Very strange error "(Hex 0xBFFF003E​) Could not perform operation because of I/O error"

[cocopa]

Hi everyone! I've seen many similar threads but I haven't found an answer. I'm using labview 8.5 and through visa i'm controlling a USB controller which communicates with an FPGA. This pcb, is connected to a second pcb which also has another FPGA and the data are transmitted from the usb controller to the first FPGA and to the second FPGA (and vice versa). The really strange thing is that the system had been working fine for severall months but now this error appears when i remove from its connector the jtag i use to program the FPGA located on the second pcb (!!!) and everything goes back to normal when i place it back! Could it be a hardware problem? 

[Greg-H]

Hi,

What protocole are you using to communicate to the board?  If it is VISA then it could be a problem with the COM ports and resources on your computer.  Is the session connecting to the FPGA still active when you are disconnecting it?

Regards,

Greg H.

[cocopa]

Yes, I'm using VISA and the communication is still active when i remove the jtag. I'll try to use a different pc to see if it's working. Thank you.

[cocopa]

I tried different pc, different pcbs but the problem still remains...