Epson TM-C3400 Technical Reference Manual page 178

AztecCode
❏ Supports the full range mode and the compact mode.
DataMatrix
❏ Supports the square of the ECC200 version.
Printing method
Specify the selected 2D symbol font, specified point and language to the printing data, and print
it.
The font size of the 2D symbol can not be changed by [Specified Point] value.
The 2D symbol is not printed when other values are selected.
Printing the 2D symbol in cyan only
When the printed 2D symbol is difficult to read, make settings to print it in cyan only.
For details, see "Printing the barcode in cyan only" on page
178
171.