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Subject: RE: To read single element from waveform record
From: "Mooney, Tim M." <mooney@aps.anl.gov>
To: ishita bhatia <ishita3006@gmail.com>, EPICS Tech-Talk <tech-talk@aps.anl.gov>
Date: Mon, 10 Aug 2015 14:45:08 +0000
I haven't done this with the subarray record.  With the acalcout record, I'd do it like this:

record(acalcout, "myacalc") {
    field(NELM, "4")
    field(NUSE, "4")
    field(INAA, "optoRead")
    field(CALC, "a:=aa[0,0];b:=aa[1,1];c:=aa[2,2];d:=aa[3,3];1")
    field(FLNK, "opto1Binary")
}
record(bo, "opto1Binary")
    field(DOL, "myacalc.A")
    field(OMSL, "closed_loop")
    field(FLNK, "opto2Binary")
}
record(bo, "opto2Binary")
    field(DOL, "myacalc.B")
    field(OMSL, "closed_loop")
    field(FLNK, "opto3Binary")
}
...

Tim Mooney (mooney@aps.anl.gov) (630)252-5417
Beamline Controls Group (www.aps.anl.gov)
Advanced Photon Source, Argonne National Lab


From: tech-talk-bounces@aps.anl.gov [tech-talk-bounces@aps.anl.gov] on behalf of ishita bhatia [ishita3006@gmail.com]
Sent: Monday, August 10, 2015 5:12 AM
To: EPICS Tech-Talk
Subject: To read single element from waveform record

Hello,
I have a waveform record with 4 elements with  ftvl=USHORT. How to read a single element from waveform using subArray or acalcout record or any other record.  I have tried using subarray as

record(waveform, optoRead) {
  field(SCAN, "Passive")
  field(NELM, "4")
  field(FTVL, "USHORT")
  field(DTYP, "wafoptosupport")
  field(FLNK, "optolinks")
}

record(subArray, opto1) {
  field(SCAN, "Passive")
  field(DTYP, "Soft Channel")
  field(FTVL, "USHORT")
  field(INP, "optoRead")
  field(INDX, "0")
  field(FLNK, "opto1Binary")
  field(MALM, "2")
  field(NELM, "1")
}

record(subArray, opto2) {
  field(SCAN, "Passive")
  field(DTYP, "Soft Channel")
  field(INP, "optoRead")
  field(MALM, "4")
  field(INDX, "1")
  field(FLNK, "opto2Binary")
  field(FTVL, "USHORT")
  field(NELM, "1")
}

record(subArray, opto3) {
  field(SCAN, "Passive")
  field(DTYP, "Soft Channel")
  field(INP, "optoRead")
  field(MALM, "4")
  field(INDX, "2")
  field(FLNK, "opto2Binary")
  field(FTVL, "USHORT")
  field(NELM, "1")
}

record(subArray, opto4) {
  field(SCAN, "Passive")
  field(DTYP, "Soft Channel")
  field(INP, "optoRead")
  field(MALM, "4")
  field(INDX, "3")
  field(FLNK, "opto2Binary")
  field(FTVL, "USHORT")
  field(NELM, "1")
}


but it doesn't works. Everytime on doing caget it prints just the first element of waveform.

References:
To read single element from waveform record ishita bhatia

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