Comment by lazulicurio

Do you have the scanner set up as a keyboard wedge (USB-HID)? From your description, it sounds like it. Usually when dealing with control characters it's easier to put scanners in virtual COM mode. Although using them as a COM device does carry its own set of issues. I'm more familiar with honeywell and cognex scanners, but quickly browsing the realinn documentation I don't see a character replacement functionality.