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

Description:	Sets the height of the barcode
Format:	GS h n where n is between 1 and 255. Each n corresponds to approximately 0.14mm, or 1/180 inch. n=60 n=80 n=100
PHP sample code:	fwrite($handle, chr(hexdec('1D')).'h'.chr(100));

GS k

Please refer to the following article for details: How to print barcode using GS k (ESC/POS Command)

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

User reviews   Average user ratings:    3.0   (from 3 users)

1. RM Flagg
   October 03, 2008 2:13pm
   Any chance on finishing?
   

   So far, this was a big help in getting a TM-T88III to print using Linux Bash scripts. I can get everything to work *except* bar codes using GS k and everything that goes with it.
   Any chance of finishing GS k?
   Thanks!

2. kksou
   October 05, 2008 6:56pm
   
   

   Hi RM,
   
   Thanks for the reminder. I've been busy adding some other new stuff to this site that I forgot about this!
   
   Will try to dig out the manual and finish that off.
   
   Regards,
   /kksou

3. kksou
   October 08, 2008 6:40am
   
   

   ok. it's done!
   
   Regards,
   /kksou

Note: You have to be a registered member to leave a comment. Free registration here.