Linear (Scalar) Channel

Overview

This is one of the most commonly used channel types. The channel is scaled using a linear scaling equation y = mx + c - i.e a multiplier and offset.

Settings

Scalar

The multiplier value (m in y = mx + c).

Offset

Added to the value after applying the multiplier (c in y = mx + c).

Signed

If ‘signed’ is checked then raw input values are treated as twos-complement numbers.

Reciprocal

If ‘reciprocal’ is checked then the scaling equation takes the form y = (1 / x) * scalar + offset. If the input value is zero then the result will be the special floating point value NaN (Not a Number).

Graph

The graph shows the scaling relationship.

Minimum

Sets the minimum value to show on the X-axis of the graph. This has no effect on the setup when running on the display.

Maximum

Sets the maximum value to show on the X-axis of the graph. This has no effect on the setup when running on the display.

Calculation from Reference Values

If a pair of reference values for input vs output are available (e.g. from a sensor data-sheet), click the Calculate button () and enter in the values. Clicking OK will compute the scalar and offset required to fit the pair of points.

Supported By Displays