Campbell Scientific OBS500 Smart Turbidity Meter with ClearSensor Technology - Manual (Page 39)

OBS500 Smart Turbidity Meter with ClearSensor™ Technology
10. Perform 3 rd order polynomial regressions on the data to get the coefficients
for converting OBS output to SSC.
7.6 Programming
7.6.1 Using SCWIN
SCWIN is the easiest and, typically, the preferred method for programming the
datalogger. SCWIN generates a wiring diagram that shows how to connect the
OBS500 to your Campbell Scientific datalogger.
The sections that immediately follow are for CRBasic and Edlog.
SCWIN users can jump ahead to Section 9, Maintenance.
7.6.2 CRBasic Programming
Dataloggers that use CRBasic include our CR200X-series, CR800, CR850,
CR1000, CR3000, and CR5000 dataloggers.
7.6.2.1 SDI-12
The SDI12Recorder instruction is used to read the OBS500 in SDI-12 mode.
A multiplier of 1.0 and an offset of 0.0 yield water level in psig and
temperature in degrees C.
The SDI12Recorder instruction has the following form:
SDI12Recorder(Destination, Output String, Multiplier, Offset)
Refer to Appendix B.1, CR1000 SDI-12 Program, for an example of using this
CRBasic instruction.
7.6.2.2 RS-232
The SerialOut() instruction sends strings over the Tx COM port and the
SerialIn() instruction receives strings from the Rx COM port.
Refer to Appendix B.2, CR1000 RS-232 Program, for an example of using
these CRBasic instructions.
7.6.2.3 Analog
The PortSet instruction is used to open the shutter. Either the VoltDiff
(recommended) or VoltSe instruction is used to measure the analog voltage
output.
Refer to Appendix B.2, CR1000 RS-232 Program, for an example of using
these CRBasic instructions.
7.6.3 Edlog Programming
Our CR500, CR510, CR10(X), and CR23X dataloggers are programmed with
Edlog.
These dataloggers use Instruction 105 (SDI12Recorder) to read the OBS500.
Your datalogger manual has a detailed explanation of Instruction 105.
NOTE
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