Use netcat to send a simple text test to an Ethernet POS8220:
Desperate, the manager searched for a lifeline, eventually finding the ZJ-8220 driver
At 2:48 a.m., a delivery order blinked on Marcus’s tablet. He tapped “Print” and the tablet replied with a blank stare: “Printer not found.” The screen showed the POS8220 listed but tagged “Driver not installed.” Marcus cursed under his breath. He’d upgraded the tablet last month and the old printer hadn’t come with the right driver. Ordinarily he’d sort it the next day, but tonight the line of deliveries was long and the coffee was cooling.
If the method above does not work, or if you need the specific configuration tool, you will need the "Zjiang" or general ESC/POS driver package.
You now have everything you need. To recap, the driver for your POS8220 is not a mysterious file from a shady forum. It is the official signed driver from your OEM manufacturer, installed with the correct procedure, and configured for your specific POS ecosystem.