B&B Electronics MODSCAN32 - Manual - Manual (Page 52)

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Bar Chart Items
Bar Chart items allow a modbus register value to be displayed as a colored bar whose amplitute represents
its current value. Bar Charts may be drawn vertically, (bottom to top), or horizontally, (left to right), and
the respective sizes are determined by user defined properties. Properties also define the source of the data
used to update the chart and various drawing options such as the colors to use and whether or not to
surround the bar chart with a border.
Trend Chart Items
A Trend Chart MMI Item allows you to represent one or more modbus register values as a line graph of
amplitude over time. Up to five different variables may be displayed within a Trend Chart item with each
register value represented by a defined pen color and scaled between specified high and low limits.
Properties for the Trend Chart define its update frequency and background color as well as allowing the
chart to be optionally surrounded by a border.
Dials
Dial gauges may also be added to a custom display. Properties for the dial include the bitmap to be used to
draw the face of the dial and the modbus register value representing the source of the data used to update its
value. The dial’s needle may be located anywhere on the bitmap by specifying its X & Y coordinates.
Properties also define the needle width, length, and sweep.