Printer not parsing ESCPOS from python correctly

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Bug description

My printer doesn’t seem to be accepting the ESCPOS commands being sent by python-escpos in the correct manner. Don’t get me wrong, it seems to be having a valiant go at it, but it’s not making much headway. For instance, Epson.barcode('1324354657687','EAN13',64,2,'','') prints aw1324354657687 on the printer, and any of the .set() commands simply make the text tiny and occasionally miss some letters. It’s a bit of a weird one - any ideas?

Device info

Printer: Generic 58mm Thermal Reciept Printer POS-5890K set up on /dev/usb/lpt0

python-escpos version: 2.1.3

python version: 3.4.2

operating system: Raspbian Jessie Lite

[mashedkeyboard]

p.control("CR") doesn’t work either - for instance, the script

from escpos import *
p = printer.Usb(0x0416,0x5011)
p.text("Hello,")
p.control("CR")
p.text("Curtis")
p.cut()

actually outputted ello,tis exactly like that (no carriage return whatsoever).

And now my desk is full of tiny sheets of thermal paper!

[blutme]

Hey,

I’ve just ported an example from this project’s PHP sibling which includes a similar set of features (images, some basic formatting, and line breaks). Maybe you can start by printing this, then refactoring to match your expected output? The picture below is output from a ZJ 5890T.

Note that the command for “bold” that we send here appears to be ignored by this printer, but will work on other ESC/POS printers. I haven’t dug into it, but double-width is a good substitute that should get you on track.

Image:

Code:

#!/usr/bin/env python
from escpos import printer

# A wrapper to organise item names & prices into columns
class item:
    def __init__(self, name="", price="", dollarSign=False):
        self.name=name
        self.price=price
        self.dollarSign=dollarSign

    def encode(self):
        rightCols = 6
        leftCols = 24
        if(self.dollarSign):
            leftCols = leftCols / 2 - rightCols / 2
        left = self.name.ljust(leftCols)
        sign = "$" if self.dollarSign else ""
        right = (sign + self.price).rjust(rightCols)
        return (left + right + "\n").encode()

# Information for the receipt
items = [
    item(name="Example item #1", price="4.00"),
    item(name="Another thing", price="3.50"),
    item(name="Something else", price="1.00"),
    item(name="A final item", price="4.45")
]
subtotal = item(name="Subtotal", price="12.95")
tax = item(name="A local tax", price="1.30");
total = item(name="Total", price="14.25", dollarSign=True);

# Date is kept the same for testing
date = "Monday 6th of April 2015 02:56:25 PM";

# Start the printer
p = printer.File("/dev/usb/lp0")

# Print top logo
p.set(align="center")
p.image("escpos-php.png", impl="bitImageColumn")

# Name of shop
p.set(align="center", width=2)
p.text("ExampleMart Ltd.\n");
p.set(align="center")
p.text("Shop No. 42.\n")
p.text("\n")

# Title of receipt
p.set(align="center", text_type="B")
p.text("SALES INVOICE\n");

# Items
p.set(align="left", text_type="B")
p.text(item(name="", price="$"));
p.set(align="left")
for item in items:
    p.text(item);
p.set(text_type="B")
p.text(subtotal);
p.text("\n")

# Tax and total
p.set()
p.text(tax);
p.set(width=2);
p.text(total);

# Footer
p.text("\n\n")
p.set(align="center")
p.text("Thank you for shopping at\nExampleMart.\n");
p.text("For trading hours, please visit example.com\n");
p.text("\n\n")
p.text(date + "\n");

# Cut the paper
p.cut()

Binary blob: receipt-with-logo-zj5890t-pythonescpos.zip

for python 3.7+ and 3nStar RPT008 THERMAL PRINTER:

you must add usb library:

from escpos.printer import Usb

and change the line 38 for this:

p = Usb(0x1fc9, 0x2016, 0) “Vendor ID” and “Product ID”, you found with: >lsusb

and 16 for this:

leftCols = leftCols / 2 - rightCols / 2 leftCols = int(leftCols)