Symbologies 12 - 57
Transmit Symbols in Codeword Format
Enabling this activates transmission o f each PDF symbol as directly decoded dat a codewords, whether that symbol
is part of a macro PDF sequence or not. Note that data is output as codeword values — not as interpreted data.
“Codeword values” is an ASCII representation of a number from 000 to 928 for each codeword, preceded by an
escape character. This escape character is a backslash. For example, the codeword value 005 is sent to the host
in the form o f \005 fo r GLIs, and \C005C for ECIs. This output format is based on the AIM USA Uniform Symbology
Specification for PDF-417 (1994).
All output codewords take up exactly 4 characters for GLIs and 6 characters for ECIs. However, there may be
nondecodable character s in the PDF symbo l, su ch as a GLI sequence. This special c ode wo rd sequ en ce activa tes
a certain kind of interpretation to the encoded da ta. Non-decodab le co de wo rd s like GL Is ar e em b ed ded in the
output stream just like any other codeword, e.g., \927\001.
Because GLIs are indistinguishable from other codewords in the output data stream, the host must intelligently
recognize them as GLIs and process their interpretations.
Note that when a macro PDF sequence is transmitted, the last character in the last block of data transmitted is
always \922 (if selected). This indicates the end of that macro PDF transmission.
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