VISA baudrate configuration change inside a loop

[jimza]

Hi,

In my application I read a load cell value using the serial port. I'm using VISA configuring serial port to initialize the port (9600. 8 , None, 1, None).

Last week I`ve changed my computer and since then I'm having problems with VISA configuration. In some loops, the baud rate change to 1200, so I can`t get the cell value.

I've already checked COM1 configuration in my OS and everything seems to be fine.

I don't have any idea about what is happening, could anybody help me. Thanks

Ignacio

[Albert.Geven]

maybe a racecondition somewhere.

Post your code and check all error in error out wires

[jimza]

Hi, here is a simplified version of my code. I hope this is clear enough. Thanks

[smercurio_fc]

Do not perform a serial port configuration inside the loop. It is totally pointless to keep reconfiguring the serial port in each iteration. The serial port configuration should be outside the loop, and you should close the serial port once (after the main loop is done). Your code is difficult to follow. The garish colors you chose makes it close to impossible to see the Boolean wires. What's driving the case structures? What's controlling the loop condition terminals? Why do you have  loops inside the main loop? Please post the actual VI (and subVIs).

[jimza · Accepted solution]

Thanks for your reply. I understand that it seems poitnless but I prefer to keep the VISA configuration inside the loop in order to allow a user to reconfigure the instruiment during execution. Anyway, I'll look for other ways to do it better.

The solution was to remove "VISA close" block as you suggest. Thanks again

[smercurio_fc]

Then you should redesign your code so that the reconfiguration happens "on demand", rather than the way it is now. All you're doing is wasting resources performing unnecessary operations. There is no "seems pointless" about it. It is 100% pointless. Look into using event structures or a state machine.