base4sistemas / Pyescpos
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PyESCPOS
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A Python support for Epson |copy| ESC/POS |reg| compatible printers. Read more
at Epson ESCPOS FAQ
_ (PDF document).
The ESC/POS |reg| is a standard that every manufacturer work on and modify to suit their needs. That way, a sequence of commands in one printer does not necessarily works (or does not work as expected) on another. At a distance, you can say that all those tricky commands are identical from model to model (a standard), but when you look just a little bit more deeper, you quickly realize that they can be completely different, even between models belonging to the same manufacturer.
This project aims to simplify the usage of printers, seeking for a lowest common denominator between needed features and providing implementations that meet this minimum for known models, so you do not have to modify the application code.
Current Implementations
Current implementations was tested against following hardware:
+-------------------------+-------------------+-------------------+-----------------------------------------+
| Manufacturer | Models | Firmware Versions | Notes |
+=========================+===================+===================+=========================================+
| Bematech S/A
_ | MP-2800 TH | 2.2.1BQL | |
| | | | |
+-------------------------+-------------------+-------------------+-----------------------------------------+
| Bematech S/A
_ | MP-4200 TH | 1.3, 1.6 | |
| | | | |
+-------------------------+-------------------+-------------------+-----------------------------------------+
| Epson
_ | TM-T20 | 1.14 | |
| | | | |
+-------------------------+-------------------+-------------------+-----------------------------------------+
| Elgin
_ | Elgin i9 | 1.03.20, | |
| | | 1.03.24, | |
| | | 1.03.31 | |
+-------------------------+-------------------+-------------------+-----------------------------------------+
| Elgin
_ | Elgin i7 | 1.00.08 | |
| | | | |
+-------------------------+-------------------+-------------------+-----------------------------------------+
| Elgin
_ | Elgin RM-22 | 1.00.09 | Elgin RM-22 portable thermal mini |
| | | | printer |
+-------------------------+-------------------+-------------------+-----------------------------------------+
| Nitere
_ | NPDV-1020 | - | Multifunction Terminal model TMF-101/IG |
| | | | (an alias for CB55-C model) |
+-------------------------+-------------------+-------------------+-----------------------------------------+
| Unknown OEM | CB55-C | 1.3.5 | Embedded in Nitere
_ NPDV-1020 (model |
| | | | TMF-101/IG) |
+-------------------------+-------------------+-------------------+-----------------------------------------+
| Urmet Daruma
_ | DR700 L/H/M and | 02.51.00, | |
| | DR700 L-e/H-e | 01.20.00, | |
| | | 01.21.00 | |
+-------------------------+-------------------+-------------------+-----------------------------------------+
| Urmet Daruma
_ | DR800 L/H | 03.13.01 | |
| | | | |
| | | | |
+-------------------------+-------------------+-------------------+-----------------------------------------+
You can get a list of all available implementations with the following snippet:
.. sourcecode:: python
from escpos import helpers
for impl in helpers.find_implementations(sort_by='model.name'):
print('{:.<25} {}'.format(impl.model.name, impl.fqname))
Which produces an output similar to::
Bematech MP-2800 TH...... escpos.impl.bematech.MP2800TH
Bematech MP-4200 TH...... escpos.impl.bematech.MP4200TH
CB55-C................... escpos.impl.unknown.CB55C
Daruma DR700............. escpos.impl.daruma.DR700
Daruma DR800............. escpos.impl.daruma.DR800
Elgin I7................. escpos.impl.elgin.ElginI7
Elgin I9................. escpos.impl.elgin.ElginI9
Elgin RM-22.............. escpos.impl.elgin.ElginRM22
Epson TM-T20............. escpos.impl.epson.TMT20
Generic Daruma........... escpos.impl.daruma.DarumaGeneric
Generic ESC/POS.......... escpos.impl.epson.GenericESCPOS
Generic Elgin............ escpos.impl.elgin.ElginGeneric
Nitere NPDV-1020......... escpos.impl.nitere.NitereNPDV1020
Usage Examples
Network TCP/IP Example
You can connect to your printer through network TCP/IP interface:
.. sourcecode:: python
from escpos import NetworkConnection
from escpos.impl.epson import GenericESCPOS
conn = NetworkConnection.create('10.0.0.101:9100')
printer = GenericESCPOS(conn)
printer.init()
printer.text('Hello World!')
Serial Example
Support for Serial connections is optional. If you need it you should have
PySerial
_ library installed. You may do it through PIP issuing pip install PyESCPOS[serial]
.
Here is how you can make a Serial connection:
.. sourcecode:: python
from escpos import SerialConnection
from escpos.impl.epson import GenericESCPOS
# connect to port 'ttyS5' @ 9600 Bps, assuming RTS/CTS for handshaking
conn = SerialConnection.create('/dev/ttyS5:9600,8,1,N')
printer = GenericESCPOS(conn)
printer.init()
printer.text('Hello World!')
Bluetooth Example
Support for Bluetooth (via RFCOMM) connection is optional. If you need it you
should have PyBluez
_ library installed. One option may be installing PyESCPOS
through PIP issuing pip install PyESCPOS[bluetooth]
.
Here is how you can make a Bluetooth connection:
.. sourcecode:: python
from escpos import BluetoothConnection
from escpos.impl.epson import GenericESCPOS
# uses SPD (service port discovery) services to find which port to connect to
conn = BluetoothConnection.create('00:01:02:03:04:05')
printer = GenericESCPOS(conn)
printer.init()
printer.text('Hello World!')
If you know in which port you can connect beforehand, just pass its number after
device address using a forward slash, for example 00:01:02:03:04:05/4
, will
connect to port 4
on 00:01:02:03:04:05
address.
