MCC Universal Library Python API for Windows
Project description
Info |
Contains a Python API for interacting with Measurement Computing’s Universal Library in Windows. See GitHub for the latest source. |
Author |
Measurement Computing |
About
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 http://www.mccdaq.com/Software-Downloads.aspx to upgrade your version of UL.
mcculw supports only the Windows operating system.
mcculw supports CPython 2.7 and 3.4+.
Installation
Install Python version 2.7, 3.4, or later from https://www.python.org/downloads/ .
Install the latest version of InstaCal from http://www.mccdaq.com/Software-Downloads.aspx .
Install the the MCC UL Python API for Windows (mcculw) and any dependencies using pip:
Open the Windows command prompt: press Win+R, type cmd.exe and press Enter.
Upgrade pip to the latest version by entering the following command:
pip install --upgrade pip
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.
Examples
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.
Usage
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
try:
# 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)
Support/Feedback
The mcculw package is supported by MCC. For support for mcculw, contact technical support through http://www.mccdaq.com/Support.aspx . 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
Documentation is available in the Universal Library Help.
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