RE: Native NI LabVIEW/EPICS integration

[Mark Rivers <rivers@cars.uchicago.edu>]

Hi Luca,

Here is a database idiom that can be used for that:

For write you write to the FileNumber PV.  It does the actual I/O through FileNumber_write.

When LabView updates the value FileNumber_RBV is changed.  That will update FileNumber without processing FileNumber_write again.

************************************************
record(longout, "$(P)$(R)FileNumber")
{
    field(PINI, "YES")
    field(OUT, "$(P)$(R)FileNumber_write PP")
    field(VAL, "1")
}

record(longout, "$(P)$(R)FileNumber_write")
{
    field(SDIS, "$(P)$(R)FileNumber_Sync.PACT")
    field(DISV, "1")
    field(DTYP, "asynInt32")
    field(OUT, "@asyn($(PORT),$(ADDR),$(TIMEOUT))FILE_NUMBER")
}

record(longin, "$(P)$(R)FileNumber_RBV")
{
    field(DTYP, "asynInt32")
    field(INP,  "@asyn($(PORT),$(ADDR),$(TIMEOUT))FILE_NUMBER")
    field(SCAN, "I/O Intr")
    field(FLNK, "$(P)$(R)FileNumber_Sync")
}

record(longout, "$(P)$(R)FileNumber_Sync")
{
    field(DOL,  "$(P)$(R)FileNumber_RBV NPP")
    field(OMSL, "closed_loop")
    field(OUT,  "$(P)$(R)FileNumber PP")
}
************************************************

Mark



________________________________________
From: tech-talk-bounces@aps.anl.gov [tech-talk-bounces@aps.anl.gov] on behalf of Luca Cavalli [LCavalli@cgspace.it]
Sent: Thursday, November 10, 2016 8:38 AM
To: tech-talk@aps.anl.gov
Subject: Native NI LabVIEW/EPICS integration

Dear all,

I have to control a NI PXI device.
The software is written in LabVIEW using native NI LabVIEW/EPICS
interface,unfortunately it seems to only support a subset of PV properties (no
EGU, limits etc.).

My idea is to write a tiny IOC that maps the "raw" LabView variable (e.g.
PV_NAME_RAW) to a complete EPICS PV (e.g. PV_NAME) with precision, EGU, alarms
and limits.

[My IOC] <--PV_NAME--> [LV Mapper IOC] <--PV_NAME_RAW--> [NI PXI]

The problem is that my PV must be both readable and writable at the same time.
I.e. when I write the PV_NAME variable I want also the PV_NAME_RAW variable to
be updated, and when LabVIEW modifies PV_NAME_RAW value I want PV_NAME to
reflect the change.
How can I define my db in LV Mapper IOC? I'm a bit lost, shall I use an input
record or output record?

So far I only achieved single direction control (either input or output, not
both at the same time).

Thanks for your help.

Luca


________________________________

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