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Python library to manipulate ESC/POS Printers

Project description

Python library to manipulate ESC/POS Printers.

1. Dependencies

In order to start getting access to your printer, you must ensure you have previously installed the following python modules:

  • pyusb (python-usb)
  • Pillow

2. Description

Python ESC/POS is a library which lets the user have access to all those printers handled by ESC/POS commands, as defined by Epson, from a Python application.

The standard usage is send raw text to the printer, but in also helps the user to enhance the experience with those printers by facilitating the bar code printing in many different standards, as well as manipulating images so they can be printed as brand logo or any other usage images migh have.

Text can be aligned/justified and fonts can be changed by size, type and weight.

Also, this module handles some hardware functionalities like, cut paper, carrier return, printer reset and others concerned to the carriage alignment.

3. Define your printer

Before start create your Python ESC/POS printer instance, you must see at your system for the printer parameters. This is done with the ‘lsusb’ command.

First run the command to look for the “Vendor ID” and “Product ID”, then write down the values, these values are displayed just before the name of the device with the following format:

xxxx:xxxx

Example:

Bus 002 Device 001: ID 1a2b:1a2b Device name

Write down the the values in question, then issue the following command so you can get the “Interface” number and “End Point”

lsusb -vvv -d xxxx:xxxx | grep iInterface lsusb -vvv -d xxxx:xxxx | grep bEndpointAddress | grep OUT

The first command will yields the “Interface” number that must be handy to have and the second yields the “Output Endpoint” address.

By default the “Interface” number is “0” and the “Output Endpoint” address is “0x82”, if you have other values then you can define with your instance.

4. Define your instance

The following example shows how to initialize the Epson TM-TI88IV

NOTE: Always finish the sequence with Epson.cut() otherwise you will endup with weird chars being printed.

from escpos import *

""" Seiko Epson Corp. Receipt Printer M129 Definitions (EPSON TM-T88IV) """
Epson = escpos.Escpos(0x04b8,0x0202,0)
Epson.text("Hello World")
Epson.image("logo.gif")
Epson.barcode
Epson.barcode('1324354657687','EAN13',64,2,'','')
Epson.cut()

or use with statement:

with EscposIO(printer.Network('192.168.1.87', port=9100)) as p:
    p.set(font='a', codepage='cp1251', size='normal', align='center', bold=True)
    p.printer.set(align='center')
    p.printer.image('logo.gif')
    p.writelines('Big line\n', font='b')
    p.writelines(u'Привет', color=2)
    p.writelines(u'BIG TEXT', size='2x')

# after exit of with, printer cut paper

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