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<== Date ==> <== Thread ==>

Subject: Delays in seq records
From: Ralph Lange <Ralph.Lange@aps.anl.gov>
To: Tim Graber <graber@cars.uchicago.edu>
Cc: EPICS Tech-Talk <tech-talk@aps.anl.gov>
Date: Fri, 16 Feb 2001 12:50:15 -0600 (CST)
  > If a user makes a mistake and wants to restart the process, the time he/she
  > needs to wait for the record to finish processing can be too long. My
  > question is, once the record is executed is there a way to stop the record
  > from processing or reset it. 

Tim,

the record sets up watchdog timers to do the delayed processing. There
is currently no easy way to cancel the operation of a seq record once
you pushed the button.

(You could of course look at the seq record code and write a function to
be used within a subroutine record that cancels the timer and resets the
seq record to a usable state. That would not be a good design neither
easy to do, though.)

(Or you could add this functionality to the seq record. I'm sure there
are other people who would appreciate this.)

I would switch to using the sequencer with a state machine that looks
for a "cancel" bo record. When the sequences are rather long or
complicated and don't need many instances, the sequencer is the better
tool.

Good luck!

Ralph



References:
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