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System
10
DDE I/O Server
For real-time data exchange between System 10 and Windows® Application Programs
The Model 10SD-DDE I/O Server allows direct communication between System 10 and any software program that supports the Microsoft Windows DDE (Dynamic Data Exchange) protocol.
This includes*
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spreadsheet programs like |
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SCADA supervisory control software like |
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test, measurement, and control packages like |
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* All
named software packages |
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and many more . . . |
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See
also |
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Collecting measured and/or calculated data from a single System 10 instrument, the DDE server passes the information to one or more Windows-based "client" application programs that support DDE.
Data is transmitted in discrete data channels and logic bits via the System 10 mainframe's standard RS-232 computer interface at any standard baud rate from 300 through 19.2K.
Depending on the application program used as the DDE "client," live System 10-acquired channel and/or logic data might be
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displayed in a spreadsheet cell |
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graphed or otherwise incorporated into the user's "live" process control graphics |
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periodically logged to disk |
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analyzed in order that a given action might be performed in response to a perceived channel limit violation or other predefined condition |
The DDE Server passes data either in an ASCII TEXT DDE FORMAT or in a BINARY TABLE ("FastTable") DDE FORMAT. While operating at a slower speed, the text format can be used with virtually any application program that supports DDE. The "FastTable" format is presently is presently supported by fewer client programs, but offers significantly higher throughput.
"Hot" and "cold" DDE links are supported for both formats. A "cold link" exchange occurs on a one-time basis, in response to a "request" from the client program. A "hot link" exchange occurs on a continuous, report-by-exception basis, where the client program is continuously "advised" of any data updates.
In addition to servicing the client program's requests for channel and bit data, the software also allows the client to set a System 10 channel or bit to a new value—an action which can in turn be made to trigger an automatic command "EXECUTE" function within the data acquisition system. In fact, any valid command string can be issued to System 10 via the DDE link.
Complete on-line instructions and reference material are provided with the software.
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DDE
Server Bundled with the Model 10SD-DDE is a preprogrammed Excel spreadsheet showing how to integrate DDE with Excel's standard features to sample, monitor, manipulate, display, and control System 10-acquired data. |
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