Experimental Physics and
Industrial Control System

"Jeff Hill" <[email protected]> · Tue, 10 Jun 1997 16:11:43 -0600

> HOWEVER,
> 
> The biRecord.c support code is not incorrect because there get_enum_str,
> put_enum_str, get_enum_strs will ONLY get called if the field type
> in question is DBF_ENUM. The only such field in the biRecord is VAL.
> Many record support modules in base make this assumption.
> 

Yes, but PV values in the CA server monitor queue will be ignored in favor
of the current value in the record if we leave the code as it is today.
Therefore, clients that monitor the .VAl field of a bo record as a
string will see the sequence of events "on off on" converted
to "on on on" if the events are spaced closely together in time.

Explanation:
This is because, when dbGetField() is called, the dbAddr structure 
is pointing at the value on the CA monitor queue and not at the 
.VAL field. The bo record's get_enum_str() routine ignores the 
dbAddr structure passed in and always converts  the VAL field
to a string (returning the current and not the historic value of
the .VAL field).

Jeff

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System