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| <== Date ==> | <== Thread ==> |
|---|
| Subject: | Re: aiRecord conversion |
| From: | Ralph Lange <[email protected]> |
| To: | EPICS Tech Talk <[email protected]> |
| Date: | Tue, 28 Aug 2012 16:05:46 +0200 |
|
On Tue Aug 28 2012 15:28:34 GMT+0200
(CEST), Bruno Seiva Martins <[email protected]> wrote:
Rectifying: Another comment: The linear conversion mechanism is intended to convert the digitized value into the final engineering units. You might want to use your A/D converter for signals that correspond to positions [mm], pressures [mbar], or temperatures [C]. In those cases, the database designer will set EGU, EGUL and EGUF to e.g. "mm", -5 and 25, meaning that -10V are equivalent to -5mm, and +10V are equivalent to +25mm. To limit the range that is shown in the GUI, the designer might also want to set e.g. LOPR to -2 and HOPR to +2, so that graphs and meters show the "interesting" range, -2mm to +2mm. To have this work correctly, setting EGUF, EGUL, HOPR and LOPR in your device support may actually not be a good idea. Normally, I would just set ESLO and EOFF. Cheers, ~Ralph |