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Channel Access in Matlab

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Channel Access in Matlab. What is matlab?. Matlab is a programming language designed for data analysis. It comes with an integrated development environment. Includes help, debugging and some GUI functionality. It can be extended with self written functions and libraries.

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Channel Access in Matlab

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  1. Channel Access in Matlab Advanced EPICS Training, Dirk Zimoch 2008

  2. What is matlab? • Matlab is a programming language designed for data analysis. • It comes with an integrated development environment. • Includes help, debugging and some GUI functionality. • It can be extended with self written functions and libraries. • We provide an EPICS interface for matlab. • Support from the controls section is only rudimentary. Advanced EPICS Training, Dirk Zimoch 2008

  3. EPICS access in matlab • Start matlab: matlab • Read value caget 'ARIDI-PCT:CURRENT' • returns structure: val, sevr, stat, time, sevr_str, stat_str, time_str • status, severity, timestamp available as numbers and as strings • Write value caput 'channel', value • Create monitor is not yet supported. Advanced EPICS Training, Dirk Zimoch 2008

  4. Problems with matlab and EPICS • Why do I get "Undefined function or method 'caget'"? • Check environment variable MATLABPATH echo $MATLABPATH /usr/local/epics/extensions/mca:/usr/local/epics/extensions/lib/SL3-x86 • Check that EPICS is installed in /usr/local/epics. • Why does matlab sometimes crash on exit after using EPICS? • I don't know, but it seems to be harmless. • Why is the timestamp wrong by 1 or 2 hours? • IOC time is UTC, not local (summer) time. • I don't know how to handle time zones in matlab. Do you? Advanced EPICS Training, Dirk Zimoch 2008

  5. Where can I learn more about matlab? • Start matlab and click on MATLAB help • Look at www.mathworks.de • Ask one of the matlab experts • Thomas Schilcher • Mirek Dach • For the basic matlab-EPICS interface see ics-web1.sns.ornl.gov/~kasemir/mca • For the caget, caput, camon wrapper functions ask • Dirk Zimoch Advanced EPICS Training, Dirk Zimoch 2008

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