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-->If you want to connect IoT devices that use Modbus TCP or RTU protocols to an Azure IoT hub, you can use an IoT Edge device as a gateway. The gateway device reads data from your Modbus devices, then communicates that data to the cloud using a supported protocol.
This article covers how to create your own container image for a Modbus module (or you can use a prebuilt sample) and then deploy it to the IoT Edge device that will act as your gateway.
This article assumes that you're using Modbus TCP protocol. For more information about how to configure the module to support Modbus RTU, see the Azure IoT Edge Modbus module project on GitHub.
Prerequisites
- An Azure IoT Edge device. For a walkthrough on how to set up one, see Deploy Azure IoT Edge on Windows or Linux.
- The primary key connection string for the IoT Edge device.
- A physical or simulated Modbus device that supports Modbus TCP. You will need to know its IPv4 address.
Prepare a Modbus container
If you want to test the Modbus gateway functionality, Microsoft has a sample module that you can use. You can access the module from the Azure Marketplace, Modbus, or with the image URI,
mcr.microsoft.com/azureiotedge/modbus:1.0
.If you want to create your own module and customize it for your environment, there is an open-source Azure IoT Edge Modbus module project on GitHub. Follow the guidance in that project to create your own container image. To create a container image, refer to Develop C# modules in Visual Studio or Develop modules in Visual Studio Code. Those articles provide instructions on creating new modules and publishing container images to a registry.
Try the solution
This section walks through deploying Microsoft's sample Modbus module to your IoT Edge device.
- On the Azure portal, go to your IoT hub.
- Go to IoT Edge and click on your IoT Edge device.
- Select Set modules.
- In the IoT Edge Modules section, add the Modbus module:
- Click the Add dropdown and select Marketplace Module.
- Search for
Modbus
and select the Modbus TCP Module by Microsoft. - The module is automatically configured for your IoT Hub and appears in the list of IoT Edge Modules. The Routes are also automatically configured. Select Review + create.
- Review the deployment manifest and select Create.
- Select the Modbus module,
ModbusTCPModule
, in the list and select the Module Twin Settings tab. The required JSON for the module twin desired properties is auto populated. - Look for the SlaveConnection property in the JSON and set its value to the IPv4 address of your Modbus device.
- Select Update.
- Select Review + create, review the deployment, and then select Create.
- Return to the device details page and select Refresh. You should see the new
ModbusTCPModule
module running along with the IoT Edge runtime.
View data
View the data coming through the Modbus module:
You can also view the telemetry the device is sending by using the Azure IoT Hub extension for Visual Studio Code (formerly Azure IoT Toolkit extension).
Next steps
- To learn more about how IoT Edge devices can act as gateways, see Create an IoT Edge device that acts as a transparent gateway.
- For more information about how IoT Edge modules work, see Understand Azure IoT Edge modules.
Released:
Easy-to-use Modbus RTU and Modbus ASCII implementation for Python
Project description
Easy-to-use Modbus RTU and Modbus ASCII implementation for Python.
Web resources
- Documentation: https://minimalmodbus.readthedocs.io
- Source code on GitHub: https://github.com/pyhys/minimalmodbus
- Python package index (PyPI) with download: https://pypi.org/project/MinimalModbus/
Other web pages:
- Readthedocs project page: https://readthedocs.org/projects/minimalmodbus/
- Travis CI build status page: https://travis-ci.org/pyhys/minimalmodbus
- codecov.io project page: https://codecov.io/github/pyhys/minimalmodbus
Obsolete web pages:
- Old Sourceforge documentation page: http://minimalmodbus.sourceforge.net/
- Old Sourceforge project page: https://sourceforge.net/projects/minimalmodbus
- Old Sourceforge repository: https://sourceforge.net/p/minimalmodbus/code/HEAD/tree/
Features
MinimalModbus is an easy-to-use Python module for talking to instruments (slaves)from a computer (master) using the Modbus protocol, and is intended to be running on the master.The only dependence is the pySerial module (also pure Python).
There are convenience functions to handle floats, strings and long integers(in different byte orders).
