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PYDM: A Python Alternative to EDM

PYDM is a Python-based display manager that provides a flexible and customizable solution for controlling and displaying data in scientific and control systems. This alternative to EDM offers improved support for image handling, color displays, window management, and higher-level application design. With a large development community and existing Python interfaces for IOC applications, PYDM is a powerful tool for creating dynamic and user-friendly displays.

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PYDM: A Python Alternative to EDM

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  1. September 22nd, 2016 PYDM A Python Alternative to EDM Teddy Rendahltrendahl@slac.stanford.edu LCLS Controls & Data Systems Division

  2. Motivation for a new Display Manager • Development Issues • Support for image handling is poor • Unnecessary strain on network • No color displays • Basic client side functionality is non-existent • Higher level application design is time consuming • Hard to customize style • Widget positioning is absolute • User Issues • Window management is difficult • Flexibility between different resolution monitors

  3. Why Python? Python is the most commonly used language among controls , data acquisition/analysis and scientific groups Willing to trade a small amount of performance to leverage a larger development community Python interfaces are already ubiquitous for IOC applications and tools

  4. A Fork in the Road Existing solutions for getting EPICS information in both caQtDM and EPICSQt No choice has Python capabilities Python bindings can be created using SIP for C++ Widgets Automatic conversion scripts in caQtDM • Over 5000 EDM files to convert

  5. Maintenance

  6. Strength in Flexibility Needs to support a dynamic experimental environment Applications can be created in a WYSIWYG editor The option to create screens programmatically Provide a unified Widget set for the existing higher level applications Generate screens procedurally

  7. PYDM Widgets must be source agnostic Contains a flexible plugin based system • Allows for information from data aquisition, Python services, EPICS, and EPICS Archiver Plugins are relatively simple to code • 100 to 200 lines of code Browser-like setup for better Window Management

  8. How it Works Uses pyca for Channel Access • C with Python Interface Utilizes Qt’s signals/slots framework Different data sources with unique interfaces transmit information using a generic ‘PyDM Channel’ • Protocol is selected with a URL like structure • ca:// • arch:// • py://

  9. Current Infrastructure

  10. Future Infrastructure

  11. Deployments : Camera Viewer Already in use for EPICS image displays Monitors dead time to disable forgotten windows Was created before cameras were merged into areaDetector Improvements • Work directly with areaDetector plugins • Include motion for camera zoom and focus

  12. Deployments : Network Switch • Easy to embed other Applications • Information that can be accessible through V4 in the future • Not necessary to create IOC • Created command line interface along with UI • minimal code required • Dynamically created, no changes to source code necessary

  13. Future Developments Limitations need to be quantified • How fast? • How many? Use SIP to introduce caQtDm Widgets Create a flexible camera viewing screen that works directly with areaDetector Begin converting existing screens

  14. Acknowledgements Matt Gibbs Alisha Babbit Zachary Lentz AmedeoPerazzo Dan Flath Alex Wallace Dan Damiani

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