SDI-12 measurements

The SoilVue 10 responds to the SDI-12 commands shown in SoilVue 10 SDI-12 commands. Because of the delays the M! command requires, Campbell Scientific recommends measurement scans of at least 10 seconds per sensor. For instance, the recommended scan rate for a 0.5‑m probe with six sensors is at least 60 seconds. A C! command does not require the data logger to pause its operation until the values are ready.

SoilVue 10 SDI-12 commands
SDI-12 command2	Values returned (units) or function	Units
aM!	1. Volumetric water content, 5 cm (m3/m3) 2. Volumetric water content, 10 cm (m3/m3) 3. Volumetric water content, 20 cm (m3/m3) 4. Volumetric water content, 30 cm (m3/m3) 5. Volumetric water content, 40 cm (m3/m3) 6. Volumetric water content, 50 cm (m3/m3) 7. Volumetric water content, 60 cm (m3/m3)1 8. Volumetric water content, 75 cm (m3/m3)1 9. Volumetric water content, 100 cm (m3/m3)1
aM1! or aC1!	1. Volumetric water content, 5 cm (m3/m3) 2. Relative permittivity (ɛ), 5 cm 3. Temperature, 5 cm (°C) 4. Bulk electrical conductivity, 5 cm (dS/m )	m3/m3
aM2! or aC2!	1. Volumetric water content, 10 cm (m3/m3) 2. Relative permittivity (ɛ), 10 cm 3. Temperature, 10 cm (°C) 4. Bulk electrical conductivity, 10 cm (dS/m)
aM3! or aC3!	1. Volumetric water content, 20 cm (m3/m3) 2. Relative permittivity (ɛ) 20 cm 3. Temperature, 20 cm (°C) 4. Bulk electrical conductivity, 20 cm (dS/m )
aM4! or aC4!	1. Volumetric water content, 30 cm (m3/m3) 2. Relative permittivity (ɛ), 30 cm 3. Temperature, 30 cm (°C) 4. Bulk electrical conductivity, 30 cm (dS/m)
aM5! or aC5!	1. Volumetric water content, 40 cm (m3/m3) 2. Relative permittivity (ɛ), 40 cm 3. Temperature, 40 cm (°C) 4. Bulk electrical conductivity, 40 cm (dS/m)
aM6! or aC6!	1. Volumetric water content, 50 cm 2. Relative permittivity (ɛ), 50 cm 3. Temperature, 50 cm 4. Bulk electrical conductivity, 50 cm	m3/m3   °C dS/m
aM7! or aC7!1	1. Volumetric water content, 60 cm 2. Relative permittivity (ɛ), 60 cm 3. Temperature, 60 cm 4. Bulk electrical conductivity, 60 cm	m3/m3   °C dS/m
aM8! or aC8!1	1. Volumetric water content, 75 cm 2. Relative permittivity (ɛ), 75 cm 3. Temperature, 75 cm 4. Bulk electrical conductivity, 75 cm	m3/m3   °C dS/m
aM9! or aC9!1	1. Volumetric water content, 100 cm 2. Relative permittivity (ɛ), 100 cm 3. Temperature, 100 cm 4. Bulk electrical conductivity, 100 cm	m3/m3   °C dS/m
aC!	1. Volumetric water content, 5 cm 2. Relative permittivity (ɛ), 5 cm 3. Temperature, 5 cm 4. Bulk electrical conductivity, 5 cm 5. Volumetric water content, 10 cm 6. Relative permittivity (ɛ), 10 cm 7. Temperature, 10 cm 8. Bulk electrical conductivity, 10 cm 9. Volumetric water content, 20 cm 10. Relative permittivity (ɛ), 20 cm 11. Temperature, 20 cm 12. Bulk electrical conductivity, 20 cm 13. Volumetric water content, 30 cm 14. Relative permittivity (ɛ), 30 cm 15. Temperature, 30 cm 16. Bulk electrical conductivity, 30 cm 17. Volumetric water content, 40 cm 18. Relative permittivity (ɛ), 40 cm 19. Temperature, 40 cm 20. Bulk electrical conductivity, 40 cm 21. Volumetric water content, 50 cm 22. Relative permittivity (ɛ), 50 cm 23. Temperature, 50 cm 24. Bulk electrical conductivity, 50 cm 25. Volumetric water content, 60 cm1 26. Relative permittivity (ɛ), 60 cm1 27. Temperature, 60 cm1 28. Bulk electrical conductivity, 60 cm1 29. Volumetric water content, 75 cm1 30. Relative permittivity (ɛ), 75 cm1     31. Temperature, 75 cm1 32. Bulk electrical conductivity, 75 cm1 33. Volumetric water content, 100 cm1 34. Relative permittivity (ɛ), 100 cm1 35. Temperature, 100 cm1 36. Bulk electrical conductivity, 100 cm1	m3/m3   °C dS/m m3/m3   °C dS/m m3/m3   °C dS/m m3/m3   °C dS/m m3/m3   °C dS/m m3/m3   °C dS/m m3/m3   °C  dS/m m3/m3       °C dS/m m3/m3   °C dS/m
aXLOADOS rrrrrCPU: OSname! where, rrrrr= baud rate OSname = OS name	Sends the new OS to the sensor; refer to Updating the operating system using the XLOADOS SDI-12 instruction
?!	Returns the SDI-12 address
1 Applies to the 1.0-meter probe only. 2 a is the SDI-12 address. In the SDI12Recorder() CRBasic instruction, the command parameter does not include the SDI-12 address because the address is a separate parameter.