Re: Listen to multiple events

[Korhonen Timo <Timo.Korhonen@psi.ch>]

Allison, Stephanie wrote:
> Hi Dehong,
>
>   
> > Can one EPICS record listen to more than one event?  If yes, how could set it up?
> >     
>
>   
An alternative method to the forward links is to use the "soft" event scan.
For that, Stephanie's example would need the following modification:

the VAL field of the event records define the soft event number that is 
dispatched. They should be
set to the same number. The ai record could then look like this:

record(ai, "Test:RecordToProcessOnEvent1or2") {
 field(SCAN, "Event")
 field(EVNT, "1")   
#EVNT is the soft event number

...other ai fields here...
}

This way you do not have to FLNK to each record, and there are also 
other possibilities
to dispatch the events, like from a calcout record (using OEVT and 
OOPT). Usually  this is
much more flexible method for the applications.

(One point to note: if you need deterministic (real-time) behaviour, the 
PRIO field
of the records should be set to HIGH.)


best regards,

Timo
> Do you mean can one record be processed on different events?  If that is what you mean, then you could FLNK to the record from both event records.  For instance, if I have 2 EVR event records (for EVR card 0), I could FLNK to the same record from both of them like this:
>
> record(event, "Test:Event1") {
>   field(DTYP, "MRF Event Receiver")
>   field(INP, "#C0 S1 @")
>   field(SCAN, "I/O Intr")
>   field(VAL, "1")
>   field(FLNK, "Test:RecordToProcessOnEvent1or2")
> }
> record(event, "Test:Event2") {
>   field(DTYP, "MRF Event Receiver")
>   field(INP, "#C0 S2 @")
>   field(SCAN, "I/O Intr")
>   field(VAL, "2")
>   field(FLNK, "Test:RecordToProcessOnEvent1or2")
> }
> record(ai, "Test:RecordToProcessOnEvent1or2") {
>   field(SCAN, "Passive")
> ...other ai fields here...
> }
>
> Stephanie Allison
>
>
>
>   


--
Timo Korhonen  PSI (Paul Scherrer Institut, http://www.psi.ch) 
              CH-5232 Villigen PSI 
              tel + 41- 56 3103262  fax + 41 - 56 310 3383 
e-mail:	       timo.korhonen@psi.ch