Programmatically Reading and Setting PQA MTF Parameters

I'm currently using PQA 1.6 and I'm trying to figure out how to programmatically read and set PQA MTF parameters from a configuration file that I made using the PQA 1.6 GUI. The configuration file that I created is for an MTF test with a ROI already configured.
I went through NI's example of how to modify the provider's settings from a configuration file, I then tried to move on to reading and modifying the existing MTF parameters with no luck. I did see that there is a way to completely override the MTF parameters by using the Provider:Video:MTF method although I would have to then create my own ROI descriptor when I already have one in the configuration file. I simply just want to change one little MTF parameter. So my question is how can I change MTF parameters of an exisiting PQA configuration programmatically.
Below is a snapshot of my VI in case anyone is curious.

Hi DanielID,
After looking into your issue and speaking with some of my colleagues, this is what we have come up with.
It is expected behavior that when you change your resolution, your ROI will be reset. This is because your ROI changes when your resolution changes, and without redefining your ROI, it would yeild unexpected results.
We were, however, able to figure out how to programmatically change the ROI of the configuration file. Take a look at this example that shows how to do this.
Please let me know if you have further questions concerning this example.
Regards,
Leah
National Instruments
Applications Engineer
Attachments:
NI PQA - Scale ROI Position for Different Provider Resolutions.vi ‏35 KB

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I am currently working with two instruments; an Agilent E3646A and an NI 6212 BNC. My objective is to have the 6212 to be continuously taking measurements according to predefined parameters while the E3646A's parameters can be continuously updated. This simple instrument combination is intended to help me learn the necessarry achitecture; continuous measurement, dynamic output control, and more instruments will be added in the future.
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Solved!
Go to Solution.
Attachments:
DCe3646A_DAQ6212_Prod_Con_4_13a_2014.vi ‏89 KB

Jon,
Thank you for the response and the suggestions.
I created the Local Variable for the Stop Button and moved the original into its own Event Case. It is now able to stop VI execution although I get Warning -1073676294 which I understand to be the buffer issue. The warning says that this was incurred on VISA Open for the E3646A's Initialize VI which is outside both loops, however, which I don't understand.
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Attachments:
DCe3646A_DAQ6212_Prod_Con_4_14a_2014_Edit_I.vi ‏90 KB

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