Epson DFX-8500 User Manual - Page 220

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 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 30-39) 0-9 (Hex 30-39) 0-9 (Hex 30-39), (Hex 41-5A), (Hex 20, 24, 25, 2B, 2D, 2E, 2F) Set A, Set B, Set C The following conditions are required for barcode printing: T Barcode printing is always performed unidirectionally. However, when it is mixed with raster bit image data, neither barcode nor raster bit image data is printed. T A barcode is not printed when part of the barcode extends beyond the right margin. B T When barcode data and text data are mixed in a data sequence, barcode and text are printed in the same place. T The start and stop (*) characters of Code 39 are added to human readable characters. T The initial data of Code 128 (Set A, B, or C) is identified as the first data of Code 128, and must be hexadecimal (41, 42, and 43 respectively). T 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. T The barcode print start position (except POSTNET) is always 7/72 inch above the baseline. Printer Commands and Character Tables B-5