TREND 963 User Guide - Manual (Page 44)

Using 963
963 User Guide TC200635 Issue 3 25/03/2008 44
3.5.3 Display a Chart
A chart of values from a controller can be displayed from either a schematic page, or an existing graph.
To display a chart:
1. Display either a compact graph, or a precision graph as described in the appropriate section of this manual.
2. On the Graph menu click Chart points. The 963 dialogue box is displayed.
3. Click Yes if the existing data is to be cleared before the charted data is displayed, click No if charted data is
to be added to the existing data. The selected value(s) will now be charted at a refresh rate of 15s. To
change the refresh rate click Refresh rate and enter the required refresh rate in seconds (range 1 to 600) in
the box.
Note that it is not possible to graph values from BACnet devices.
Clicking OK will close the graph. To view the time and the value click a point on the graph. To display a
vertical bar that can be dragged along the graph displaying the values click Show Values on the Graph
menu. You can zoom in and out of the graph to make it easier to see the data, a grid can be displayed, and
the scaling of the Y-axis can be fixed to allow graph traces to be compared. The Y-axis can be swapped,
this means that values with similar units or range can be set to use the same Y-axis. If graph definitions
have been set up they can be loaded when needed, or the existing graph definition can be saved as a graph
definition. A graph can be printed, or the points of a particular trace displayed as a list of points. Recorded
graphs can be playedback or graph recording can be specified. The graph can be recorded to the 963’s
database for playback later, or can be recorded to a text file for use in other applications.
3.5.4 Load a Graph Definition
The specifications about which traces appear on a graph, how the grid etc is set up can be saved as a graph
definition. These set ups can be loaded later, the set up of the graph is retained, but the latest data will be displayed.
This saves time if there are graph traces that are viewed and analysed in the same way on a regular basis.
To load a graph definition:
1. Display the page containing the button that enables the graph definition to be loaded as described in the
‘Display a Schematic Page’ section of this manual and click the button or graphic that displays the required
graph definition.
Or
1. Display either a compact graph, or a precision graph as described in the appropriate section of this manual,
and on the File menu click Load, or right-click in the right of the Device Viewer, and on the displayed
menu click Load a saved graph-setup. The Please choose a graph definition dialogue box is displayed.