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Monitoring and Charting Real-time Data
This task requires that a real-time data generating program is
dumping data to a text file (the data source) periodcally. To monitor and graph the data
source, follow these steps:
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Create an empty project by selecting the File:
New Project menu command or by clicking the 
icon on the Standard Toolbar.
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Select
the Project: Add To Project...: Data
From Text File(s) menu command or the 
button on the Standard Toolbar to
open the
Text Data Source dialog box.
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In
the File Source group-box of the dialog box, double click the cell with the text
"Double click to add files(s)..." to open the File Open dialog
box. Select the data-source file and then close the File Open dialog box.
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In
the File Source group-box of the dialog box, set the Persistence
property for the file to Linked, close the dialog box by clicking its OK
button.
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With the newly added data table selected as the
active document (a document can be activated by clicking the corresponding node in the Navigator), select the appropriate graph tools on the ToolBox
under the All Graphs, Common Graphs, Financial Graphs, Statistical
Graphs, or Special Graphs tab to plot the
data.
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With the data table selected as the active
document again, click on the Data Tools tab of the ToolBox
to expand it. Select the Refresh Linked
Data tool to open the Refresh
Linked Data dialog box.
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In the dialog box, check the Repetitive
Refresh check box and make sure that the value in the Timeout (ms)
spin box is about 10 times larger than the data-source updating period.
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Click the Start button to start the
real-time refreshing. Both the data
and its dependent series will be refreshed automatically when the
data-source file is updated by the updating program.
See Also
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