VISA: (Hex 0xBFFF001E) The specified state of the attribute is not valid, or is not supported as defined by the resource.

[James1234]

I am trying to open a serail com port  in Labviewand am getting this error:

VISA:  (Hex 0xBFFF001E) The specified state of the attribute is not valid, or is not supported as defined by the resource.

It occurs in ISA Configure Serial Port (Instr).vi and appears to be related to the Baud Rate. If I use anything other than 9600, I get this warning. I need to use 115200. I can successfully open other com ports at 115200.  

I am able to talk to this device using other terminal programs at 115200 with no issue. It is only through LabVIEW and also NI MAX.

The device shows up as "Stellaris Virtual Serial Port (COM12)" in the deveice manager.

Is there a way around this?

Thanks in advance!

[WishKebab]

Hi James, 

It's good that you can interface with the device using other terminal programs, as this will indicate it is working properly.  Can you post your LabVIEW code so we can see how you've set it up?  Can you post some screenshots of the error as well?

[James1234]

You can get this error using the Labview Example "Basic Serial Write and Read.vi". The actual error is below.

Again, this only happens with this one specific serial device and only with NI VISA.

[WishKebab]

Hi James, 

It's strange that you would be able to communicate at 115200 kbps in other programs, but not with LabVIEW/MAX.  What version of LabVIEW and the NI-VISA driver are you using?  What version of NI-Serial?  If you attach a MAX technical report, we can see the different NI software you have installed:

Documenting Measurement & Automation Explorer (MAX) Configuration Information Through MAX Technical Report

http://digital.ni.com/public.nsf/allkb/271F252B4EF0A2E0862570E70056A1E4

The past issues I have seen that diplay this error were resolved by installing a new version of the driver.  Here is a link to the newest version of NI-VISA:

NI-VISA 5.4

http://www.ni.com/download/ni-visa-5.4/4230/en/

NI-VISA and LabVIEW Version Compatibility Chart

http://digital.ni.com/public.nsf/allkb/CF4279A34F855AB186257B1F00003B82

[James1234]

Attached is a screenshot of the version. If you need a report, let me know your email so I don't have to post publicly. Thanks!

[WishKebab]

Hi James, 

It looks like you've got all of the most recent driver versions.  Are you using the VISA Configure Serial Port VI?  If you open the VISA Configure Serial Port VI, you can see that it is simply setting a bunch of properties via an instrument property node.

Try removing each of the properties in turn to see if any of them is causing the error to appear.  

Can you get the code to run at a different baud rate (even if it doesn't return valid data from your device)?

[janeksz]

Hi

 I don't want to still your post, but I have exactly the same problem - same error on the same hardware.

I did the VISA driver update to the latest version and it didn't help.

If the baudd rate is set to 9600 there is no error, (but I need the baud  rate = 115200).

Did you manage to resolve the issue in a meantime?

If yes, can you share the solution?

Jan

[James1234]

Hi Jan

No, I have not found a solution to this. I assume it is an incompatibility with NI VISA and the USB serial driver.

[janeksz]

Thanks James,

 It's not the news I would like to hear.

Kevin, can you think of some solution?

Thanks

Jan

[Dennis_Knutson]

What is the brand of the converter? What chipset (i.e. FTDI, Prolific)? Have you tried getting the latest driver? What version of NI-VISA?