Epson GT-6500 EN - Manual (Page 139)

Image Processing Commands
ESC B Set halftoning mode
Format: B1 B2 B3 B4 B5 A5
Command:ASCII: ESC B
Decimal: 27 66
Hexadecimal: 1B 42
Parameter: i
Handshaking:
1 ESC B command
2 ACK code
3 Parameter (i)
4 ACK code
Command Reference 3-45