Event Structures-best way to implement this UI?

I am trying to write a VI to control & read data from 4 different "channels" (each measuring a DUT) at once. I have written all the VI's for initializing instruments, communicating with the devices (VISA, GPIB), setting bias, reading data, etc...that has all completed. I just need to write the overall program with the user interface to allow the user to control these 4 channels & display the measured data.....as it turns out, this is the tricky part! My head is spinning from trying to figure out how to handle all the possible events.
Basically for each channel, I want the user to be able to
-enable/disable it for measurement (e.g. if there is no device loaded in Ch.3, we don't want to measure Ch.3..maybe disable/grey everything)
-set bias conditions (only if channel enabled). Allow user to change bias "in real-time" by increment/decrementing (e.g. incrementing from 5.00 V to 5.01 V, for example).
-turn biasing on/off (again, only if channel is enabled)
Also, I want each channel to display its measured data (e.g current, temperature reading)..every second or so. No graphs or anything fancy (for now! ), just numeric indicator.
Honestly, this all sounds so simple but I'm having trouble figuring out the best way to implement this, due to the fact that 1) there are multiple channels needing to be monitored for events 2) large number of user events that could occur (seems like at least 4 per channel - enabling/disabling, turning bias on/off, incrementing/decrementing bias values, etc ), Also the if a channel IS enabled, i want to be continously reading/displaying the data. What is the best way to handle this? Should i have 4 separate while loops, each with an event structure to handle events for that particular channel..or will that give me grief somewhre?
Also, I have another nagging question. Pretty much all the examples I see re: Event Structures and booleans involve latched booleans, eg. buttons that are just pressed once and pop back up...e.g. buttons you press to tell it to complete a task (e.g. "Acquire Data" or "Stop") , and once it's pressed it's over and reset. In my case, some of the booleans would not be latched...e.g. the "Enable Ch.2" button would be 'TRUE" as long as i want Ch. 2 to be read....does that make sense? Then, say hours later, if i did want to disable that channel, i would change it to "FALSE" and while that would be an "value change", the new value would not be "TRUE"..does that make sense? So not sure if that would be dealt with the same way in an Event Structure.
Hope this all makes sense and many thanks in advance for any help!!!

You're halfway there. I'd say the best solution is a producer/consumer structure, the event structure is used to generate queued commands to the consumer loop.
All data is handled in the consumer loop, where you among other things have an array of clusters of channel/instrument settings. (I usually have several cluster, one for test data, one for instrument settings, one for general settings and so on)
The event structure can have a 1 sec timeout, in which you queue up a Measure command.
In the consumer, in the measure state you loop through your instruments and if enabled you measure them and update their indicators.
The general (smart) way to setup the queue is with a cluster containing 2 elements, a typedef'd Command and a variant.
This way you can send data with the command in any form which is then interpreted in the consumer.
If, e.g. you press the Enable button on a channel, you can enqueue Enable and the channel number.
/Y
LabVIEW 8.2 - 2014
"Only dead fish swim downstream" - "My life for Kudos!" - "Dumb people repeat old mistakes - smart ones create new ones."
G# - Free award winning reference based OOP for LV

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Hi David,
The code you posted will work, although note that the front panel becomes 'unresponsive' - as changes in the controls are only read once per iteration. The wait function is an example of an execution timing VI, however if we want to do software timing (like a 2 hour wait) - we should use software timing VIs.
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Attachments:
SoftwareTiming.vi ‏26 KB

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>
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well if I made it non-static, wouldn't I have to create a new object of that class in each class I want to use it in?
for example, that class that populates the database must parse a file to create the database.
RODMFileParser file = new RODMFileParser();
          file.parseFile("QAGENT");So inside each class I would have to do this wouldn't I? if I made it public static, wouldn't I only have to read to the disk once?
Putting it to a worst case say, 100 classes need this database, that means I would have to make 100 accesses to the disk woulnd't it?
And if it was public static, it would jsut return a copy of the database that was only read from the disk once or am I misunderstanding how it works?

The Excel-Mania - Best Ways of Implementing Excel-Like ADF

Hello people, good afternoon!
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Best Regards,
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4) Override doDML() in the entity object class to call your procedures (the doc explains how to do this). You might also need to do a bit of research and figure out if you need to override some other method so you can report rows with transient attribute changes only as needing posting. (getPostState(), maybe?)
5) Create a view object definition with entity-derived attributes based on your EO attributes.
6) Override the appropriate methods to call your data assembly procedure rather than execute a query (this is also in the doc).
Still kind of kludgy, but it keeps your business components pretty clean, especially if you use framework classes to do most of the work for you. (I have a partial example of how to do that here.) Of course, it keeps your business components clean by moving the real work to the DB, but some people find that more maintainable that a kazillion business components.
Hope this helps,
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If you require professional support, contact me via my site: http://www.wvanweelden.eu/ and we can talk about your options. Note that this is not associated with my forum contributions nor is it in any way affiliated with Adobe.
Greet,
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"Daniel Selman" <[email protected]> wrote:
Ryan,
Check out the thread (a few days old) titled "Different ways of creating
portlets".
Sincerely,
Daniel Selman
"Ryan Richards" <[email protected]> wrote in message
news:3d2eda12$[email protected]..
I have a few existing applications that I need to port over to portletsin
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Hi
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Hi,
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