Experimental Physics and
Industrial Control System

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Hi Greg,

I'm not a StreamDevice expert at all, but it seems to me that your design is expecting the number 9.9e37 to fit into a longin record's VAL field. In EPICS the word "long" was set in the days when an int was only 16 bits wide, so a DBF_LONG is only an epicsInt32 with a maximum value of 2,147,483,648 ~ 2.15e9.

Changing the record into an ai should fix that.

- Andrew

Hi again,

Still trying to run down some more details about talking to these lovely Keysight boxes via EPICS.  I've got the stock SCPI stuff working, so next I wanted to read some resistance values.  I added this to my protocol file: 

getResistance {

    out "measure:resistance? \$1,\$2,\$3";

    in "%E";

}

And added this to my .db file:

record(longin, "$(P)$(R)GetIG")

{

    field(DESC, "Get Alphatross Ion Gauge Value")

    field(DTYP, "stream")

    field(INP,  "@devswag6.proto getResistance(10,0.1,(@5012)) $(PORT) $(A)")

}

After starting the ioc, I can do ' dbtr swag6testGetIG`, which sends the correct string, and gets a reply from the mainframe.  What I'm stuck on is handing the reply.  The box replies with:

 +9.90000000E+37\n

But the way I have things configured I get:

2023/01/24 12:49:07.000698 LAN0 swag6testGetIG: Format "%E" has data type double which is not supported by "swag6testGetIG".

It seems like that should work, based on: https://paulscherrerinstitute.github.io/StreamDevice/formats.html  

I don't know if I managed to compile StreamDevice with some missing library, or if I've done something else wrong along the way.  

Thanks for any pointers,

     Greg

--

Gregory Leblanc

Accelerator Engineer

Edwards Accelerator Lab - Ohio University

123 University Terrace

Athens, OH 45701 USA

leblanc at ohio.edu

M: (401) 52-OUAL1 or (401) 526-8251

-- 

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