Re: PVA custom structs

["Zelazny, Michael Stanley via Tech-talk" <tech-talk at aps.anl.gov>]

You can make a standard NTTable with 4 columns (Width Delay ExtraDly Atten) and 2 rows for Ch1 and Ch2. Or 8 columns with 1 row if you prefer.

I can confirm that the archive appliance knows how to archive an NTTable.

-Mike

---

From: Tech-talk on behalf of Heinz Junkes (FHI) via Tech-talk
Sent: Friday, May 08, 2026 08:10
To: EPICS Tech-Talk
Cc: Wieland Schöllkopf
Subject: PVA custom structs

Hi,
I am running a P4P server on an embedded system and offer the following structure:

epics@felpvagate:~$ pvinfo  FHIFEL:llpg_1
FHIFEL:llpg_1
Server: 10.0.0.87:5075
Type:
    structure
        ushort Ch1_Width
        ushort Ch2_Width
        ushort Ch1_Delay
        ushort Ch2_Delay
        ushort Ch1_ExtraDly
        ushort Ch2_ExtraDly
        ushort Ch1_Atten
        ushort Ch2_Atten

Unfortunately, the archiverAppliance cannot monitor/archive these.

Was ist der beste Weg um diese Werte zu archivieren?

1.) Should the 8 values be made available as ‘individual’ scalar PVs on the embedded system as well?

2.) Run a ‘converter’ on another system that maps the custom struct to scalar PVs?

3.) Another idea ?

Danke Heinz
------------------------------------------------------------------------------
Fritz-Haber-Institut  | Phone: (+49 30) 8413-4270
Heinz Junkes          | VC: https://zoom.fhi.berlin/junkes
Faradayweg 4-6        | Visitors: Hittorfstrasse 29 (Bld S (Slough House) )
D - 14195 Berlin 
------------------------------------------------------------------------------
“Sorry I’m a bit late, had a terrible time…
All sort of things cropping up at the last moment. Uh, how are we for time?”
—Zarquon's address to Milliways