26 Configuration and Calibration Guide HD0679 Rev 1.2.0
9 Outputting the Sensor Data
The sensor has data for all modes available at all times so the selection of mode to be used is
made when the output variable is chosen. This is now part of the process of optimising the
sensor operation for the material being measured.
The diagram below shows the arrangement of the data within the sensor:
Unscaled
Calculation
Moisture
Coefficients
Moisture
Calculation
Output Mode
(Current Loop or RS485 request)
Actual Output
Mode F
Mode E
Mode V
A, B, C, D (Mode F)
A, B, C, D (Mode E)
A, B, C, D (Mode V)
Mode F
Mode E
Mode V
Mode F
Mode E
Mode V
Current Loop or
RS485
Figure 11: Data arrangement in the sensor
9.1
Analogue Current Loops
If the data is to be output using the analogue current loop, then in addition to selecting the
Unscaled or Moisture output the user will select which mode to use. So for example, analogue
output 1 might be set to “Filtered Unscaled Mode F” or “Average Moisture Mode E”.
9.2
RS485 Protocol
The Hydronix Hydro-Link protocol has been extended to allow data for different modes to be
requested. Using the extended protocol the host might request “Average Unscaled Mode V”
or “Filtered Unscaled Mode E” for example. A full protocol specification is available by request
from Hydronix for users wishing to implement the Hydro-Link protocol in a control system.
9.3
Backwards Compatibility with Older Host Systems
For new host system implementations, the scheme described above (Figure ) provides
optimum performance and flexibility to determine and select the most appropriate mode for
any given material. It is recommended that any new implementations support this scheme.
Many sensors will be connected to older Legacy systems and some additions to the scheme
have been made to support these and provide compatibility. These Legacy sensors worked in
one of the modes, pre-determined and set with the Unscaled 1 Type parameter. They also
supported only one set of A, B, C and D calibration coefficients.
Sensors using HS0102 firmware have implemented a slightly expanded scheme to remain
backwards compatible. If the current loop output variable or Hydro-Link protocol request is
made without specifying a mode (as would be done by older host systems) then the Unscaled
1 type setting comes into effect. The relevant mode to output would be selected by the
Unscaled 1 Type. This extends the diagram as shown:
Summary of Contents for Hydro-Mix
Page 4: ...4 Configuration and Calibration Guide HD0679 Rev 1 2 0 ...
Page 6: ...6 Configuration and Calibration Guide HD0679 Rev 1 2 0 ...
Page 8: ...8 Configuration and Calibration Guide HD0679 Rev 1 2 0 ...
Page 10: ...10 Configuration and Calibration Guide HD0679 Rev 1 2 0 ...
Page 14: ...Chapter 1 Introduction 14 Configuration and Calibration Guide HD0679 Rev 1 2 0 ...
Page 28: ...Chapter 2 Configuration 28 Configuration and Calibration Guide HD0679 Rev 1 2 0 ...
Page 42: ...Chapter 4 Best Practices 42 Configuration and Calibration Guide HD0679 Rev 1 2 0 ...
Page 48: ...Chapter 5 Sensor Diagnostics 48 Configuration and Calibration Guide HD0679 Rev 1 2 0 ...
Page 52: ...Appendix A Document Cross Reference 52 Configuration and Calibration Guide HD0679 Rev 1 2 0 ...
