Re: writing a value of a string PV to a waveform PV in another IOC

["Gregory, Ray via Tech-talk" <tech-talk@aps.anl.gov>]

Thank you, Andrew. Works great!

Ray

Ray Gregory

DAS Software Group

NTD Division

NScD Directorate

Oak Ridge National Laboratory 

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From: Johnson, Andrew N. <anj@anl.gov>
Sent: Tuesday, October 28, 2025 6:28 PM
To: Gregory, Ray <gregoryrd@ornl.gov>; tech-talk@aps.anl.gov <tech-talk@aps.anl.gov>
Subject: [EXTERNAL] Re: writing a value of a string PV to a waveform PV in another IOC

 

record(stringout, "source") { field(VAL, "String to copy") } record(aao, "str-copy") { field(FTVL, "CHAR") field(NELM, 100) field(DOL, "source. $") field(OMSL, "closed_loop") field(OUT,

record(stringout, "source") {

    field(VAL, "String to copy")

}

record(aao, "str-copy") {

    field(FTVL, "CHAR")

    field(NELM, 100)

    field(DOL, "source.$")

    field(OMSL, "closed_loop")

    field(OUT, "dest")

}

record(waveform, "dest") {

    field(FTVL, "CHAR")

    field(NELM, 100)

}

This uses an aao record to grab the source value as an array of chars, and then copy that array to the waveform. Process the str-copy record to perform the copy. Note that the DOL and OMSL fields were only added to the aao record type in EPICS version 7.0.7.

- Andrew

-- 

Complexity comes for free, Simplicity you have to work for.

On 10/28/25, 5:07 PM, "Tech-talk" <tech-talk-bounces@aps.anl.gov> wrote:

Hi,

What is the best way (without having to write anything more than EPICS database code) to copy the value of a string PV (stringout) hosted in one IOC to a waveform PV (char type) hosted by another PC?

I'm having problems trying to set the output link to a waveform PV name.

Thank you,

Ray

Ray Gregory

DAS Software Group

NTD Division

NScD Directorate

Oak Ridge National Laboratory