XLINK 500/100 Operations & Maintenance Manual page # 92
9.3.9. Measure Type: Manual Entry
Manual entry measurement types allow the user to enter a reading manually. That value
becomes the reading of the measurement. The station will store the user entered value in the
Offset field.
To enter a manual entry reading, use LinkComm's Calibrate button.
9.3.10. Measure Type: Internal Temperature
Internal Temperature measurements use a temperature sensor installed inside every unit. The
reading provided is in degrees Celsius. To convert from Celsius to Fahrenheit set the slope to 1.8
and the offset to 32.
9.3.11. Measure Type: Modbus
The system may be setup to collect data from Modbus sensors. Please see the MODBUS section
for details.
9.4. Processing Settings
9.4.1. Slope
See Offset below.
9.4.2. Offset
Every measurement is computed by taking the sensor reading, multiplying it by slope and adding
offset to it.
Measurement result = (sensor output)*slope + offset
Slope defaults to 1.0 and offset defaults to 0.0, meaning they will not affect measurement result
by default.
Traditionally, when using an analog sensor, slope and offset are required to convert the voltage
output by the sensor into desired units. The required slope and offset are provided by the sensor
manufacturer.
More complex equation processing is supported. Please see Equations below.
Slope and offset are applied after equations.
The reading before slope and offset are applied is referred to as the raw reading. For example, if
an analog sensor were to provide a voltage of 2 volts, and the user had set up the Slope as 5 and
Offset as 1, the final reading would be 11 (2*5 + 1). The raw reading would be 2.
Calibrating a measurements results in changes to the offset setting.
9.4.3. Use Equation
Select “Use Equation” to allow an entry of the equation in the box below it. See the next section
for examples.
9.4.4. Equation
Data collected from sensors may be processed through an equation. If the reading provided by
the sensor needs more than just an offset and a slope applied, equations provide that
functionality.
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