Re: FLNK doesn't process

[William Kirstaedter via Tech-talk <tech-talk at aps.anl.gov>]

Hi,

Im hijacking this Thread because I have a similar problem but the suggested solution is not working.

we have the following db:

record(stringin, "$(P):$(R):getter"){
        field(DESC, "$(DESC) raw answer")
        field(DTYP, "stream")
        field(INP, "@maxigauge.proto getSensorValue($(CHA)) $(PORT)")
        field(SCAN, "1 second")
        field(FLNK, "$(P):$(R):Status.PROC CA")
}

record(scalcout, "$(P):$(R):Status"){
        field(DESC, "$(DESC)")
        field(INAA, "$(P):$(R):getter")
        field(CALC, "SSCANF(AA, \"%d%*\")")
        field(FLNK, "$(P):$(R):Pressure.PROC CA")
}

record(scalcout, "$(P):$(R):Pressure"){
        field(DESC, "$(DESC)")
        field(INAA, "$(P):$(R):getter")
        field(CALC, "SSCANF(AA, \"%*2c%E\")")
        field(PREC, "15")
        field(EGU, "mbar")
        field(ADEL, $(ADEL))
        field(MDEL, $(MDEL))
}

this ran fine until recently.
we dont know whats wrong now...
(original code was without ".PROC CA" and with PREC "12")

the problem is that the :getter PV continiously provides new values, while the :Status and :Pressure PVs slow down and stop updating when the Vacuum reaches Pressures in the Range <=1.0E-9.

>= 1.0E-7 its updating fast, around 8.0E-8 its only every minute or so and below it basically stops.

can anybody tell me why this is happening?

I first thought it was the unsufficient PREC but appearantly it isnt. :(

Thanks in Advance,

William

William Kirstaedter (PP&B)	Fritz-Haber-Institut der MPG
Faradayweg 4-6	14195 Berlin
Tel: 030 8413 5405	Mail: kirstaedter at fhi-berlin.mpg.de

Am 15.01.2022 um 02:25 schrieb Randall Cayford via Tech-talk:

That worked.  Thanks!

On Jan 14, 2022, at 12:44 PM, Hu, Yong <yhu at bnl.gov> wrote:

Change this line: 

field (FLNK, "$(P):current1.PROC")
to:

field (FLNK, "$(P):current1.PROC CA")

From: Tech-talk <tech-talk-bounces at aps.anl.gov> on behalf of Randall Cayford via Tech-talk <tech-talk at aps.anl.gov>
Date: Friday, January 14, 2022 at 3:18 PM
To: Gofron, Kazimierz via Tech-talk <tech-talk at aps.anl.gov>
Subject: FLNK doesn't process

I have a periodic scanned PV which I occasionally set.  However, when I set it, I can’t read the updated value until the periodic scan happens.  I would like the PV value to update as soon as it’s set.  I thought that was what was supposed to happen with FLNK but it doesn’t seem to.

My db has:
record (ai, "$(P):current1")
{
    field (DTYP, "stream")
    field (INP, "@thorlab.proto getcurrentch(1) $(BUS)")
    field (SCAN, "10 second")  
}

record (ao, "$(P):setcurrent1")
{
    field (DTYP, "stream")
    field (OUT, "@thorlab.proto setcurrentch(1) $(BUS)")
    field (FLNK, "$(P):current1.PROC")
    field (SCAN, "Passive")
}

"caput setcurrent1 10" works but it takes whatever is left of the 10 second scan period before current1 changes.
“caput current1.PROC 1” immediately updates the value in current1.

I tried     field (FLNK, "$(P):current1”) but that doesn’t process either.

What’s the trick for getting a periodic scan PV to process within a forward link?  Or is there some other way I’m supposed to do this?

Thanks.

Randall
LBNL