Figure 12: None Specified Output Selection; Figure 13: Legacy Output Selection - Hydronix Hydro-Probe Configuration And Calibration Manual

Configuration
Moisture
Unscaled
Coefficients
Calculation
A, B, C, D (Mode F)
Mode F
A, B, C, D (Mode E)
Mode E
A, B, C, D (Mode V)
Mode V
As older host applications are unable to write the A, B, C and D coefficients for each of the
modes, a final extension is made that supports a set of Legacy Mode coefficients which are
supported by existing host systems. This is shown in the final version of the diagram:
Moisture
Unscaled
Coefficients
Calculation
A, B, C, D (Mode F)
Mode F
A, B, C, D (Mode E)
Mode E
Mode V A, B, C, D (Mode V)
Selected by
A, B, C, D (Legacy)
Unscaled 1
Type (F, E, V)
If a current loop output is set without a Mode specifier or an RS485 protocol request is made
a Mode specifier
without
•
If the Legacy Coefficients are non-zero then these are used to calculate the Moisture
value. (Red arrows in the diagram)
•
If the Legacy Coefficients are all zero, then the Unscaled 1 Type is used to select the
relevant coefficients and Moisture (Green arrows). This enables a sensor to be fully
calibrated on a current host system in all modes and operated on a legacy host
system.
Unscaled 2
9.4
In Legacy sensor products a second Unscaled calculation was implemented to allow the
comparison of two modes at the same time. This allowed Unscaled readings for a second
mode to be output, but not Moisture readings. Unscaled 2 has been implemented in the latest
sensors for backwards compatibility, but as these sensors calculate all of the modes all of the
time it should not be used for new host system implementation.
In the latest sensors, multiple RS485 protocol requests can be made to compare modes, or
the two analogue current loop outputs can be configured for different modes.
Moisture
Calculation
Mode F
Mode E
Mode V
Selected by
Unscaled 1 Type
(F, E, V)

Figure 12: None specified Output Selection

Moisture
Calculation
Mode F
Mode E
Mode V
Selected by Unscaled
1 Type (F, E, V)

Figure 13: Legacy Output Selection

(for a Moisture value) t
Output Mode
(Current Loop or RS485 request)
Mode F
Mode E
Mode V
None
Specified
Output Mode
(Current Loop or RS485 request)
Mode F
Mode E
Mode V
None
Specified
hen the following process is followed:
Configuration and Calibration Guide HD0679 Rev 1.2.0 27
Chapter 2
Actual Output
Current Loop or
RS485
Actual Output
Current Loop or
RS485