Re: AAI/AAO database information

[Till Straumann <strauman@slac.stanford.edu>]

Andrew Johnson wrote:
> David Dudley wrote:
> > I've seen references to AAI and AAO records someplace, which I assume
> > are Array Analog Input and Output.  Is support for that put in the
> > device driver?
>
> The aai and aao records are a bit of an anachronism; they're not 
> really used very much, 
FYI. WE do use them at SSRL/SLAC.
> there's no soft or test device support included in Base, and they're 
> not documented anywhere either.
The source is good enough.
>   I think they were contributed by one site a long time ago, and we 
> just haven't got around to removing them yet (they'll be gone if R3.15 
> is ever released).
Has there been a discussion about this? We would be in quite a bit of 
trouble if these are removed.

-- Till
> > I have a condition working with the Multilin control relays, where I
> > need to be able to generate a multiple register output sequence,
> > where the entire sequence is done in a single record. This would fit
> > that perfectly, I think.
>
> Use a waveform record if you want device support where the whole array 
> comes from a CA client.  However if you're going to want to be able to 
> set some individual elements from another record they you'll be much 
> better off writing device support that takes the higher level 
> parameters and combines them into the appropriate array/sequence 
> internally.
>
> - Andrew