Re: initialize of mbbi state labels

["Bob Dalesio" <ldalesio@lanl.gov>]

I would put it into the device support initialization area 
-
It can be done at initiallization.

Device support has a pointer to the record - so it's able 
to write directly into the fields ZNAM, ONAM, etc.... 

At initialization, there should be no channel access 
clients connected that could request these strings before 
they are initialized.

A problem would be if the assignment of these values can 
change. Channel access clients monitor the value as a 
short and only send the string assignments at connection 
time. So that is a possible problem. If they can change - 
you may want to map them from a static assigment to the 
dynamic values in the device support only - and not export 
the fact that the strings are assigned different values at 
different times.


On Mon, 03 Mar 2003 15:29:32 -0500
 "Hoff, Lawrence" <hoff@bnl.gov> wrote:
> 	EPICS philosophical question of the day........
>
> 	Suppose there is a piece of equipment which can be put 
> into
> one of several modes of operation. Suppose also that the 
> set of possible
> modes depends on the hardware configuration of the 
> equipment. Suppose
> finally that the set of possible modes can be queried 
> programmatically.
>
> 	What is the "best" way to populate the "ZRST", "ONST", 
> ...
> fields of the record?
>
> 	Query the device during the "record init" phase, and
> programmatically fill in the fields?
>
> 	Edit the .db file to conform to the known H/W 
> configuration,
> and re-edit as needed if the H/W changes?
>
> 	Other?
>
> 	What are pros and cons of various approaches.
>
> 	One example of such H/W are certain frame grabbers which 
> have
> H/W image processing built onto daughter cards. There are 
> different
> sets of image processing algorithms available with 
> different daughter
> cards attached.
>
> 	Another example is a transient recorder with options for
> stored waveform length, which are ultimately constrained 
> by the amount
> of memory installed.
>
> -- Larry

Bob Dalesio
ldalesio@lanl.gov
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