Datamax A-4310 Programmer's Manual page 204

p: Postnet
Valid Characters: 0-9
Length: 5, 9 or 11 digits
Valid bar widths: The width and height multiplier values of 00 will produce a valid Postnet symbol.
Usage: The bar code height field is ignored since the symbol height is United States Postal Service
specific. This bar code is to display the zip code on a letter or package for the US Postal Service.
The following example prints a Postnet bar code:
<STX>L
D11<CR>
1p000000015010032569<CR>
121100000000100Barcode p<CR>
E
Q: UCC/EAN Code 128
Valid Characters: 0-9
Length: 19 digits.
Valid bar widths: The fourth character of record is the width of the narrow bar in dots. All other bars
are a ratio of the narrow bar (2 times, 3 times, and 4 times the narrow bar width). Human readable
characters for this bar code symbology are printed above the symbol.
The printer spreads a weighted module 103 check sum.
The following example prints a UCC/EAN Code 128 bar code:
<STX>L
D11<CR>
1Q00000001501000123456789012345678<CR>
121100000000100Barcode Q<CR>
E
188
Appendix G – Barcode Details
Class Series Programmer's Manual