Epson TM-U220* Printer Driver

A TypeScript driver for the Epson TM-U220* receipt printers. Since it uses standard ESC/POS commands, it may work with other compatible printers as well. I only tested it with the TM-U220IID model.

For general ESC/POS printer usage, I recommend using the escpos package. This driver is intended for cases where you need a minimal, specialized solution specifically for TM-U220* series printers.

Installation

npm install epson-tm-u220iid-driver

Usage

Basic Example

import PrinterBuffer, { Alignment, TextSize } from 'epson-tm-u220iid-driver';

const printer = new PrinterBuffer({
    portPath: '/dev/tty.usbserial',  // Your serial port path
    baudRate: 9600,                  // Optional, defaults to 9600
    autoOpen: true                   // Optional, defaults to true
});

// Simple print job
await printer
    .init()
    .text('Hello World!')
    .print();

// Formatted print job
await printer
    .init()
    .align(Alignment.CENTER)
    .size(TextSize.DOUBLE_HEIGHT)
    .text('Double height')
    .align(Alignment.LEFT)
    .init()
    .text('Regular text')
    .feed(3)
    .print();

await printer.close(); // Close the port when done

Text Formatting

The driver supports various text formatting options:

// Alignment
printer.align(Alignment.LEFT);
printer.align(Alignment.CENTER);
printer.align(Alignment.RIGHT);

// Text Size
printer.size(TextSize.NORMAL);
printer.size(TextSize.DOUBLE_HEIGHT);
printer.size(TextSize.DOUBLE_WIDTH);
printer.size(TextSize.DOUBLE_BOTH);

API Reference

Constructor Options

interface PrinterOptions {
    portPath: string;    // Path to the serial port
    baudRate?: number;   // Baud rate (default: 9600)
    autoOpen?: boolean;  // Auto-open port (default: true)
}

Methods

• init(): Initialize the printer
• text(text: string): Add text to the buffer
• align(alignment: Alignment): Set text alignment
• size(size: TextSize): Set text size
• feed(lines: number = 2): Feed paper lines
• clear(): Clear the print buffer
• print(): Print the buffer contents
• close(): Close the serial port

Enums

enum Alignment {
    LEFT = '\x1B\x61\x00',
    CENTER = '\x1B\x61\x01',
    RIGHT = '\x1B\x61\x02'
}

enum TextSize {
    NORMAL = '\x1B\x21\x00',
    DOUBLE_HEIGHT = '\x1B\x21\x10',
    DOUBLE_WIDTH = '\x1B\x21\x20',
    DOUBLE_BOTH = '\x1B\x21\x30'
}

Development

# Install dependencies
npm install

# Build the project
npm run build

# Run tests
npm test