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

Subject: Re: A multiway switch record for the new switchable links.
From: mooney@aps.anl.gov (Tim Mooney)
To: tech-talk@aps.anl.gov, npr@jach.hawaii.edu
Date: Wed, 9 Oct 1996 14:19:52 -0500
> From npr@jach.hawaii.edu (Nick Rees)
>...
> 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.
> ...
> Anyway, has anyone thought about something along these lines? Has anyone
> got anything to add?

A switch record would be a convenient mechanism for connecting
predetermined sets of inputs and outputs (but that was already possible
in 3.12).  I think we also need simple improvements in existing records
to take better advantage of 3.13 links.  If the existing Select and
Sequence records could handle strings, they'd be a lot more useful in
databases to support link manipulation, and they'd give you the raw
materials from which you could build a multiway, multipole switch.

Even better, I think, would be a string-manipulation record: suppose I
need to connect some calculations to any of, say, 50 motors.  I'd want
to poke to the drive field "motorX.VAL", read from the readback field
"motorX.RBV", and monitor the done-moving field "motorX.DMOV".  I'd
like to let the user type in, say, "motor38", and have a database that
would make all three connections.  To do this, I'd need to write a
string-manipulation record, but I'd like to use standard EPICS records
to distribute the resulting PV names.

Tim


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