Epson 24-Pin User Manual page 210

Barcode commands
Your printer has powerful barcode printing capabilities and
includes the following resident barcode fonts: EAN-13, EAN-8,
Interleaved 2 of 5, UPC-A, UPC-E, Code 39, Code 128, and
POSTNET. See the barcode commands below:
ESC ( B
Format:
ASCII code:
Decimal:
Hexadecimal:
Function:
ESC ( B n1 n2 k m s v1 v2 c data
n = (n1 + (256
k: Select barcode
k = 0: EAN-13, 1: EAN-8, 2: Interleaved 2 of 5, 3: UPC-A,
4: UPC-E, 5: Code 39, 6: Code 128, 7: POSTNET
m: Module width (180 dpi)
m = 2: 2 dots, 3: 3 dots, 4: 4 dots, 5: 5 dots
s: Space adjustment value
-3 s 3 (1/360-inch units)
v1, v2: Bar length
v1 + v2
Note:
The v1 and v2 values are ignored when POSTNET is selected.
The long bar length of POSTNET is always 0.125 inch; the
short bar length is always 0.050 inch.
C-16
Specifications
ESC (
27 40
1B 28
n2))
256 (1/180-inch units)
Select Barcode Printing
B m
66 m
42 m
n
n
n