Thermal printers: Difference between revisions

Revision as of 12:52, 6 November 2023

a.k.a. receipt printers

We have the following thermal printers at XPUB:

Plug the USB into your computer or server first.

In Linux/Mac, the printer should appear at one of the /dev/ sockters, which should be a path similar to:

/dev/usb/lp0

Try to send some text to the printer:

$ echo "hello" > /dev/usb/lp0

If you get an permission denied error, you can check the permissions of the socket of the printer:

$ ls -la /dev/usb/lp0

Which returns something like the following:

crw-rw---- 1 root lp 180, 2 Nov  6 12:48 /dev/usb/lp2

In this case, the printer socket is owned by the user root and by the group lp.

With the groups command you can check if you are part of the lp group:

$ groups

If not, you can add yourself with:

$ sudo addgroup USERNAME lp

from escpos.printer import Network
kitchen = Network("145.24.131.103") 
#EPSON Receipt Printer. Printer IP Address will be spit out when plugged

@@ Line 6: / Line 6: @@
 [[File:Epson-tm20III-at-xpub.jpg|thumb|right]]
+===Command line===
+Plug the USB into your computer or server first.
+In Linux/Mac, the printer should appear at one of the <code>/dev/</code> sockters, which should be a path similar to:
+ /dev/usb/lp0
+Try to send some text to the printer:
+ $ echo "hello" > /dev/usb/lp0
+If you get an '''permission denied''' error, you can check the permissions of the socket of the printer:
+ $ ls -la /dev/usb/lp0
+Which returns something like the following:
+ crw-rw---- 1 root lp 180, 2 Nov  6 12:48 /dev/usb/lp2
+In this case, the printer socket is owned by the user <code>root</code> and by the group <code>lp</code>.
+With the <code>groups</code> command you can check if you are part of the <code>lp</code> group:
+ $ groups
+If not, you can add yourself with:
+ $ sudo addgroup USERNAME lp
 ===Python, using the network===