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Hex 0xBFFF003A error with Keithley 2400 sourcemeter

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Hello guys, 

I have a problem that I have been scratching my head with for a week. I have a Keithley 2400 sourcemeter, I want to control it with my computer using Labview. I have done the following steps: 

1- I used the Labview Instrument drivers but unfortunately executing any labview driver results in this error: 

           

  VISA:  (Hex 0xBFFF000E) The given session or object reference is invalid.

 

2- I could communicate with the device using the simple serial communication example. but the device just responds to the write commands. I can set some parameters on the device but I can't read anything. 

 

3- Using NI max I still can send commands to the device, but trying to read the status byte or  sending any read commands results in error: 

 

VISA:  (Hex 0xBFFF003A) Unable to start operation because setup is invalid (due to attributes being set to an inconsistent state).

 

I am using labview 2017, and serial to usb converter (ch340). I don't know where this frustrating issue comes from and I haven't been able to fix it. 


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