USB receipt printer and cash drawer

On a PC till, USB thermal printers talk ESC/POS through Web Serial. Pair once per browser profile. After the port is open, printing works offline.

1. 1

   Open Thermal printer

   Profile → Preferences → Thermal printer. Needs settings.manage. Chrome or Edge on desktop — not Firefox, and not a phone browser.

2. 2

   Connect USB printer

   Plug in the printer, tap Connect USB printer, pick the device. Set paper width (58 mm / 32 cols or 80 mm / 48 cols) and baud to match the hardware.

3. 3

   Test

   Print test sends a StockDey page and cut. Test drawer sends the kick pulse. Fix cable, baud, or driver if nothing happens.

Till behaviour

• Open cash drawer on cash sales — pulse when a thermal receipt includes cash.
• Auto-print after each sale — USB print when the receipt modal opens on this PC.
• You can still print from the receipt or a sale detail if auto-print is off.