Hey Yann,
as for the AO record: The initialization failes, because the "Quality"
of the iseg items returns 000 (=ISEG_ITEM_QUALITY_INVALID)
Maybe the module you are using does not support setting the RampSpeed
and thus the isegHal return INVALID qualtiy for it.
That would explain, why it is the only record producing this error.
As for the output recrods being monitored via the polling thread:
The isegHAL offers multiple interfaces to the outside world, like the
EPICS interface (devIsegHal), the browser-based frontend from ISEG,
and some others. So Voltages/Currents and all other configurations can
be changed outside of EPICS and we wanted to have a way,
that our EPICS records stay "synced" with the settings of the module.
It can be quite confusing, when the measured voltage is 0 although the
set voltage is 1.2kV and the setOn bit is set in EPICS (but not in the
module).
Or why the set voltage shows 1.2kV but the HV only goes up to 1.0kV
(because someone set Vset to 1.0kV via another interface).
Unfortunately I cannot answer your question about Qt.
Personally I do not use Qt in any of my own projects and we usually use
the IOCs running on the crate controllers for our isegHV modules.
With them we never had this issue.
Best regards,
Florian
Am 28.05.2023 um 23:13 schrieb Yann Mandza via Tech-talk:
Hello all,
I have a ICSMINI 2 box from iseg am trying to interface to via the HAL
services utilities using HAL service libraries from iseg, I was able
to recompiled for my system.
So far I tried to connect to the box using the provided example and it
worked.
However I tried the epics module from florian
https://github.com/ffeldbauer/devIsegHal
<https://github.com/ffeldbauer/devIsegHal>, so i could disable the
embedded IOC and run mine outside.
I was able to compiled the module and get the IOC connected to the
box. However I’m having two main issues.
1 - error at record initialization for AO record
ISEG:7200081:0:32:VoltageRampSpeed: Error while reading item property
'0.32.VoltageRampSpeed' (Q: 000)
recGblRecordError: ao: init_record Error (514,11) PV:
ISEG:7200081:0:32:VoltageRampSpeed ( is this a result from the above?
Then sorting out the above should clear this error)
it’s strange because only AO return this error.
I read on the deviseghal GitHub page that AO record were added to the
polling thread that also handle I/O interrupt.
I wonder why that would be?
This excerpt is from the page
“It is possible that control parameters change during operation. For
example, if a trip occurs the corresponding setON bit in the channel
control register will be set to 0.
These changes are monitored by devIsegHal through a polling thread.
Each output record (except for stringout records) is automatically
registered to this thread and their values are checked for updates on
the isegHAL.
If a value has changed the VAL field and timestamp of the record will
be set to the new values”
I’m a bit confused why output record would need that.
2- Qt Socket Library return this warning “QSocketNotifier: Socket
notifiers cannot be enabled or disabled from another thread", it seems
the IOC starts several threads to read/write information to the iseg
system.
One can trace this issues till the writeReadSynchronous method within
the isegHal-service library. I used QT5 to compile the library.
Can the device support protect against this or should iseg update
their code to handle multi thread access to the socket?
Regards,
Yann
