Experimental Physics and
Industrial Control System

Mark Rivers via Tech-talk <tech-talk at aps.anl.gov> · Fri, 14 May 2021 12:59:51 +0000

Another thing to try is this command

dbpr EPICSLinkRecord 2

where EPICSLinkRecord is the name of the EPICS record you are using the monitor the status of the link from EPICS to your middle

 layer.

Mark

________________________________
From: Tech-talk <tech-talk-bounces at aps.anl.gov> on behalf of Mark Rivers via Tech-talk <tech-talk at aps.anl.gov>
Sent: Friday, May 14, 2021 7:24 AM
To: Iain Marcuson
Cc: EPICS Tech-Talk
Subject: Re: Testing EPICS link status

If I understand correctly you are sure that the SDEPICSLinkStatus parameter is being set to 0 when it should be, but the corresponding EPICS PV is not zero? If so then perhaps you are not calling callParamCallabacks()?

Mark

Sent from my iPhone

On May 13, 2021, at 12:58 PM, Iain Marcuson via Tech-talk <tech-talk at aps.anl.gov> wrote:

In my AreaDetector setup I have EPICS <-> Middle Layer <-> Camera.  I need to report on the link status between EPICS and the middle layer (EPICS link), and between the middle layer and the camera (camera link).  For the camera link, I have a polling EPICS PV to query the middle layer for the camera link status, and this works.  For the EPICS link, my thought was to use the polled query’s status as an indication of the EPICS link status e.g. through a return value of the asyn write of asynDisconnected, as shown in the code below:

if ((asynDisconnected == ret) || (asynTimeout == ret)) //Assume link down
    {
      setIntegerParam(SDEPICSLinkStatus, 0);
    }
  else if (ret != -1) //Assume link up, but don't change status if variable not found
    {
      setIntegerParam(SDEPICSLinkStatus, 1);
    }

I have verified that I get a return value of asynDisconnected, but the EPICS link status is never set to zero.  The else clause does execute and set the PV to 1, so the PV and asyn seem to be programmed right.  Is there a connection issue I am missing, org should I just use dbNameToAddr() or similar to set the value to zero, as opposed to going through asyn?

Thank you,

Iain Marcuson
Software Engineer, Sydor Technologies
585.278.1168 | www.SydorTechnologies.com<http://www.SydorTechnologies.com<http://www.SydorTechnologies.com<http://www.SydorTechnologies.com>>
Skype: iain.marcuson at sydorinstruments.com

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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System