Re: Parse Hex into signed number with streamdevice?

["Zimoch, Dirk via Tech-talk" <tech-talk at aps.anl.gov>]

Hello Eddy

Signed %x input is currently not supported by StreamDevice but it is definitely
useful to have. I have to think how to implement it and which flag to use to
signal the switch from normal unsigned %x.

Dirk

On Mon, 2025-09-15 at 08:04 +0000, Blomley, Edmund (IBPT) via Tech-talk wrote:
> 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
> eddy
>