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<== Date ==> <== Thread ==>
Subject: RE: Optimal way to offer readback of PV from one IOC as a PV within another IOC
From: Mark Rivers via Tech-talk <tech-talk at aps.anl.gov>
To: "Wlodek, Jakub" <jwlodek at bnl.gov>, "tech-talk at aps.anl.gov" <tech-talk at aps.anl.gov>
Date: Thu, 18 May 2023 15:27:11 +0000

Hi Jakub,

 

I would suggest using an ao record in your aggregating IOC.  It should be in Closed Loop mode with a DOL field that specifies a CP link to the remote IOC.  That record gets processed whenever the remote IOC value changes.  That ao record OUT link writes the value to your aggregating IOC using the asynFloat64 interface.  This way you don’t need to worry about Channel Access in your driver.

 

Mark

 

 

From: Tech-talk <tech-talk-bounces at aps.anl.gov> On Behalf Of Wlodek, Jakub via Tech-talk
Sent: Thursday, May 18, 2023 10:10 AM
To: tech-talk at aps.anl.gov
Subject: Optimal way to offer readback of PV from one IOC as a PV within another IOC

 

Hi all,

 

Essentially the use case of this is that I have an IOC that aggregates some signals into a custom data structure and transmits the data live over a TCP/IP socket. Most of the signals are calculated within this IOC itself, but there are two additional ones that I'd like to include that are currently provided by another IOC. For context, the data aggregation IOC is an asynPortDriver, and both signals should be asynFloat64 ao readbacks. What would be the best way to do this? Camonitor/caget events within the readFloat64 method? Or some other solution?

 

Thanks,

Jakub

 

 

References:
Optimal way to offer readback of PV from one IOC as a PV within another IOC Wlodek, Jakub via Tech-talk
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