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| <== Date ==> | <== Thread ==> |
|---|
| Subject: | Re: Problem in running simple tutorial problems |
| From: | Jan Cedric Hönig <[email protected]> |
| To: | "Matt Newville" <[email protected]> |
| Cc: | EPICS Tech Talk <[email protected]> |
| Date: | Tue, 08 Mar 2016 14:09:59 +0100 |
Hi all,I should mention again I have no prior experience in working with epics or any server.
So my naive first thought was that:
In [1]: import epics
In [2]: p = epics.PV('LargeWaveform')
should start a server and create the PV, which is apparently not the
case...?
So I started a "SimpleServer" using PCASpy. But here all PVs need to be defined before starting the server (correct?)? I was able to modify the data in these pre defined PVs with pre defined array sizes. Yet I want to be able to store arrays of unknown/changing size in these PVs!
! So to sum up:How do I start an epics server? Is it possible to create PVs during operation/how? How do I store arrays of arbitrary size in them?
!From what I gather from the wiki all this should be possible, but I seem to be missing a step...
(I'm working locally so firewall should not be an issue for now...) Thanks in advance, Jan On Mon, 7 Mar 2016 10:44:45 -0600 Matt Newville <[email protected]> wrote:
Hi Jan, On Mon, Mar 7, 2016 at 7:43 AM, Jan Cedric Hönig < [email protected]> wrote:Hi, I'm planning to use epics, but I"m stuck right at the beginning. I work on scientific linux 6 so first I start python: ipython Python 2.7.5 (default, Jun 5 2014, 14:38:05) Then I try simple epics commands: In [1]: import epics In [2]: p = epics.PV('LargeWaveform') In [3]: p.connectOut[3]: <bound method PV.connect of <PV 'LargeWaveform': not connected>>But I am unable to connect any of my PVs. Am I doing something wrong?'connect' is a method of a PV. To run this method, add parens: p.connect()The connection should happen automatically and soon, so that you don't needto explicitly run the connect method, and can just access the data: p.get()You can also checked the value of `p.connected`, which will be True once(and if) the PV is connected. --Matt