Experimental Physics and
Industrial Control System

"Jiro Fujita" <[email protected]> · Wed, 22 Oct 2008 16:44:49 -0500

We have IOC read data from text files at STAR experiment at Brookhaven
National Lab.  We do something very similar to what Andreas suggested.
In our case, the script it attached to cron to automate the task
instead of making it run every so many seconds.  The down side of
having cron deal with that is that we can only run once every minutes,
but for what we are interested, that's fast enough.
We also pass the input file via sed to make sure the right field goes
to the right PV (our input files contains multiple values that needs
to go multiple PVs).

On Wed, Oct 22, 2008 at 2:43 AM, Luedeke Andreas <[email protected]> wrote:
> Pierrick Hanlet wrote on 21.10.2008 22:00:
>> [...] Until the hardware is all in place, I can use my simple setup to develop my
>> edm panels, etc.  Does anyone have advice, or preferably working examples,
>> of code that reads files from into ioc and the ioc writes the data to the database?
>>
> Hi Pierrick,
> You just want to have your records change in a given sequence to test
> your graphical user interfaces?
>
> Then don't do it on the IOC, use a shell script instead that reads the
> data from the file and write it with "caput".
> E.g. if you have the file format: <channel> <value> <delay> in your
> file, you could use the shell script:
>
>    #!/bin/sh
>    while true
>    do
>        read channel val delay
>        if [ $? -ne 0 ]; then break ;fi
>        caput $channel $val
>        if [ $delay -gt 0 ] ;then sleep $delay;fi
>    done
>
> If you name the script "fileput" and your data file "data" you call it
> "fileput <data".
> Of course you need to have the location of the binary of 'caput' in your
> PATH, it's part of EPICS base.
>
> Regards
> Andreas
>
> --
> Dr. Andreas Luedeke, SLS Operations Manager, Tel:+41-56-3104002
> [email protected], http://people.web.psi.ch/luedeke
>
>

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System