Epson GT-6500 EN - Manual (Page 112)

Data Form Definition Commands
ESC C Set color mode
Format: B1 B2 B3 B4 B5 A5
Command: ASCII: ESC C
Decimal: 27 67
Hexadecimal: 1B 43
Parameter: i
Handshaking:
1 ESC C command
2 ACK code
3 Parameter (i)
4 ACK code
3-18 Command Reference