Campbell-scientific OBS500 Smart Turbidity Meter with ClearSensor Tech Bedienungsanleitung Seite 29
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OBS500 Smart Turbidity Meter with ClearSensor™ Technology
7.4 Communication Modes
7.4.1 SDI-12
The OBS500 uses an SDI-12-compatible hardware interface and supports a
subset of the SDI-12 commands. The most commonly used command is the
aM! command, issued by the datalogger. Here, a represents the sensor address
(0 to 9). The communication sequence begins with the datalogger waking the
sensor and issuing the aM! command. The sensor responds to the datalogger
indicating that two measurements will be ready within two (2) seconds.
Subsequent communications handle data reporting from the sensor to the
datalogger.
The SDI-12 protocol has the ability to support various measurement
commands. The OBS500 supports the commands that are listed in the TABLE
7-7.
TABLE 7-7. SDI-12 and RS-232 Measurement Commands
Commands
Process
Values Returned
aM!
aC!
a = address
Open Wiper
Measure
Close
Send Data
obs (tu)
ss (tu )
temperature (degc)
wet dry (0=dry 1=wet)
aM1!
aC1!
Open Wiper
Measure
Close
Send Data
ratio (tu)
temperature (degc)
wet dry (0=dry 1=wet)
aM2!
aC2!
Open Wiper
Measure
Close
Send Data
obs (tu)
ss (tu )
ratio (tu)
temperature (degc)
raw obs (volts)
raw ss (volts)
open current (ma)
close current (ma)
wet dry (0=dry 1=wet)
aM3!
aC3!
Open Wiper
Send Data
open wiper position count
open max current count
open timeout count
open current (ma)
aM4!
aC4!
Measure
Send Data
obs (tu)
ss (tu )
temperature (degc)
wet dry (0=dry 1=wet)
aM5!
aC5!
Measure
Send Data
ratio (tu)
temperature (degc)
wet dry (0=dry 1=wet)
aM6!
aC6!
Measure
Send Data
obs (tu)
ss (tu )
ratio (tu)
temperature (degc)
raw obs (volts)
raw ss (volts)
open current (ma)
close current (ma)
wet dry (0=dry 1=wet)
19
- OPERATOR’S MANUAL 1
- Limited Warranty 3
- Assistance 4
- Precautions 5
- Table of Contents 10
- OBS500 Smart Turbidity Meter 11
- 3. Initial Inspection 12
- 4. Quickstart 12
- 5. Overview 18
- 5.1 Applications 19
- 5.2 Turbidity Units 19
- 5.3 Measurement Details 20
- to 170° 21
- 6. Specifications 22
- 7. Installation 23
- 7.3.1 SDI-12 Wiring 27
- 7.3.2 RS-232 Wiring 28
- 7.4 Communication Modes 29
- 7.5 Calibration 32
- Turbidity (NTU) 33
- 7.5.2 Sediment 36
- 7.6 Programming 39
- Sediment Measurements 43
- 8.3 Particle-Shape Effects 44
- Scattering Angle 45
- 8.6 Water Color 47
- 8.7 Bubbles and Plankton 47
- 9. Maintenance 48
- 10. Troubleshooting 49
- 11. References 51
- A.1.1 CRBasic Datalogger 53
- A.1.2 Edlog 54
- B.1 CR1000 SDI-12 Program 55
- B.2 CR1000 RS-232 Program 56
- B.3 CR1000 Analog Program 57
- Program 59
- Installation 61
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