1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 <2019> 2020 2021 2022 2023 2024 | Index | 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 <2019> 2020 2021 2022 2023 2024 |
<== Date ==> | <== Thread ==> |
---|
Subject: | pyepics callback |
From: | Alfio Rizzo via Tech-talk <[email protected]> |
To: | "[email protected]" <[email protected]> |
Date: | Mon, 9 Sep 2019 13:24:39 +0000 |
Hi I made a simple python script to get the updated value of my PV with a simple callback function : import epics import time def onChanges(**kw): print ('PV Changed! ', kw["pvname"], kw["value"], kw["units"], time.ctime()) mypv = epics.PV("TCU6:RF") mypv.add_callback(onChanges) while True: pass The issue is that the unit is shown as None even if it defined in the .db PV Changed! TCU6:RF -39.69 None Mon Sep 9 15:03:58 2019 PV Changed! TCU6:RF -39.73 None Mon Sep 9 15:03:59 2019 PV Changed! TCU6:RF -39.71 None Mon Sep 9 15:04:00 2019 PV Changed! TCU6:RF -39.7 None Mon Sep 9 15:04:01 2019 PV Changed! TCU6:RF -39.67 None Mon Sep 9 15:04:02 2019 But if I add this line on the script before to add the callback …… mypv.units mypv.add_callback(onChanges) …… Then when I restart the script it shows the unit correctly PV Changed! TCU6:RF -39.79 dBm Mon Sep 9 15:04:31 2019 PV Changed! TCU6:RF -39.71 dBm Mon Sep 9 15:04:32 2019 PV Changed! TCU6:RF -39.69 dBm Mon Sep 9 15:04:33 2019 Is this a bug/feature or I am doing something wrong ? Thanks Best PhD Alfio Rizzo Control System Integrator Integrated Control Systems Division European Spallation Source ERIC Telephone: +46(0)721792342 Mail Address: P.O Box 176, SE 221 00 Lund, Sweden Visiting address: Odarslövsvägen 113, Lund https://europeanspallationsource.se/ |