Datamax E-Class Mark II Programmer's Manual page 259

Appendix G – Bar Code Details
From the example, the bar code's data stream,
1W1Z0000000150100001214000PDF<0x0D>417,
includes a Byte Count Specifier (the portion in bold), where 0012 equals the four-digit
decimal data byte count and includes all bytes that follow until the end of the bar code
data. Field termination is set by the byte count. <STX>, <CR>, and <0x0D> all represent
single byte values of hexadecimal 02, 0D, and 0D, respectively. The Micro PDF417 bar
code produced encodes "pdf<CR>417", and prints a line of text: Barcode W1Z.
Class Series 2 Programmer's Manual 247