2.16.2.1.14 Chart element

The (strip) Chart display element shows a strip chart of a numeric parameter. The chart advances with a constant speed of 1 pixel / second. The default y-scale is 1/division but may be changed by clicking to the menu button in the chart on top right corner.

By default, the strip chart element lets the y-scale offset follow the displayed value that the recent measurement samples are shown in the diagram. This behavior is optimized for applications where the strip chart shall indicate a 'trend' for the displayed value, using an element height of only 50 pixels or less.

Optionally you may disable this variable scaling by defining fixed scale values in the 'Text / Image Name' field. With this fixed y-axis scaling an additional threshold check may be added, turning the chart background to red if the actual value exceeds the defined limits. When used with limit checking, the height of the chart should be at least 100 pixels.

The attributes listed below may be configured to customize a display element of this type:

• Message ID: The message ID addresses the parameter the element shall display or edit. The message ID consists of the MNC name, device name followed by a colon and the name of the parameter.ANT.11.XMIT-1.tx.on for example addresses the variable tx.on at a device named XMIT-1 at MNC.

• Label: The label text is drawn above the element.

• Font: Font contains two options:

  • Font: The font attribute applies to the text shown in the parameter field itself. The label text is shown with the standard ("plain") font size for all font selections except the smallest one. In the latter case the label is drawn using this small font size, too.
  • Color: The color attribute of a parameter element sets the color of the label shown above the entry field. The text in the parameter field itself always is shown in the default text color of the selected look & feel. Colors may be specified by using a hexadecimal RGB notation. You may click to the color example field in order to open a color chooser dialog and select the color from there.

• Mode: Selects the display mode of the chart element. Four modes are available:

  • Auto scale: This is the standard display mode. The strip chart aligns the reference value (the medium display line) in a way that every new display point is shown on this line. The initial scale is 1 unit/div.

  • Fixed scale: Works like the auto scale mode, but the scale value gets initialized with a user defined value.

    • Scale: The initial scale value used with the 'floating, fixed scale' mode.

  • Fixed range: The min/max values to display are defined explicitly, there is no automatic reference level alignment with this mode.

    • min value: The minimum value to display for the fixed range display modes.
    • max value: The maximum value to display for the fixed range display modes.

  • Fixed thresholds: It is like the above mode, but additionally there are min/max thresholds defined. If the actual value of the monitored parameter, the display background changes to red.

    • min value: The minimum value to display for the fixed range display modes.
    • max value: The maximum value to display for the fixed range display modes.
    • min threshold: The lower threshold value for the "fixed range & thresholds" mode.
    • max threshold: The upper threshold value for the "fixed range & thresholds" mode.