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<== Date ==> <== Thread ==>
Subject: Re: ASLO doesn't work
From: "Hu, Yong via Tech-talk" <tech-talk at aps.anl.gov>
To: Vishnu Patel <patel.vishnu at hotmail.com>, EPICS Tech Talk <tech-talk at aps.anl.gov>, Ralph Lange <ralph.lange at gmx.de>
Date: Thu, 17 Sep 2020 12:00:45 +0000

Hi Vishnu,

 

I think you misunderstood the conversion in ai record (or I misunderstand it). EGUF & EGUL are Full & Low values in engineering unit. I do not think a vacuum value can go negative “-32768”. “-32768” seems to be a ADC raw value.

 

As Ralph said, the conversion probably has already been done in the driver. If your goal is just the conversion from mBar to Bar, then use a “calc” or “calcout” to do the conversion.  

 

See the links below:

https://wiki-ext.aps.anl.gov/epics/index.php/RRM_3-14_Analog_Input

https://wiki-ext.aps.anl.gov/epics/index.php/RRM_3-14_Concepts#Conversion_Specification

https://wiki-ext.aps.anl.gov/epics/index.php/RRM_3-14

 

Good luck!

Yong

 

 

From: Tech-talk <tech-talk-bounces at aps.anl.gov> on behalf of "tech-talk at aps.anl.gov" <tech-talk at aps.anl.gov>
Reply-To: Vishnu Patel <patel.vishnu at hotmail.com>
Date: Thursday, September 17, 2020 at 7:14 AM
To: "tech-talk at aps.anl.gov" <tech-talk at aps.anl.gov>, Ralph Lange <ralph.lange at gmx.de>
Subject: Re: ASLO doesn't work

 

Thanks,

   I tried with EGUF = 32.767 , EGUL = -32.768 but the VAL was not factor of 1000. I tried with ESLO also but not result.  

I am missing something.

 

Thanks

Vishnu

 

Sent from Outlook

From: Tech-talk <tech-talk-bounces at aps.anl.gov> on behalf of Ralph Lange via Tech-talk <tech-talk at aps.anl.gov>
Sent: 17 September 2020 16:35
To: EPICS Tech Talk <tech-talk at aps.anl.gov>
Subject: Re: ASLO doesn't work

 

On Thu, 17 Sep 2020 at 11:10, Vishnu Patel via Tech-talk <tech-talk at aps.anl.gov> wrote:

record(ai, "AI0") {

    field(LINR,"LINEAR")

    field(EGUF,"32767")

    field(EGUL,"-32768")

}

 

The PLC the value is 1003.124 in mBar, i have to display as 1.0031 Bar.

 

As you are using linear conversion already,

wouldn't setting EGUF to 32.767 and EGUL to -32.768 result in a VAL that is smaller by a factor of 1000?

 

Cheers,
~Ralph

References:
ASLO doesn't work Vishnu Patel via Tech-talk
Re: ASLO doesn't work Ralph Lange via Tech-talk
Re: ASLO doesn't work Vishnu Patel via Tech-talk
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