The "D" suffix can vary by region. Always check the printer’s exact model sticker (e.g., TM-U220D, TM-U220PD, TM-U220UD) to confirm interfaces.
This is the primary selling point of the TM-U220D. Thermal paper turns black when exposed to heat. If you put a thermal receipt on a hot grill or leave it in a sweltering kitchen, the text becomes unreadable. epson tmu 220d