Character set: Umlauts and Euro symbol
Which character set to choose if a network printer prints ä, ö, ü or the € symbol incorrectly.
Prerequisite: The character set is only available for the network printer (ESC/POS) type. With Epson printers, the cash register sets it automatically.
Not every receipt printer understands umlauts and the Euro symbol the same way. If strange characters appear on the receipt instead of "Käse" (cheese) or the € symbol is missing, you need to change the character set.

Select character set
Open the printer settings under Overview (house icon in the top left) → Settings → Printers, tap the line under Character Set and select an entry. Save with the checkmark (Android: Save).
Windows-1252 (Standard) – compatible with Epson, Star, Citizen and Bixolon.
UTF-8 – for printers that swallow umlauts or € characters, usually Sunmi.
GB18030 – only if UTF-8 doesn't work. Umlauts and ß are often not displayed correctly with this format.
After each change, perform a test print. It will print "ÄÖÜäöüß €". If the characters are displayed clearly, the character set is correct. On your iPhone or iPad, first save the file, then reopen the printer and test again.