What text encoding is writer using?

[hovek]

I don't know where else to ask this question and I can't find an answer to this. I can't ask a question on StackOverflow either.
Language is Croatia.
I am calling this;
var bytes = Encoding.UTF8.GetBytes(text); IronBarCode.BarcodeWriter.CreateBarcode(bytes, IronBarCode.BarcodeEncoding.PDF417); qRCodeData.SaveAsPng(path);
qRCodeData.TextEncoding is UTF8.

When I scan the barcode I am getting a scrambled text.
When instead of bytes I give him text it works, why is it not working when I give him bytes?
Why is the original text not transferred to a barcode when I used UTF8? What encoding is BarcodeWriter using?