Transmit Symbols In Codeword Format - Symbol Cyclone M2000 Series Product Reference Manual

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Transmit Symbols in Codeword Format

Enabling this activates transmission of each PDF symbol as directly decoded data
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 of \005 for 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 characters in the PDF symbol, such as a GLI
sequence. This special codeword sequence activates a certain kind of interpretation to the
encoded data. Non-decodable codewords like GLIs are embedded 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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