Experimental Physics and
Industrial Control System

Mark Rivers via Tech-talk <tech-talk at aps.anl.gov> · Thu, 6 Feb 2020 17:14:35 +0000

Forgot to CC tech-talk.

Sent from my iPhone

Begin forwarded message:

From: Mark Rivers <rivers at cars.uchicago.edu<mailto:rivers at cars.uchicago.edu>>
Date: February 6, 2020 at 11:11:17 AM CST
To: Tomasz Brys <Tomasz.Brys at ess.eu<mailto:Tomasz.Brys at ess.eu>>
Subject: Re: send/receive waveform over network.

Hi Tomasz,

There is no limitation that prevents Stream Device from sending a large waveform. In fact I have done so with the Tabor waveform generator in the synApps "ip" module.

https://github.com/epics-modules/ip/blob/master/ipApp/Db/Tabor8024.proto

Mark

Sent from my iPhone

On Feb 6, 2020, at 11:02 AM, Tomasz Brys via Tech-talk <tech-talk at aps.anl.gov<mailto:tech-talk at aps.anl.gov>> wrote:

Hi
I have a beginner question. I want to send via ethernet (TCP/UDP) a waveform from IOC to external device. The waveform consists of binary data and can be big so the Stream Device is not a solution. To simplify the problem, I tested it with longout and a local server listening on port 7777.
In my startup command I have:

drvAsynIPPortConfigure("det-stream", "localhost:7777")

Then I load my db, which is very simple:

record(longout, "p") {
   field(VAL, "1")
   field(DTYP, "asynInt32")
   field(OUT,  "@asyn(det-stream)")
}

I started IOC, no errors. But how I can send the VAL over TCP?
"dbpf p 2" does not work, neither "dbpf p.PROC"
Do I have to write my own implementation of asynDriver?
Is it any differences between sending longout and waveform?

Regards
Tomasz

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System