Datamax A-4310 Programmer's Manual page 226

Control Codes: Control character encoding into Code 128 Subset A by sending these control codes:
The following example prints a Code128 Auto bar code:
<STX>L
D11<CR>
1W1J000000025002512345&G10Z2133021AK<CR>
121100000000100Barcode W1J<CR>
E
When scanned this bar code will decode as:
[C]1234[B]5[F1]10Z2 [C]133021[B]AK(95)
210
Appendix G – Barcode Details
` = NUL
a through z = 1 - 26
{ = ESC
| = FS
} = GS
~ = RS
ASCII 127 = US
Barcode W1J
Class Series Programmer's Manual