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<== Date ==> <== Thread ==>
Subject: RE: Example of using a record field from an external IOC as an INPA link on a calcout record
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: Fri, 12 Apr 2024 18:42:18 +0000

Hi Jakub,

 

Do you have control over the asynPortDriver code?  If so, then I think you can do the following:

 

  • Add a new asynInt32 TRIGGER parameter
  • Add a new bo record myIOC:myTrigger that writes to the TRIGGER parameter
  • The PV in the external IOC can write directly to myIOC:myTrigger to send the trigger.
  • Alternatively myIOC:myTrigger.DOL can contain the name of the external PV where it gets its value.  That link can be set to CP, and it can be changed dynamically at run time.

 

Is this what you are looking for?

 

Mark

 

 

From: Tech-talk <tech-talk-bounces at aps.anl.gov> On Behalf Of Wlodek, Jakub via Tech-talk
Sent: Friday, April 12, 2024 12:17 PM
To: tech-talk at aps.anl.gov
Subject: Example of using a record field from an external IOC as an INPA link on a calcout record

 

Hello all,

 

I am currently working on an interesting setup where I would like to use an external signal (i.e. PV from another IOC) within an asynPortDriver to trigger certain behavior (basically as a way to simulate hardware triggers for a device that does not allow for them).

 

Could anyone point me to an example database that can do something like this? I was thinking of having the external signal be either a binary or scalar signal - and write some logic for "triggering" based on rising/falling edge when using the binary signal, or with simple start/gate/step for scalars.

 

Also, if possible, rather than specifying the trigger source PV name as an environment variable at IOC boot, I'd be interested in being able to adjust the PV name for this INLINK dynamically, i.e. from another record in the database. I was thinking of using a stringout and an scalcout that will compose the string with the CP/NMS modifiers for INPA dynamically. Is this actually possible or is the CA link only made at iocInit()?

 

Thanks,

Jakub

 

 

 

 

References:
Example of using a record field from an external IOC as an INPA link on a calcout record Wlodek, Jakub via Tech-talk
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