Experimental Physics and Industrial Control System
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Hi Deeptarka,
EPICS V4 basically is a library around user-defined hierarchical
data structures (pvData) and a network protocol to transport those
structures (pvAccess). There are Java and C++ implementations of
server and client, examples, lots of documentation, etc. [1]
There are no changes in the IOC.
Except for a pvAccess server for the IOC (pvaSrv) that can be loaded
and started on an existing 3.14 IOC, and allows accessing the PVs on
that IOC using the pvAccess network protocol.
If you are looking for ways to insert your own C/C++ code into the
IOC's record processing, you should look at the subroutine record
[2] and array subroutine record [3]. These record types are made to
allow exactly that. Writing device support is another option that
would run your code as part of the record processing. Writing ASYN
interpose modules or port drivers would run your code as part of the
low-level driver, "underneath" the database records, possibly in the
context of a driver thread.
Using the sequencer is the most loosely coupled approach - as there
is Channel Access between the database and your code in the state
machine that runs in a separate sequencer thread.
Cheers,
~Ralph
ps. EPICS 3.15 has some new features (e.g. long string record types)
that might be interesting for you.
[1] http://epics-pvdata.sourceforge.net/
[2] https://wiki-ext.aps.anl.gov/epics/index.php/RRM_3-14_Subroutine
[3]
https://wiki-ext.aps.anl.gov/epics/index.php/RRM_3-14_Array_Subroutine
On 02/01/2015 12:02, Deeptarka
Das/TVM/TCS wrote:
Hi all,
I have some applications created with EPICS 3.14. These
applications have mainly waveform records(I needed to store
lon strings), subroutine records, Sequencer for state
handling(I had also "mis-used" it for some data processing
work) and Asyn. I am trying to evaluate EPICS 4.4 (CPP).
Till now I have understood that even with version 4.4, I
will be using the same IOCs created with 3.14. So my
question is what additional benefits will I get from
migrating to 4.4? I need to perform some heavy data
processing(the reason why I was misusing Sequencer).
With 4.4 will I be able to directly include C++ codes into
the application to do the data processing?
---
Thanks and Regards,
Deeptarka Das
Mailto: [email protected]
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- Replies:
- RE: Need to migrate from 3.14 to 4.4 Mark Rivers
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ANJ, 16 Dec 2015 |
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