Strange run-time problem

I have a problem in my vi. When the vi loads up, everything seems to work fine, however I have two radio buttons at the top of the vi, and when I use them to select something my vi seems to freeze up. I've tried all kinds of debugging, and I can't find the error. I've also tried to eliminate all race conditions. Could someone please help me find the problem. Thanks!
Attachments:
UUT_io_setup_distrib.llb ‏329 KB

Hi Marshall
Your Problem Seems to Stem from the Fact that you have two Event Structures in One Loop. If you look up Caveats and Recommendations under event Structure in Labview Help, there is a Paragraph "Avoid Using two Event Structures in One Loop".
I took your Vi and Did the following Experiments.
1. Verified that the Vi does Hang as Claimed.
2. I Put the Tab control at "TTL" and then Deleted the Event Structure form the case "RS232" and than Ran your Vi. It works fine.
3. Instead of deleting the Event Structure totally, I deleted the event cases which are duplicated in the two event structures. "Yes" Value Change, "No" Value Change event and "Cancel" Event form event Structure under the RS232 Case. Left the timeout Case as is. I ran the Vi Again it Works Fine.
I believe - The Problem is this. Each Event Structure waits for events it has been programmed for. The event structures are in the same loop. The Event structures themselves have no way of knowing that they are embedded in a case structure and only one of them needs to execute. So after the First event the Program kind of hangs as the second Event structure Waits indefinitely for the Program to Pass execution to it.
So the Fourth Experiment -
4. I Used a Local Variable to Change the Tab to RS232 if I was in TTL and to TTL from RS232 if I was in RS232. This Local Vaiables are under the Yes Value Changed Event And Now I checked the Program, If Clicked Yes The TTL Case Executes Changing it and Correspondingly Changing the NO value, then it Changes the Tab Value So on the Next Iteration of While Loop my Program is in RS232 Case and Event Structure Executes and puts the Tab Back to RS232. In effect I have Made My Program Go through Both Event Structures This Works Everytime Only when I click on YES. I click on NO and Program Hangs as I did Not Built the Same Functionality for this case.
The Event Structures Cache the Events they have been Programmed for andthe First Event Must be Handled Before A second Event can take Place. In your Case One Event is in two Structures and at any given time One of these Structures executes. The Other Structure Waits and Inhibits furthur interaction till the Event generated can be handled by it.
On a Side Note. It is Advisable to Create an Event Structure and Embed your Cases within them And Also have Only One Event Node to Handle One Event Such as "YEs" Value Change. So you know what is Going on. and easy to Maintain Code. Also It will Help If you could Club Similar Controls in an Array and handle them that way rather than individually
I Hope I am clear in my explanation. I hope this is the reasoning why Your Program Hangs. I have attached your Vis slightly modified for you to see.
Good Luck!!
Good Luck!
Mache
Attachments:
UUT_io_setup_distrib.llb ‏329 KB

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<sig> http://www.itswalky.com http://www.crfh.net </sig>

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