USB Example
Support for USB connections is optional. If you need it you should have
PyUSB
_ library installed. You may do it through PIP issuing pip install PyESCPOS[usb]
. Be aware for printers with more than one USB interface, so
you may have to configure which interface is active.
Here is how you can make an USB connection:
.. sourcecode:: python
from escpos.ifusb import USBConnection
from escpos.impl.elgin import ElginRM22
conn = USBConnection.create('20d1:7008,interface=0,ep_out=3,ep_in=0')
printer = ElginRM22(conn)
printer.init()
printer.text('Hello World!')
File Print Example
This printer “prints” just into a file-handle. Especially on *nix-systems this comes very handy. A common use case is when you have a parallel port printer or any other printer that are directly attached to the file system. Note that you may want to stay away from using USB-to- Parallel-Adapters since they are extremely unreliable and produce many arbitrary errors.
.. sourcecode:: python
from escpos import FileConnection
from escpos.impl.elgin import ElginI9
conn = FileConnection('/dev/usb/lp1')
printer = ElginI9(conn)
printer.init()
printer.text('Hello World!')
print(printer.device.output)
Dummy Print Example
The Dummy-printer is mainly for testing- and debugging-purposes. It stores all of the “output” as raw ESC/POS in a string and returns that.
.. sourcecode:: python
from escpos import DummyConnection
from escpos.impl.epson import GenericESCPOS
conn = DummyConnection()
printer = GenericESCPOS(conn)
printer.init()
printer.text('Hello World!')
print(printer.device.output)
Printing Barcodes
There is a default set of parameters for printing barcodes. Each ESC/POS implementation will take care of the details and try their best to print your barcode as you asked.
.. sourcecode:: python
from escpos import barcode
from escpos import SerialConnection
from escpos.impl.epson import GenericESCPOS
conn = SerialConnection.create('COM1:9600,8,1,N')
printer = GenericESCPOS(conn)
printer.init()
printer.code128(
'0123456789',
barcode_height=96, # ~12mm (~1/2")
barcode_width=barcode.BARCODE_DOUBLE_WIDTH,
barcode_hri=barcode.BARCODE_HRI_BOTTOM
)
printer.lf()
printer.ean13(
'4007817525074',
barcode_height=120, # ~15mm (~9/16"),
barcode_width=barcode.BARCODE_NORMAL_WIDTH,
barcode_hri=barcode.BARCODE_HRI_TOP
)
printer.cut()
The barcode data you pass as a parameter should be complete including check digits and any other payload data required that makes that data valid for the symbology you're dealing with. Thus, if you need to print an EAN-13 barcode, for example, you need to provide all thirteen digits.
Configuring Resilient Connections
Network (TCP/IP) and Bluetooth (RFCOMM) connections provided by PyESCPOS both
use a simple exponential backoff
_ algorithm to implement a (more) resilient
connection to the device. Your application or your users can configure retry
parameters through environment variables (or files):
-
ESCPOS_BACKOFF_MAXTRIES
(int> 0
, defaults to3
) Number of tries before give up; -
ESCPOS_BACKOFF_DELAY
(int> 0
, defaults to3
) Delay in seconds between retries; -
ESCPOS_BACKOFF_FACTOR
(int> 1
, defaults to2
) Multiply factor in which delay will be increased each retry.
This library may use python-decouple
_ if available to grab those
configuration values from environment variables or from a settings file,
depending on how you have configured decouple
. If not, it falls back to
standard lib os.getenv
.
More Information
You will find more information in the PyESCPOS wiki
_ pages.
You are Welcome to Help
Here is how you setup a development enviroment:
.. sourcecode:: sh
git clone [email protected]:base4sistemas/pyescpos.git
cd pyescpos
python -m venv .env_escpos
source .env_escpos/bin/activate
pip install -r requirements/dev.txt
tox
If you gonna work with a specific type of connection (eg. Bluetooth or Serial)
you may use requirements/bluetooth.txt
or requirements/serial.txt
.
Have a look inside requirements/
directory for the options available.
Acknowledgement
This project is inspired on Manuel F. Martinez work for python-escpos
_
implementation, among other projects, whose specific bits of work (available
here on Github and many other open-source repositories) has helped so much.
Disclaimer
Please, read this disclaimer.
None of the vendors cited in this project agree or endorse any of the
patterns or implementations. Its names are used only to maintain context.
.. Sphinx Documentation: Substitutions at http://sphinx-doc.org/rest.html#substitutions Codes copied from reStructuredText Standard Definition Files at http://docutils.sourceforge.net/docutils/parsers/rst/include/isonum.txt
.. |copy| unicode:: U+00A9 .. COPYRIGHT SIGN :ltrim:
.. |reg| unicode:: U+00AE .. REGISTERED SIGN :ltrim:
.. _PyESCPOS wiki
: https://github.com/base4sistemas/pyescpos/wiki
.. _Epson ESCPOS FAQ
: http://content.epson.de/fileadmin/content/files/RSD/downloads/escpos.pdf
.. _python-escpos
: https://github.com/manpaz/python-escpos
.. _python-decouple
: https://github.com/henriquebastos/python-decouple
.. _PySerial
: https://pyserial.readthedocs.io/en/latest/
.. _PyBluez
: http://karulis.github.io/pybluez/
.. _PyUSB
: https://pyusb.github.io/pyusb/
.. _Epson
: http://www.epson.com/
.. _Elgin
: http://www.elgin.com.br/
.. _Nitere
: http://www.nitere.com.br/
.. _Bematech S/A
: http://www.bematechus.com/
.. _Urmet Daruma
: http://daruma.com.br/
.. _exponential backoff
: https://en.wikipedia.org/wiki/Exponential_backoff