
Source(9) = Status.SerialNumber 'serial number
Source(10) = Status.LithiumBattery 'data backup battery, V
NextScan
SlowSequence
Do
SDI12SensorSetup (2,1,0,1)
Delay (1,500,mSec)
SDI12SensorResponse (Source)
Loop
EndSequence
EndProg
Table 27. SDI-12 Sensor Setup -- Results
Measurement
Command from
SDI-12 Recorder
Source Variables
Accessed from the
CR800 acting as a
SDI-12 Sensor
Contents of
Source Variables
0M! Source(1), Source(2) temperature °C, battery voltage
0M0! Same as 0M!
0M1! Source(3), Source(4) temperature °F, battery voltage
0M2! Source(5), Source(6) temperature °C, battery mV
0M3! Source(7), Source(8) temperature °F, battery mV
0M4! Source(9), Source(10)
serial number, lithium battery
voltage
7.8.3.3 SDI-12 Power Considerations
When a command is sent by the CR800 to an SDI-12 probe, all probes on the
same SDI-12 port will wake up. However, only the probe addressed by the
datalogger will respond. All other probes will remain active until the timeout
period expires.