Execution of highlight mode prevents update of UDP data VI

Hi all

I worked with a VI (Labview 2012) which receives digital data from a target of RT, via UDP.  I noticed a flaw and decided to solve using the execution mode to highlight.  When I did this, the UDP data stopped to update in real time, and it only changed when I rebooted the VI.  To confirm the problem, I stripped everything except the basic UDP functionality, and VI had the same behavior.  UDP data real-time updates when running at full speed, but not refresh any when running in runtime to highlight mode.  Is it possible that delays that make the data readable human flow VI are originally from the VI to miss the UDP data?  Please notify.

Thank you

GSinMN

When I wrote my last response to this thread, I have also thought about the timeout (default value 25) being a possible reason, but scrapped that.

As far as I know, the time-out for the read/write occurs only if the buffer is full. But it seems that you don't spend so much data that it is a question...

So a different conclusion:

(1) execution of the host Windows VI with nail does not update the VI host more.

(2) run the host with active highlight will update the user interface of home once.

(3) you do not get error.

Things you should know / you need to do:

(a) UDP is a protocol with loss. So if the host receives all the data, it will not raise an error. He simply ignores the values. UDP does not guarantee the consistency of the data.

(b) verify that the Read UDP function returns no data in apotheosis. I think he should get the data...

(c) improve your error handling: include a 'GOLD' between your stop button and loop Terminal and wire from the cluster of error him. This will stop the loop in a case of mistaken more. I think this is the main reason to run the host in apotheosis...

(d) include some waiting time in the loop. Currently, your loop time is defined by UDP read with timeout. I don't know if you really want to have 100% of the CPU to load once a lot of UDP packets arrives. If so, maybe you should go for TCP.

hope this helps,

Norbert

Tags: NI Software

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