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MCC Universal Library Python API for Windows

Project description

Info Contains a Python API for interacting with Measurement Computing’s Universal Library. See GitHub for the latest source.
Author Measurement Computing


The mcculw package contains an API (Application Programming Interface) for interacting with the I/O Library for Measurement Computing Data Acquisition products, Universal Library. This package was created and is supported by MCC. The package is implemented in Python as a wrapper around the Universal Library C API using the ctypes Python Library.

mcculw is supported for Universal Library 6.55 and later. Some functions in the mcculw package may be unavailable with earlier versions of Universal Library. Visit to upgrade your version of UL.

mcculw supports only the Windows operating system.

mcculw supports CPython 2.7 and 3.4+.

The mcculw package is available on GitHub and PyPI.


  1. Install Python version 2.7, 3.4, or later from .

  2. Install the latest version of InstaCal from .

  3. Install the the MCC UL Python API for Windows (mcculw) and any dependencies using pip:

    1. Open the Windows command prompt: press Win+R, type cmd.exe and press Enter.

    2. Upgrade pip to the latest version by entering the following command:

      pip install --upgrade pip
    3. Install the mcculw library by entering the following command:

      pip install mcculw

    Note: If you get a message like “pip is not recognized as an internal or external command…”, or if you have multiple Python installations, enter the full path to the pip executable, such as C:\Python27\Scripts\pip install –upgrade pip or C:\Python27\Scripts\pip install mcculw. The pip command is in the Scripts subdirectory of your Python install location.


Download the examples zip file from the mcculw GitHub repository.

Unzip the examples to a known location, such as:

C:\Users\Public\Documents\Measurement Computing\DAQ\Python

Refer to the knowledgebase article Importing Python for Windows example programs into an IDE for detailed instructions on how to import examples into popular IDEs such as Eclipse and Visual Studio.


The following is a basic example of using the Universal Library to perform analog input. Further examples may be found on GitHub.

from mcculw import ul
from mcculw.enums import ULRange
from mcculw.ul import ULError

board_num = 0
channel = 0
ai_range = ULRange.BIP5VOLTS

    # Get a value from the device
    value = ul.a_in(board_num, channel, ai_range)
    # Convert the raw value to engineering units
    eng_units_value = ul.to_eng_units(board_num, ai_range, value)

    # Display the raw value
    print("Raw Value: " + str(value))
    # Display the engineering value
    print("Engineering Value: " + '{:.3f}'.format(eng_units_value))
except ULError as e:
    # Display the error
    print("A UL error occurred. Code: " + str(e.errorcode)
          + " Message: " + e.message)


The mcculw package is supported by MCC. For support for mcculw, contact technical support through . Please include version information for Python, Universal Library and the mcculw packages used as well as detailed steps on how to reproduce the problem in your request.

Bugs/Feature Requests

To report a bug or submit a feature request, please use the mcculw GitHub Issues page.


Documentation is available in the Universal Library Help.


mcculw is licensed under an MIT-style license. Other incorporated projects may be licensed under different licenses. All licenses allow for non-commercial and commercial use.

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