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

Subject: Re: A multiway switch record for the new switchable links.
From: nda@aps.anl.gov (Ned Arnold)
To: tech-talk@aps.anl.gov, npr@jach.hawaii.edu, wbrown@csg.lbl.gov
Date: Tue, 8 Oct 1996 17:05:09 -0500
 
> npr@jach.hawaii.edu (Nick Rees) sez:
> 
> > I have been using R3.13.0 alpha 5 for a while now, and even had
> > occasion to use the switchable links. What we appear to need now is a
> > switch record, and probably a multipole, multiway switch record.
> > 
> > I have thought a bit about how this could work. Take the example of a
> > single pole multiway switch which can make a single input link switch
> > between a number of fields. Ideally it would appear on the database
> > diagram as connected on its input side to the multiple fields it is
> > switching between, and connected on the other (output) side to the
> > single input link. There would be a multiple choice selection mechanism
> > like the mbb records to select which field the input link refers to.
> 
> Hmmmm - the hardware term that come to mind is "mux" (multiplexer).
> To be complete, a "de-mux" would also seem to be appropriate.
> 
> One could probably bash someting together as a proof of principal using
> a subroutine record.
> 
> Oh, what tangled paths we weave.....
> 
> -bill


The SELECT record that is included in standard EPICS can be used as a mux.

	Ned
	


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