Re: camonitor vs caput

[Érico Nogueira Rolim via Tech-talk <tech-talk at aps.anl.gov>]

On 05/12/2023 04:43, Gerrit Kühn via Tech-talk wrote:
> Am Tue, 5 Dec 2023 08:20:05 +0100
> schrieb Gerrit Kühn via Tech-talk <tech-talk at aps.anl.gov>:
>
>> As this works fine with all other records, it looks to me like the
>> scanning field (I/O Intr), maybe in combination with StreamDevice, is
>> causing my trouble here. Is this expected behaviour? How can I achieve
>> that caput changes are recognised by camonitor on I/O Intr records?
> I worked around this by creating an extra dummy record with I/O Intr
> scanning and using redirection for all other channels containing the
> actual data. This gets me the desired behaviour, but I still wonder why
> I/O Intr records behave so differently.


 From [1]:


 > Passive records are processed when they are referenced by other
records through their link fields or when a channel access put is done
to them.


A record must be Passive in order to be *processed* (therefore sending
an event to your camonitor process) when it receives a value write.


I believe a possible workaround would be an auxiliary record(s), first
writing the value and then writing to "$record.PROC CA". I know that
works to force processing for records with periodic scanning, but don't
remember testing with I/O Intr.


[1]
https://docs.epics-controls.org/en/latest/process-database/EPICS_Process_Database_Concepts.html#passive-scanning


Cheers,

Érico


>
>
> cu
>    Gerrit



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