event structure/writing to VISA

[Tzench]

I have written som code that is supposed to make it possible for a user to select a string constant and send it to the serial port. It uses the VISA-function and an event structure. It does not work. I include my VI. The "character buffer" is for testing that the event structure actually sends out a string. I haven't actually yet tested the VISA part.

[Coq_Rouge]

This program will only write to the serial port once, and that will happend then the while loop ends. Put the write to serial port inside your case structures. Remember also that you only have to use the "visa conf serial port" once.  Also you must brush up on debugging in Labview. These tools are your best friend

[GITA_A]

Hi,

      Could you post your sub vi also.

[Tzench]

"visa conf serial port"?

[Tzench]

So what you are saying is that I have to move the conversion and the VISA-write into every case of the case structure? It does not sound right...

[GITA_A]

Hi,

            you cannot send a data thriugh visa until you stop the while loop so the attached picture may help.Do the small modification to your code and let me know if it works.

[Tzench]

I've done as in the picture, putting a VISA-write in every single case. Judging from the character buffer, it only works for case 0.

[GITA_A]

Hi,

            I am not sure i have understood your previous reply. Is it that case is always 0 if so just run the vi, change the frame ring control which you want to send every time and then press send.  When vi is in run mode if you toggling the ring menu you can see the change in data you want to write in a character buffer indicator provided. Hope this helps you.

[Tzench]

What I meant to say was that only when the ring menu was set to case 0 was a string sent to the character buffer.

However, I was wrong. By following your suggestions I have created a new charcter buffer for every menu option. It just happened that these was out of bounds for the front panel window. So all of them works except that they send messages to different string indicators. While this is annoying, it is not really my crucial problem, as I suppose it will all be allright when I write to the VISA.