How to add extra and special characters in Code 39?

ERROR MESSAGE: Provided value can't be encoded by current symbology. Code 39 symbology allows at most first 128 ASCII symbols to be encoded.

When you get the error message above, please use the Full ASCII 39 here.

This is the supported method for extra characters. The resulting barcode generated using such characters becomes the "Code 39 Extended" type, and by default is supported by your barcode reader.