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| <== Date ==> | <== Thread ==> |
|---|
| Subject: | Parse Hex into signed number with streamdevice? |
| From: | "Blomley, Edmund \(IBPT\) via Tech-talk" <tech-talk at aps.anl.gov> |
| To: | "tech-talk at aps.anl.gov" <tech-talk at aps.anl.gov> |
| Date: | Mon, 15 Sep 2025 08:04:44 +0000 |
Hey, So my device sends me a 4 bit hex which I convert to a float using an ai record and linear conversion with ESLO. Let’s ignore the conversion for now, the number needs to be treated as a signed long, so I need to get the 2’s complement: 07D0 -> 2000 F6F5 -> -2315 Is there a way to do this directly with streamdevice? If not, I would need to read in the raw long and convert it myself. What is the best approach to do the conversion with records? So far I would do: field(CALC, "65535 - A + 1") with A being the raw long. Cheers |
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