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Subject: RE: asynPortDriver Question
From: "Mark Rivers" <[email protected]>
To: "Szalata, Zenon M." <[email protected]>
Cc: [email protected]
Date: Sat, 26 Mar 2011 18:11:00 -0500
Hi Zen,
 
I don't think you can do that.  The first order problem is that there is no connection from the asyn driver to the AO:SC record, since it uses soft device support, not asyn device support.  I don't think there is a way to propogate alarm status between records at the database level except by using the MS qualifier on input and output links.  But I'm not a database programming expert, perhaps there is a way to do this.
 
But if you want to indicate a problem to the user in the edm screen you can have another widget whose visibility or color is controlled by the AO record's alarm status.
 
Mark
 

________________________________

From: Szalata, Zenon M. [mailto:[email protected]]
Sent: Sat 3/26/2011 2:54 PM
To: Mark Rivers
Cc: [email protected]
Subject: asynPortDriver Question



Hi Mark,

I am using a four record set to write analog data to a set point register in a power supply and to keep reading and writing this register in sync.  This technique is what you suggested as a solution to a question I had.  Here are the four records:

 

#---- $(DESC) ------------------------------

record( ao, "$(P):AO:SC:$(ITEM)"){

  field( DESC, "$(DESC):")

  field( OUT,  "$(P):AO:$(ITEM) PP")

  field( DRVL, "$(DRVL)")

  field( DRVH, "$(DRVH)")

}

record( ao, "$(P):AO:$(ITEM)"){

  field( SDIS, "$(P):AO:$(ITEM):Sync.PACT")

  field( DISV, "1")

  field( DTYP, "asynFloat64")

  field( OUT,  "@asyn($(PORT),0,1)AO_$(ITEM)")

}

record( ai, "$(P):AI:$(ITEM)"){

  field( DTYP, "asynFloat64")

  field( INP,  "@asyn($(PORT),0,1)AI_$(ITEM)")

  field( SCAN, "I/O Intr")

  field( EGU,  "$(EGU)")

  field( FLNK, "$(P):AO:$(ITEM):Sync")

}

record( ao, "$(P):AO:$(ITEM):Sync"){

  field( DOL,  "$(P):AI:$(ITEM) NPP")

  field( OMSL, "closed_loop")

  field( OUT,  "$(P):AO:SC:$(ITEM) PP")

}

 

An EDM Text Control widget connected to the "AO:SC" record is used to write a new value to the set point register.  Depending on some other configuration parameters that the power supply is set up with, write set point might fail.  When that happens, my writeFloat64 routine returns asynError and the SEVR gets set INVALID in the "$(P):AO:$(ITEM)" record.  I would like the EDM widget to reflect this alarm condition.  It does not do it because it is not connected to the AO record that is in an alarm state and I don't know how to transfer this alarm information to the record the EDM widget is connected to.

 

I wonder if it is possible to control alarm state of an EPICS record via asynPortDriver, a record that is not being processed at the moment?  That is, is there a way other than returning a failed completion code from a processing routine (like writeInt32) to put a record in an alarm state?

 

Thanks,

Zen



Replies:
RE: asynPortDriver Question Szalata, Zenon M.
Re: asynPortDriver Question Ralph Lange
References:
asynPortDriver Question Szalata, Zenon M.

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