Motorola LS4208 用户手册

Symbologies 12 - 57

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.