Re: how to issue a shell command from EPICS record ?

[Pavel Maslov <pavel.masloff@gmail.com>]

Or you can use asynSSH module [1] from Observatory Sciences.

[1] http://www.observatorysciences.co.uk/downloads/asynSSH_EPICS_Developers_Manual_V1-0.pdf

Regards,
Pavel Maslov, MS

oPAC fellow at Cosylab

On Wed, Oct 2, 2013 at 3:00 AM, Konrad, Martin <konrad@frib.msu.edu> wrote:

Hi Christian,

> Now i want to add one more thing: Before the scan starts, i have to
> start the DAQ system with a certain BASH shell-script, after the scan i
> have to stop the DAQ with another shell script.

Hmm, this does not really seem to be the cleanest way to do this. But
here are some ideas:

1. Use subroutine record [1] to execute a short C function including a
system() call running bash.
2. Use sequencer [2]. You can use C code in state notation language.
Again a system() call should do the job.
3. Modify the other end (your DAQ) to add a Channel Access server. This
way you can switch your DAQ on/off as well.

Cheers,

Martin

[1] https://wiki-ext.aps.anl.gov/epics/index.php/RRM_3-14_Subroutine
[2] http://www-csr.bessy.de/control/SoftDist/sequencer/

--
Martin Konrad
Control System Engineer
Facility for Rare Isotope Beams
Michigan State University
640 South Shaw Lane
East Lansing, MI 48824-1321, USA
Tel. 517-908-7253
Email: konrad@frib.msu.edu