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

[kaustubh]

Hi!

Please send your vi, so we can get clear idea (about sequence 0,1,2..).

Whay everytime you are configuring serial port before writing and reding charcters???

[pincpanter]

Clearly, the device needs time to receive the S, react and reset its own baud rate. I can't see a reason why it should not work with a proper delay in the false case. How long did you wait?

[parthabe]

interlinked

[parthabe]

Sorry, this one here.

[Graziano]

Hi Parthabe,
   seems that you interlinked too

graziano

[Graziano]

Hi!
   the title of your post let me think that you opened and closed properly VISA port.... now that I see the code (even if as image) I'd suggest to close and open VISA in place of the breakpoint.  With my VI it works.


graziano