Conversion error when using (pvapy served) PVA input link in a "bi" record

[Nicklas Holmberg via Tech-talk <tech-talk at aps.anl.gov>]

Hi,

 

I am using pva input links for two different records, a longin and a bi record. The “longin” record works without any problem, but the “bi” does not.

 

The error shown in the IOC shell is:

pvaLink long int {anonymous}::pvaGetValue(DBLINK*, short int, void*, long int*) fails my-bi:pvapy-bool: castUnsafeV: Conversion not supported

 

which, of course, repeats every time the record is processed.

 

The PVs are served from a python pvapy application, and I have no problem reading them using general EPICS commands like pvget, pvinfo, etc. I use them as input links to the bi and longin records like this:

 

record(longin, "my-longin:pvapy-int"){

field(INP,      {pva:{

                pv:"plc-ts:PLC:ts_1252_ns",

                proc:"CPP"

          }})

}

 

record(bi, "my-bi:pvapy-bool"){

field(INP,      {pva:{

                pv:"plc-ts:ptp:synchronized ",

                proc:"CPP"

           }})

}

 

The IOC uses EPICS 7.0.6.1 and the following st.cmd:

 

#!/usr/bin/env iocsh.bash

dbLoadRecords("nsrecord.db")

 

iocInit()

 

Doing “pvinfo” on the incoming PVs show:

 

$ pvinfo plc-ts:ptp:synchronized

plc-ts:ptp:synchronized

Server: 10.102.10.19:5075

Type:

    epics:nt/NTScalar:1.0

        boolean value

        string descriptor

        structure alarm

            int severity

            int status

            string message

        structure timeStamp

            long secondsPastEpoch

            int nanoseconds

            int userTag

        structure display

            double limitLow

            double limitHigh

            string description

            string format

            string units

        structure control

            double limitLow

            double limitHigh

            double minStep

 

$ pvinfo plc-ts:PLC:ts_1252_ns

plc-ts:PLC:ts_1252_ns

Server: 10.102.10.19:5075

Type:

    epics:nt/NTScalar:1.0

        string value

        string descriptor

        structure alarm

            int severity

            int status

            string message

        structure timeStamp

            long secondsPastEpoch

            int nanoseconds

            int userTag

        structure display

            double limitLow

            double limitHigh

            string description

            string format

            string units

        structure control

            double limitLow

            double limitHigh

            double minStep

 

 

 

______________________

 

Nicklas Holmberg

Senior Engineer, ICS HWI

 

European Spallation Source ERIC

P.O. Box 176, SE-221 00 Lund, Sweden

Visiting address: Partikelgatan 2, 224 84 Lund

Mobile: +46 76 168 06 60

E-mail: nicklas.holmberg at ess.eu

ess.eu