Experimental Physics and
Industrial Control System

"Leblanc, Gregory via Tech-talk" <tech-talk at aps.anl.gov> · Mon, 26 Jun 2023 18:20:15 +0000

Hi folks,

I'm still working on getting these Heinzinger PCU 50-300 supplies doing everything I want using EPICS.  Today I thought I'd try reading the status word from the supply, so I added an mbbiDirect record.  The custom sections of my .db file now read:

record(ai, "$(P)$(R)GetCurrent") {
    field(DESC, "Read output current")
    field(DTYP, "stream")
    field(INP, "@devPCU50_300.proto getCurrent $(PORT) $(A)")
    # field(SCAN, "1 second")
    field(SCAN, "Passive")
    # field(PINI, "YES")
    field(EGU, "Amps")
    field(ESLO, "0.001")
    field(LINR, "SLOPE")
}

record(ao, "$(P)$(R)SetCurrent") {
    field(DESC, "Write output current")
    field(DTYP, "stream")
    # field(SCAN, "1 second")
    field(SCAN, "Passive")
    field(OUT, "@devPCU50_300.proto setCurrent(%d) $(PORT) $(A)")
    field(PINI, "YES")
    field(VAL, "0")
    # field(FLNK, "$(P)$(R)GetCurrent")
    field(EGU, "Amps")
    field(ESLO, "0.001")
    field(LINR, "SLOPE")
}

record(mbbiDirect, "$(P)$(R)StatusRegister") {
    field(DESC, "Status Register")
    field(NOBT, "24")
    field(DTYP, "stream")
    field(INP,  "@devPCU50_300.proto getStatus $(PORT) $(A)")
    field(PINI, "YES")
    field(SCAN, "Passive")
}

But I'm seeing some unexpected behavior, somehow related to my other records.  Above, the PINI field for the GetCurrent record is commented out.  When I start the IOC in this state, the StatusRegister record is properly populated.  If I set PINI to YES and start the IOC, the StatusRegister record is not properly populated.  Running the command 'dbtr PCU50_300testStatusRegister' on the "broken" startup will update it so that it has the correct status.  I've watched the console output when launching st.cmd, and browsed the logfiles that I generated, but I can't spot what I'm doing wrong.  I've attached a logfile where I have the problem, and another where I don't.  I've also attached the .db file, the .proto file, and my st.cmd, all in a .7z file.

I feel like the root cause is that somehow the replies to the different serial commands are getting mixed up, but I can't see how that's possible.  It is more likely that I've done something silly along the way.  Any hints for troubleshooting are greatly appreciated!
     Greg

--
Gregory Leblanc
Accelerator Engineer
Edwards Accelerator Lab - Ohio University
123 University Terrace
Athens, OH 45701 USA
leblanc at ohio.edu
M: (401) 52-OUAL1 or (401) 526-8251

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System