close and reopen serial port with other baud rate

[mitulatbati]

Hi LabVIEWers,

In my project I have to send a kind of kernel to a device, via RS232 with 19200 baud.

Then I have to start the kernel (sending an ´S´ to the device, still with 19200 baud.

After this point I have to change the baudrate to 115200, and with this baudrate continue the communication. After speed change I send a "P" character to the device (a kind of ping), and the device should respond with 0x55. Normally this vi doesn´t work. BUT....

...if I set a breakpoint before the speedchange -> start the vi and wait until it comes to the breakpoint -> click CONTINUE on toolbar, ans IT WORKS! When I remove the breakpoint, it doesn´t work. I have tested this 100 times, this is reproducable.

I already tried to insert a wait instead of the breakpoint, but it doesn´t help.

What should be the problem?

regards

MB

[Graziano]

HI MB!
   I've tried to do what you want, with a silly example, and it seems to work.  I don't know if the problem is in the external device, or in VISA settings....  I think it can be worth to post your code.  I have LV 7.1, so please, post a backcompatible version, or just post an image, thanks!

graziano

[tst]

It seems likely to me that you have a race condition and that your wait does not work like you think it does. I would also suggest uploading the code.
Also, which versions of LV and VISA are you using?

[parthabe]

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