Re: PV Access

["Kivel Niko \(PSI\) via Tech-talk" <tech-talk at aps.anl.gov>]

Hi Andrew

may I piggyback on this question? I got another documentation related question.

Some time ago I tried to use JSON input links, but failed w/ anything but pva.

DB example is below, based on this doc https://epics.anl.gov/base/R7-0/3-docs/links.html

record(ai, "${SYS}:constFloatPi") {

  field(INP,  3.14159265358979)

  field(PREC, 9)

  field(PINI, "NO")

  field(DESC, "ai, holding Pi, PINI=0")

}

# db input link

# not working: error --> dbJLinkInit: Link type 'db' not found

record(ai, "${SYS}:dbInput") {

  field(INP, {db:"${SYS}:constFloatPi"})

}

Can you please point out were the current documentation of the JSON link feature can be found? Or comment on the error "Link type 'db' not found" I receive?

best

Niko

--
Paul Scherrer Institute
Dr. Niko Kivel

Forschungsstrasse 111

WBGB/017
5232 Villigen PSI
Switzerland

phone: +41 56 310 2226
email: niko.kivel at psi.ch

---

From: Tech-talk <tech-talk-bounces at aps.anl.gov> on behalf of Johnson, Andrew N. via Tech-talk <tech-talk at aps.anl.gov>
Sent: Wednesday, March 25, 2020 21:49
To: Rolf Keitel
Cc: EPICS tech-talk
Subject: Re: PV Access

 

Hi Rolf,

There is a README.md in your base-7.x/modules/pva2pva directory which has one example, or look here. Look at the QSRV documentation at https://epics-base.github.io/pva2pva/qsrv_page.html#qsrv_group_def for details.

HTH,

- Andrew

On Mar 25, 2020, at 3:29 PM, Rolf Keitel via Tech-talk <tech-talk at aps.anl.gov> wrote:

I am looking for an introductory document which teaches me how to create an IOC database with structured data for PV Access.

Looks like I am too blind to find it.

 

Thanks – rolf -

 

Rolf Keitel, Ph.D

TRIUMF, 4004 Wesbrook Mall

Vancouver, BC, V6T 2A3

Tel.: 604 222 7453

e-mail: rolf at triumf.ca

 

-- The old generation has to die off so that a new set of idiots can make the same mistakes all over again --

-- 

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