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escpos

ESCPOS npm version

ESC/POS Printer driver for node

NPM

Installation

$ npm i escpos

if you use usb as an adapter :

  • On Linux, you'll need libudev to build libusb.
  • On Ubuntu/Debian: sudo apt-get install build-essential libudev-dev.
  • On Windows, Use Zadig to install the WinUSB driver for your USB device.

Otherwise you will get LIBUSB_ERROR_NOT_SUPPORTED when attempting to open devices.

Example

const escpos = require('escpos');
 
// Select the adapter based on your printer type 
const device  = new escpos.USB();
// const device  = new escpos.Network('localhost'); 
// const device  = new escpos.Serial('/dev/usb/lp0'); 
 
const printer = new escpos.Printer(device);
 
device.open(function(){
 
  printer
  .font('a')
  .align('ct')
  .style('bu')
  .size(1, 1)
  .text('The quick brown fox jumps over the lazy dog')
  .text('敏捷的棕色狐狸跳过懒狗')
  .barcode('12345678', 'EAN8')
  .qrimage('https://github.com/song940/node-escpos', function(err){
    this.cut();
    this.close();
  });
 
});
 
 

USB Adapter methods

open(function calback)

Claims the current device USB, if the printer is already in use by other process this will fail.

By default, the USB adapter will set the first printer found, if you have multiple printers use setDevice and getDevices to switch between printers.

Triggers the callback function when done.

openAll()

Claims all the printers connected to the machine, one by one. When done, sets the first printer found as the default device and triggers the callback function.

getDevices()

Returns the number (N) of printers connected, if open is called you must open each device in order to use it.

The ID of the printer will be the number you want to set from 0 to N-1.

setDevice(N)

Sets the index passed as the current device, N must be higher than 0 and lower than getDevices().

This must be called before printing if you want to swtich between multiple printers connected to the same device.

close(function callback)

Closes the current device and releases its USB interface.

closeAll(function callback)

Similar to close() but loops through all the devices connected and closes them all.


Printer methods

Escpos inherits its methods to the printers. the following methods are defined:

text("text")

Prints raw text. Raises TextError exception.

control("align")

Carrier feed and tabs.

align is a string which takes any of the following values:

  • LF for Line Feed
  • FF for Form Feed
  • CR for Carriage Return
  • HT for Horizontal Tab
  • VT for Vertical Tab

align("align")

Set text properties.

align set horizontal position for text, the possible values are:

  • CENTER
  • LEFT
  • RIGHT

Default: left

font type could be A or B. Default: A width is a numeric value, 1 is for regular size, and 2 is twice the standard size. Default: 1 height is a numeric value, 1 is for regular size and 2 is twice the standard size. Default: 1

barcode("code", "barcode_type", width, height, "position", "font")

Prints a barcode.

code is an alphanumeric code to be printed as bar code barcode_type must be one of the following type of codes:

  • UPC-A
  • UPC-E
  • EAN13
  • EAN8
  • CODE39
  • ITF
  • NW7

width is a numeric value in the range between (1,255) Default: 64 height is a numeric value in the range between (2,6) Default: 3 position is where to place the code around the bars, could be one of the following values:

  • ABOVE
  • BELOW
  • BOTH
  • OFF

Default: BELOW

font is one of the 2 type of fonts, values could be:

  • A
  • B

Default: A

Raises BarcodeTypeError, BarcodeSizeError, BarcodeCodeError exceptions.

cut("mode")

Cut paper.

mode set a full or partial cut. Default: full Partial cut is not implemented in all printers.

cashdraw(pin)

Sends a pulse to the cash drawer in the specified pin.

pin is a numeric value which defines the pin to be used to send the pulse, it could be 2 or 5. Raises `CashDrawerError()``


Thanks


Contributing

  • Fork this repo
  • Clone your repo
  • Install dependencies
  • Checkout a feature branch
  • Feel free to add your features
  • Make sure your features are fully tested
  • Open a pull request, and enjoy <3

MIT license

Copyright (c) 2015 lsong

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.