Epson LQ-2070 User Manual page 152

The valid data of each barcode type is described below. If invalid data
is included in the barcode data string, the barcode is not printed.
Barcode Type
EAN13
EAN-8
UPC-A
UPC-E
Interleaved 2 of 5
POSTNET
Code 39
Code 128
The following conditions are required for barcode printing.
Barcode printing is always performed unidirectionally. However,
when it is mixed with raster bit image data, neither barcode nor
raster bit image is printed.
A barcode is not printed when part of the barcode extends beyond
the right margin.
When barcode data and text data are mixed in a data sequence,
barcode and text are printed in the same place.
The initial data of Code 128 (Set A, B, or C) is identified as the
firstdata of Code 128, and must be hexadecimal (41,42, and 43
respectively).
When Code 128 Set C and Interleaved 2 of 5 are selected, barcode
data requires an even number data string. However, if an odd
number string is sent, a 0 is automatically added, making it an
even number data string.
The barcode print start position is always 40/360 inch above the
baseline.
Specifications, Command Summary, and Character Tables
Barcode Data
0-9 (Hex 30-39)
0-9 (Hex 30-39)
0-9 (Hex 30-39)
0-9 (Hex 30-39)
0-9 (Hex 3039)
0-9 (Hex 3039)
0-9 (Hex 3039). (Hex41-5A), (Hex 20.24,25,
2B,2D,2E,2F)
Set A, Set B, Set C
A-31