I am using QZ Tray tool to send raw data to thermal printer using ESC/POS commands. This is the code I'm using and it's working as expected on most printers:
data = [
"\x1b\x40",
"\x1b\x74\x49", // ESC t 73 - switch to Windows-1251
text + "\r\n",
"\x1B\x74\x48", // ESC t 72 - switch to Windows-1250
text + "\r\n",
];
let config = qz.configs.create('printer_name', { encoding: 'windows-1251' });
qz.print(config, print_data).catch(function(e) {
console.error(e);
});
The issues I am having are with Birch CP-Q3 printer. This printer doesn't seem to execute ESC t n command if the n is greater than 33. Like that it doesn't recognize those code pages. Command ESC t n works fine if the n is less than 33.
Strangest thing is that I can switch code page to 73 for example using printer tool, but it can't be done using ESC/POS commands. Printer self test also contains those code pages.
Is there a command that I should execute before changing code page or a printer configuration that I can change so that extended code pages can be used?
I emailed Birch-POS support and they say the following:
Please suggest customer to use command
\x1F\x1B\x1F\xFF\x49to set codepage to windows-1251.
Which matches the OPs wireshark comment, quoting:
Using wireshark I managed to get the following HEX dump when setting code page 73 using printer tool:
1f 1b 1f ff 49 ...
Unfortunately, JavaScript (specifically, UTF-8) does not like certain escape sequences over x7F.
The working code should look like this:
var text = 'Привет мир';
// Use QZ's hex mode, which can workaround JavaScript not allowing certain hex values
var data = [
{
type: 'raw',
format: 'command'
flavor: 'hex',
data: 'x1Fx1Bx1FxFFx49', // Instruct Birch POS: Windows-1251
// data: 'x1Fx1Bx1FxFFx48', // Instruct Birch POS: Windows-1250
},
text + '\r\n'
];
// Tell Java to use a strict 8-bit encoding
var config = qz.configs.create('printer_name', { encoding: 'ISO-8859-1' });
qz.print(config, print_data).catch(function(e) {
console.error(e);
});