Parse Hex into signed number with streamdevice?

["Blomley, Edmund \(IBPT\) via Tech-talk" <tech-talk at aps.anl.gov>]

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

 

Attachment: smime.p7s
Description: S/MIME cryptographic signature