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

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Presentation transcript:

Advanced EPICS Training, Dirk Zimoch 2008 Channel Access in Matlab

Advanced EPICS Training, Dirk Zimoch 2008 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. ► We provide an EPICS interface for matlab. ■ Support from the controls section is only rudimentary.

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