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<== Date ==> <== Thread ==>
Subject: odd ASYN behavior
From: "Runchey, John via Tech-talk" <tech-talk at aps.anl.gov>
To: "tech-talk at aps.anl.gov" <tech-talk at aps.anl.gov>
Date: Mon, 14 Mar 2022 16:14:53 +0000
I'm working with a new build of QUADEM for the tetrAMM and seeing a weird asyn issue.

Summary: When writing to the AcquireMode PV, the associated _RBV PV is 'one behind' in reporting the new value, consistently. But if I manually do a caput to the _RBV.PROC field and force it to process, the readback is then consistently correct.

camonitor of the issue:
S28IDFE-XBPM:CM3ds:AcquireMode 03/11/22 09:00:39.158459244 Single
S28IDFE-XBPM:CM3ds:AcquireMode_RBV 03/11/22 09:00:39.158436082 Multiple

S28IDFE-XBPM:CM3ds:AcquireMode_RBV 03/11/22 09:01:23.572226245 Single
S28IDFE-XBPM:CM3ds:AcquireMode 03/11/22 09:01:23.572245721 Continuous

S28IDFE-XBPM:CM3ds:AcquireMode_RBV 03/11/22 09:01:34.876944669 Continuous
S28IDFE-XBPM:CM3ds:AcquireMode 03/11/22 09:01:34.876973666 Multiple

after caput AcquireMode_RBV.PROC 1:
S28IDFE-XBPM:CM3ds:AcquireMode_RBV 03/11/22 09:06:33.097901171 Single
// caput caused _RBV to update to the (correct) value of Continuous
S28IDFE-XBPM:CM3ds:AcquireMode_RBV 03/11/22 09:06:42.683848695 Continuous
S28IDFE-XBPM:CM3ds:AcquireMode 03/11/22 09:06:42.683874661 Continuous

S28IDFE-XBPM:CM3ds:AcquireMode_RBV 03/11/22 09:06:44.284941724 Multiple
S28IDFE-XBPM:CM3ds:AcquireMode 03/11/22 09:06:44.284974097 Multiple

S28IDFE-XBPM:CM3ds:AcquireMode_RBV 03/11/22 09:06:45.876836770 Single
S28IDFE-XBPM:CM3ds:AcquireMode 03/11/22 09:06:45.876854823 Single

This is the first time I've built this on a RHEL 8 machine for what that's worth.

Any thoughts?
Thanks,
John
Replies:
Re: odd ASYN behavior Mark Rivers via Tech-talk
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