Test barcode to check if digits and letters are at the right position (for AZERTY vs other keyboards).
If not, select the right keyboard and test again:
Add prefix ALT+K for the goods shop:
The complete manual of the reader can be found here:
https://country.honeywellaidc.com/CatalogDocuments/VG1400-UG%20Rev%20C.pdf
Or inline in this page.