Condition labview

[RavensFan]

Attach whatever VI you have that you say doesn't work.

[Frozen]

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@DébutanteLabVIEW wrote:

... I have to create a loop that waits for M , I have to look for the character "M" .... 

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You want to look for "M" then you need to search for it by changing your code in the red circle below. 

Both  Crossrulz and GerdW already gave you the answer, so not sure how else to say it.

Good luck