Epson GT-6500 EN - Manual (Page 146)

ESC M Set color correction
Format: B3 B4 B5
Command: ASCII: ESC M
Decimal: 27 77
Hexadecimal: 1B 4D
Parameter: i
Handshaking:
1 ESC M command
2 ACK code
3 Parameter (i)
4 ACK code
Parameter range:
i = 10
H
(0) : For color impact dot matrix printers
i = 01
H
(1) : User defined value
i = 20
H
(32) : For color thermal transfer printers
i = 40
H
(64) : For color ink jet printers
i = 80
H
(128) : For color CRT displays
Default value: i = 80
H
Explanation:
This command specifies the color correction to suit the selected type
of color output device.
3-52 Command Reference