This software supports the ‘Modbus RTU’ and ‘Modbus ASCII’ serial communicationversions of the protocol, and is intended for use on Linux, OS X and Windows platforms.It is open source, and has the Apache License, Version 2.0.
Tested with Python 2.7, 3.5, 3.6 and 3.7.
Support for Python2 will be dropped in 2020.
This package uses semantic versioning.
Release 1.0.2 (2019-08-11)
- Adjusted settings for hardware tests
- Improved developer documentation
Release 1.0.1 (2019-08-10)
- Corrected version number
Release 1.0.0 (2019-08-10)
New features:
- Implements reading and writing multiple bits simultaneously.
- Support more byteorders (endianness) for floats and long integers.
Breaking changes:
- Renamed method arguments ‘numberOfDecimals’, ‘numberOfRegisters’ to‘number_of_decimals’, ‘number_of_registers’
- Removed example drivers for Eurotherm 3500 and Omegacn 7500, as I no longer haveaccess to these instruments for testing. It would great if someone would pickup support for these instruments in a separate project.
- Requires pyserial 3.0 or later.
- Removed module level constants for default values, as they were confusingly named.
Other fixes:
- Allow slave addresses also in the reserved range (up to 255). Reported by GitHub user gnbl.
- Serial port read and write buffers are cleared before each request to the instrument.Pull request from GitHub user mrrs6.
- Check whether the serial port is open before trying to open it. Reported by Matthias Bolte.
- Custom exceptions for Modbus errors, by Russ Garrett.
- Silent period between messages is at least 1.75 ms to fulfill Modbus standard. Reportedby GitHub user draput.
- Use time.monotonic if available. Suggested by Matthias Bolte.
- Implemented write timeout, to avoid hanging when writing. Instead it will raise an exception.Reported by Austin Stover.
- Better checking of number of registers when reading and writing.
- Rename internal methods and variables to be PEP8 compliant.
- Improved documentation.
Release 0.7 (2015-07-30)
- Faster CRC calculation by using a lookup table (thanks to Peter)
- Handling of local echo (thanks to Luca Di Gregorio)
- Improved behavior of dummy_serial (number of bytes to read)
- Improved debug messages (thanks to Dino)
- Using project setup by the cookie-cutter tool.
- Reshuffled source files and documentation.
- Moved source to GitHub from Sourceforge.
- Moved documentation to readthedocs.org
- Using the tox tool for testing on multiple Python versions.
- Using Travis CI test framework
- Using codecov.io code coverage measurement framework
- Added support for Python 3.3 and 3.4.
- Dropped support for Python 2.6.
Release 0.6 (2014-06-22)
- Support for Modbus ASCII mode.
Release 0.5 (2014-03-23)
- Precalculating number of bytes to read, in order to increase the speed.
- Better handling of several instruments on the same serial port, especiallyfor Windows.
- Improved timing for better compliance with Modbus timing requirements.
![Tcp Tcp](http://controltoolbox.com/yahoo_site_admin/assets/images/datasheet.99124235.jpg)
Release 0.4 (2012-09-08)
- Read and write multiple registers.
- Read and write floating point values.
- Read and write long integers.
- Read and write strings.
- Support for negative numbers.
- Use of the Python struct module instead of own bit-tweaking internally.
- Improved documentation.
Release 0.3.2 (2012-01-25)
- Fine-tuned setup.py for smoother installation.
- Improved documentation.
Release 0.3.1 (2012-01-24)
- Improved requirements handling in setup.py
- Adjusted MANIFEST.in not to include doc/_templates
- Adjusted RST text formatting in README.txt
Release 0.3 (2012-01-23)
This is a major rewrite, but the API is backward compatible.
- Extended functionality to support more Modbus function codes.
- Option to close the serial port after each call (useful for Windows XP etc).
- Diagnostic string output available (for support).
- Debug mode available.
- Improved __repr__ for Instrument instances.
- Improved Python3 compatibility.
- Improved validity checking for function arguments.
- The error messages are made more informative.
- The new example driver omegacn7500 is included.
- Unit tests included in the distribution.
- A dummy serial port for unit testing is provided (including recorded communication data).
- Updated documentation.
Release 0.2 (2011-08-19)
- Changes in how to reference the serial port.
- Updated documentation.
Project details
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