In this case you can usually configure the device to provide specific "key sequences" before and after scanning, as well as provide a mapping from the Latin-1 ordinals (0-255) represented in a barcode to the physical scan codes read by the keyboard interface, For example, in a particular application one might choose to map Carriage Return (ASCII 13) to the Down Arrow (5000) scan code. Each method will provide different ways to configure how control codes are presented to your application.Ī hardware reader might be configured in "keyboard wedge" mode where the device emulates a physical keyboard by generating keyboard scan codes. Scanning any type of barcode containing ASCII control characters may not give the intended result due to the diverse ways that the barcode contents may be provided to the system. General effect of scanning barcodes containing ASCII control characters The internal encoding uses code set A and contains these code words: Here is a Code 128 barcode representing a lone HT character (ASCII value 9): Generating a Code 128 containing an ASCII control characterĬode 128 can be used to encode any character in the Latin-1 character set, including ASCII control characters (ordinals 0 to 31).
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