I am creating a VI in labview for serial communication , But i got the following errors .

[arun2929]

closing serial port is also done there @Gredw

[arun2929]

i installed all the visa drivers perfectly and when i open MAX  it recognise the serail port as COM port , but when it shows the errors please find the following attachments  of images  and suggest me what can i do ??  to solve those errors .

Thank you in advance 

[kosist90]

1st screenshot: seems, that your VISA resource is occupied by some another process/application. Close all apps, what can use it, and then try again. Also, it's good practice to add to LabVIEW settings, in Options->Environment "Automatically Close VISA Sessions".

2nd screenshot: you didn't select any VISA resource, control VISA Resource Name is empty.

Sincerely,

[GerdW]

Hi arun,

just look at the attachment , you may get what is the exact problem i am facing

- You still have NO error handling at all…

- You still use BytesAtPort immediatly after VISAWrite!

- You still use BytesAtPort despite you configured a TermChar!

Last, but not least:

- You don't provide a VISA resource in your VISA resource name control…

When the errors complains about wrong/missing parameters you really should check all parameters/inputs of that function!

Edit:

PLEASE DON'T CREATE DOUBLE THREADS!

Keep discussion in one place! I merged your second thread on the very same topic!

[arun2929]

@kosist90  yeah i closed all other applications and i select in environment settings and check mark on automatic visa....

even through it doesnt help us it shows same error , And The same errror occured when we create any VI on serial port 

[GerdW]

Hi arun,

no need to show the very same image again and again!

Select a VISA resource before you start your VI!

[crossrulz]

Your VISA Resource Name is still empty.  You have to select which port to use before running your VI.

[arun2929]

Hi Gredw

I know I am annoying you , But i  am aBeginner ... I get same error even i create any VI on serial port please check the following attachment , i find that example in our forum even i execute that example i get the same problem 

can you please edit that VI or suggest me any of your example for communicating over serial port 

Thank you

[arun2929]

I think i select visa source name ,  check the image .. so can you please how to give visa source name , and what type of name we should give .

Thank you

[GerdW · Accepted solution]

Hi arun,

as mentioned several times before:

You need to select that "COM23" resource name in the "VISA resource name" control in the frontpanel of your VI!

I hope I made that clear by now…