Python library "nidcpower" to NI PXIe-4163 SMU returns error on session open "-1074135040: IVI: (Hex 0xBFFA0000) Unrecoverable Failur"

[kirsch]

I'll be honest that this is stumping us. You are the first to report it.

The driver seems to work, overall... except when called from python.exe

We can tell that the driver library loads successfully, and the error code is coming back from apparently the initialize function.

Could you try to capture the NI I/O Trace output to see exactly what parameters are being passed into it?

[ChetKnu]

import nidcpower

import nidcpower.errors

try:

    session = nidcpower.Session(resource_name='PX1Slot3')

    session.abort()

except nidcpower.errors.DriverError as e:

    print(f"DriverError: {e.code} - {e.description}")

except Exception as e:

    print(f"An unexpected error: {e}")

[ChetKnu]

[ChetKnu]

Sorry, I had a error in slot naming, same result either way... trying multiple things

[jayfitz]

It looks like the wrong init function is being called, given your arguments. Try

```
session = nidcpower.Session(resource_name='PXI1Slot3',channels='0', independent_channels=False)

```

[ChetKnu]

import nidcpower

import nidcpower.errors

try:

    session = nidcpower.Session(resource_name='PXI1Slot3',channels='1',independent_channels=False)

    session.abort()

except nidcpower.errors.DriverError as e:

    print(f"DriverError: {e.code} - {e.description}")

except Exception as e:

    print(f"An unexpected error: {e}")

[kirsch]

Please remove the try/except. Let's see exactly which C library call the error is coming back from.

[jayfitz]

>It looks like the wrong init function is being called, given your arguments. 

Please disregard this comment. niDCPower_InitializeWithChannels is deprecated in favor of niDCPower_InitializeWithIndependentChannels (which you are calling and which does accept individual channel names, if you are only opening a session to a single device).

[ChetKnu]

Removed try/except trap:

import nidcpower

import nidcpower.errors

session = nidcpower.Session(resource_name="PXI1Slot3",channels="1",independent_channels=False,)

session.abort()

more simplier form:

import nidcpower

import nidcpower.errors

session = nidcpower.Session(resource_name="PXI1Slot3")

session.abort()

[ChetKnu]

Not to go off topic, but using the python daqmx library, I have no issue communicating with the PXIe-6341 DAQ in slot 2 of the PXI mainframe PXIe-1084, over the Thunderbolt interface PXIe-1084.

import nidaqmx

with nidaqmx.Task() as task:

    task.ai_channels.add_ai_voltage_chan("PXI1Slot2/ai0")

    test = task.read()

    print(test)