Error -1073807339 occurred at VISA Read in Keithley 27XX.lvlib:Error Query.vi-

[LTBALAZS]

Dear all,

I use Keithley 2700 with serial communication. If i loose communication with instrument after hours of data acquisition I must restart computer.

What does not work for me:

- reconfiguring communication runtime,

- reset keithley (power off/on),

- close and start labview application,

- change of communication cable from serial to USB cable

- software updates: NI 488.2 16.0 to 19.5, NI Serial 17.5 to 19.5, Installed: Keithley I/O Layer version C10

This issue with communication still occurs even after NI software updates.

I get the following error:

'Error -1073807339 occurred at VISA Read in Keithley 27XX.lvlib:Error Query.vi->Keithley 27XX.lvlib:Error Query (Multiple).vi->Keithley 27XX.lvlib:Configure Scan.vi->SUB = KEITHLEY INIT.vi->MAIN = test.vi'

Could anyone please share ideas to fix this issue? What can this issue be related to?

Kind regards,

Balázs

[vardanium]

Is it possible, that data transfer buffer is overloaded? 

[cstorey]

It would help to see your code.  If possible reduce the code to a simple test case.  That way we can spot potential errors.

Without seeing the code, I can say that I've had issues with USB-serial converters and also with USB power settings (Windows selective suspend) dropping out and causing problem like yours.  Power settings help, see here - https://www.windowscentral.com/how-prevent-windows-10-turning-usb-devices

When selective suspend happens the software still has an open handle to the instrument but its no longer valid, and only a restart fixes things.  

For long term measurements use LAN or GPIB and avoid USB.  I've gone back to PCIe-GPIB cards over USB-GPIB adaptors and those fixed the problems I was seeing.

Hope that helps.

Craig

[LTBALAZS]

Hi Craig,

You can find my VI as attachement.

Kind regards,

Balázs

[cstorey]

If any error triggers a reset then your code needs to a shift register so that the VISA resource ID gets passed back to the read inside while loop catches the new ID.  Wires on one right side of a loop only pass values back to the left side of a loop if you use a shift register. Like so ..

 

This still might not be enough to solve your problem, but at least if its possible to restart communications then there's a chance it would work.

Craig