How can I use notifications to send data from different sources to thesame chart?

Hi,
I am using the "Continuous Measurement and Logging" template project that ships with LV 2013.
It is extremenly helpful for figuring out messaging between the acquire, graph, and log loops. (Thanks NI!)
I've run into a snag however.
I would like to modify it so that my graphing loop receives data notifications from two acquisition sources via notifiers.
I'm having trouble getting data from both sources to display on the same chart.
I've isolated the issue in the attached vi.
Here's what happens:
1. I create data from 2 parallel loops and send the data to a third parallel loop with notifiers.
2. The third loop receives data from only one of the loops because one of the receiving notifiers just times out instead of receiving data.
Can someone suggest how I can fix this?
Thanks.
- Matt
Solved!
Go to Solution.
Attachments:
test notification loop.vi ‏42 KB

Here is my modification of your VI. I put notes on the block diagram to explain the changes. It uses a queue for the data transfer to avoid loss of data. It uses a notifier to stop the loops. All local variables and Value property nodes have been eliminated.
The way the loops are stopped will likely leave some data in the queue. No more than one or two iterations of each of the data acquisition loops. If you need to guarantee that all data has been displayed (or saved in a real application), then you need to stop the acquisition loops first and read the queue until you know it is empty and both of the other loops have stopped. Then stop the display loop and release the queue and notifier.
Lynn
Attachments:
test notification loop.ldj.vi ‏1036 KB

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How can I use notifications to send data from different sources to thesame chart?

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