RE: Detecting EPICS record processing

[<nick.rees@diamond.ac.uk>]

Hi Jan,

If you have a Channel access link on IOC:B monitoring blackbox:A and set MDEL on blackbox:A to a value < 0, then a channel access monitor will occur every time blackbox:A processes, which will cause IOC:B to process.

This assumes that blackbox:A is an analog record, of course.

There are other ways, but this is one of the most common.

Cheers,

Nick Rees
Principal Software Engineer           Phone: +44 (0)1235-778430
Diamond Light Source                  Fax:   +44 (0)1235-446713


-----Original Message-----
From: tech-talk-bounces@aps.anl.gov [mailto:tech-talk-bounces@aps.anl.gov] On Behalf Of Jan Malec
Sent: 24 June 2015 09:12
To: tech-talk@aps.anl.gov
Subject: Detecting EPICS record processing

Dear EPICS developers/users!

I've been using EPICS for almost two years and there has been a number 
of occasions when I've seen a need for this solution, but I have always 
found a way around it. However, I would really like to know a good 
solution exist.

Setup:
Let's suppose that we have a black box device that hosts EPICS records 
and we can't modify its EPICS database.
This device hosts a record "blackbox:A".
On another IOC, we would like to process a record "IOC:B" every time a 
"blackbox:A" processes, even if it doesn't change value.
My idea was that I could somehow detect a change in "blackbox:A.PACT" 
and trigger an interrupt, but I just can't get it to work.
Has anyone tried to solve this situation before?

Best regards,
Jan Malec

-- 
Jan Malec
Software developer
Cosylab d.d.

Phone: +386 40 671 246
Web: http://www.cosylab.com


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