Experimental Physics and
Industrial Control System

S Banerian via Tech-talk <tech-talk at aps.anl.gov> · Tue, 9 May 2023 20:19:55 -0700

I've set to work on upgrading some of our local EPICS infrastructure, and have (finally) installed Epics 7 on a couple of machines.

As part of that, we are trying out pvaccess PvaPy as an update to the pyepics that is currently used.

On a test system, i've been following the documentation [1,2] for PvaPy to monitor some pv's we track.

alas, we do not get the desired behaviour for monitoring CA   PVs.

pvaChannel = Channel('enum01')
pvaChanne.isConnected()
pvaChannel.subscribe('echo', lambda x: print(f'{x}'))
pvaChannel.startMonitor()

(no errors encountered)

but when  non-default is tried: 

ourPVchannel = pvaccess.Channel('int01',CA)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
NameError: name 'CA' is not defined

pvaccess.Channel('int01',providerType=CA)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
NameError: name 'CA' is not defined

suggestions as to what I can try next?

[1] https://github.com/epics-base/pvaPy
[2] https://epics.anl.gov/extensions/pvaPy/production/pvaccess.html#channel

s banerian
UW Clinical Cyclotron

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System