The actual construction of the bar code for a given character is described on various web sites (some of which are referenced at the end of this appendix.The sequences %X, %Y, and %Z represent the ASCII DEL character (as does %T).The digits (0 through 9) can also be encoded as /P through /Y.can also be encoded as /M and /N respectively The character * must be encoded as /J when used as a regular character because * is used as the start/stop characters (which must appear at the beginning and end of all bar codes).The four characters $ % + / represent themselves if immediately followed by a digit, a space, $ % + /, or a stop character (otherwise these four characters must be encoded as shown in the above table).The table below shows the complete ASCII character set as it is represented in an Extended Code 39 bar code. It is not possible to encode the characters between hex 80 and hex FF. This Extended Code 39 format allows us to encode the full 128 character ASCII character set by defining specific 2-character Code 39 sequences to encode the remaining ASCII characters. The standard Code 39 character set only supports 43 characters (26 uppercase letters, 10 digits, and 7 special characters (. The printing and scanning of bar codes will be supported for the Transaction ID. The OCLC Distributed ILL project will support the printing and scanning of Extended Code 39 bar codes.
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