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You should get the value "123456-qwertz" in notepad. If not, choose one of the below layouts and test again:
When you scan the first barcode (123456-qwertz) in notepad, you should have a carriage return (enter) at the end (so it skips to the next line in notepad. If not, scan this:
If it doesn't work, reset the reader to the factory settings (maybe there are some strange configuration active) by scanning the two barcodes below, and restart from the top of this page.
Then scan this one to add the prefix "ALT+k":
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