convert unsigned to signed bytes

[mattk242]

Hi,

My oscilloscope sends a 2500 signed bytes in a string, and i want to plot these points. labview has a string to unsigned array converter, but i want to convert it to an array of signed integers.

is there an easy way to convert an unsigned array into a signed array (with 2500 elements)?

[Dennis_Knutson]

You should be able to use the typecast function with a signed array as the type input.

[mattk242]

Hmmm... I can't figure out that type-casting thing. But just in case anyone else runs into this same problem (I can't be the first guy to take data from an oscilloscope), here's how I converted my unsigned bytes into signed (and scaled) floating poing voltages.

The conversion takes place in a for loop.
The scaling takes place in a formula node.

(this program may not be optimized for speed).

[Dennis_Knutson]

If you had looked at one of the scope drivers available at the Instrument Driver Network<>, you will indeed see that is has been done before (and with a typecast)....