How do I get the vi to wait for the user to select a COM port?

[Havelld]

This is a problem when I run the application.  If the COM port selected is not the one actually connected to the hardware then I get an error.  I can then select the correct COM port, re-run the application and everything is fine.  But I want the application to run when called by the user and wait until the correct COM port is chosen.  I will settle for the selection of any COM port and put the responsibility for proper selection on the user.  Thanks to all.

[MikeS81]

Hi Havelld,

you can use an event structure to wait for the selection.

Mike

[muks]

Had the same problem. I used to select the highest com port number available. When I ported the hardware the com port number used to get incremented.

You can use a while loop like this

[MikeS81]

Hi muks,

how should someone change/select the com port if you use a constant in a running vi?

Mike

[muks]

Mike,

It is just to show the com port number which has gone to 23 in the picture. Obviously one has to change it to a control.

[Havelld]

Okay, that makes sense.  I'll try that.  Thank you for your time.

[Havelld]

Mike,

Yes, I have tried that but I am afraid I don't understand event structures well enought to make it work.  Maybe I wasn't properly placing the event structure; i'm not sure if it should be a separate loop or somehow incorporated in, or around, the main loop.

Do you have a good example or tutorial I can start with?

Thanks,

[MikeS81]

Hi Havelld,

the attached picture shows the simplest solution. If you already use an event structure in your vi, then you should integrate this function into the existing structure. I don't recommend to use more than one event structure per vi.

Mike

[Havelld · Accepted solution]

Of course.  It's working great now.  Thanks MikeS81!

[David_49]

Hello all,

is it possible to have your file in Labview8.0, please ?