Programmation des dispositifs NI en utilisant Python

[ElvisMARROQUIN]

Good morning! I hope you are doing well.

In less than a year, I have acquired some NI equipment, such as a PXIe 8842 and a cRio9056.
So far, I have created graphical interfaces in LabVIEW to interact with these devices without any problems.
However, my team now wants to use PYTHON to interact directly with the inputs and outputs of these NI devices.

After some research, I discovered that there is a library called nidaqmx in Python that supposedly allows me to interact with NI devices that appear in NI MAX.
However, after making several tests, I cannot read the inputs of my devices in Python.
Looking for more information, I found that for nidaqmx to work, the devices that appear in NI MAX must not be listed under REMOTE SYSTEMS; they should appear in MY SYSTEM. In other words, they must be peripheral devices connected directly to the PC, such as USB, serial, or PCI Express. BUT IF IT USES AN IP ADDRESS, IT WILL APPEAR IN REMOTE SYSTEMS.
Finally, I decided to test with a small NI-MyDAQ acquisition card that uses USB communication. The card appeared in NI MAX > MY SYSTEM. I was indeed able to use the nidaqmx library and Python code to interact with its inputs and outputs.

THEREFORE, I would like your HELP in finding a way to use Python to control the I/O of my cRio9056 and PXIe 8842 devices, and not rely on LabVIEW.
As I mentioned earlier, these devices have an IP address and use Ethernet communication.

Thank you in advance for your responses.

[ZYOng]

Use ni/grpc-device: gRPC server providing remote access to NI device driver APIs.

Install the gRPC server to your RT target, then you can run gRPC client Python API on the host.

[AlexJ.]

cRIOs and RT PXI controllers are stand-alone targets, they run their own operating system (NI Linux RT nowadays) which is why you can't run a python script in your Windows PC and expect to get outputs from them. What you'll do is run the scripts on these targets, by remoting into them, downloading python and running the scripts either from the terminal or setting them up as start-up scripts. 

See:

Text-Based Programming on CompactRIO Hardware - NI

Accessing the Shell on NI Linux Real-Time Devices - NI

(my preferred SSH client is MobaXterm free Xserver and tabbed SSH client for Windows since it also provides a file sharing interface.

You'll to familiarize yourself with Linux terminals and running python in Linux. Note: newer Linux RT images come with Python already installed, just double check the version is the one you need.

Cheers,

AJ

[L.Zakarian]

Hello ElvisMARROQUIN,

Before answering your question, I'd like to provide some context regarding your sentence:

THEREFORE, I would like your HELP in finding a way to use Python to control the I/O of my cRio9056 and PXIe 8842 devices, and not rely on LabVIEW.

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You are basically asking about how to switch from LabVIEW to Python on the NI forum… A tricky situation for me to handle!

Taking this into consideration, here is my answer:

You will find all the documents you need to use Python with LabVIEW or NI hardware on this page of the forum.

If you want more information about the NI-DAQmx Python package, you will find this documentation and a repository hosted on the following GitHub. It also includes all the examples to guide you through the process.

I hope that it will help you.