This article shows you the ESC/POS commands for the printing of barcodes on standard Epson receipt printer such as the Epson TM-T88III.

The ESC/POS commands are a set of proprietary POS printer command system developed by EPSON.

If you have a different printer, please refer to the corresponding codes in your printer manual. But Epson is pretty much the industry standard for receipt printer and most receipt printers support these ESC/POS commands. You can just try the commands below. Most likely it will work on your receipt printer.

GS f

Note: GS below refers to hexadecimal number "1D".

Description:	Select barcode font
Format:	GS f n n=0 Font A n=1 Font B Note: this assumes that your receipt printer comes with 2 built-in barcode fonts.
PHP sample code:	fwrite($handle, chr(hexdec('1D')).'f'.chr(0));

GS H

Description:	Sets the position of where you want to print the barcode text
Format:	GS H n n=0 Don't print any text n=1 Above the barcode n=2 Below the barcode n=3 Both above and below the barcode
PHP sample code:	fwrite($handle, chr(hexdec('1D')).'H'.chr(2));

GS w

Description:	Sets the width of the barcode
Format:	GS w n n=1 n=2 n=3
PHP sample code:	fwrite($handle, chr(hexdec('1D')).'w'.chr(2));

GS h

GS k

Work in progress ...

Resources on barcodes

Here are some useful links on barcodes:

• UPC-A Specification
• UPC-E Specification
• Create EAN, UPC and ISBN Barcodes as jpg image
• Online conversion of UPC-E to UPC-A and Check Digit Calculator

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