Re: Your Message Sent on Thu, 31 Oct 2002 12:25:33 -0800

[Andrew Johnson <anj@aps.anl.gov>]

Jim Thomas wrote:
> > > > > > "Ned" == Ned Arnold <nda@aps.anl.gov> writes:
>
>  Ned> The short answers are ...
>
>  >> From: "Redman, Russell O." <Russell.Redman@nrc.ca>
>  >> My big questions are thus
>  >> 1) Under what circumstances does pushing a value over a CA link cause the
>  >> target record to process? 
>
>  Ned> .... if the destination field is defined as "PP" (with the statement
>  Ned> "pp(TRUE)" in the *.dbd file and so documented under the PP column in
>  Ned> the record reference manual) and the record scan field is set to
>  Ned> "Passive". If these two conditions are true, the record will process
>  Ned> when ANY channel access client (including a sequence programs, CA
>  Ned> links, etc) writes to that field.
>
> So it is a record type property?  There is no way to vary it per record
> instance?

Yes and yes.

> Implication -> more special record types :-(

Not necessarily; if it's important in some particular circumstance to use 
the "other" setting for a field, you can always put an AO or similar 
record in the way with a DB link on its OUT field set to PP or NPP as 
required.  I've never heard of anyone producing a new version of a record 
type just to change a PP setting, although I suppose it could happen...

- Andrew
--
"Life is what happens while you're busy making other plans." - John Lennon