Epson ES-1000C Reference Manual page 116

ESC D
Format:
Command:ASCII:
Parameter:
Handshaking:
1 ESC D command
2 ACK code
3 Parameter (i)
4 ACK code
Parameter range:
i = 01 to 08
H
Default value: i = 01
Explanation:
This command specifies the number of bits that represent a pixel as
the data format, in a range from 1 to 8 bits per pixel per color. As the
value increases, more differences in tone and color can be represented.
3-22
Command Reference
ESC
Decimal:
Hexadecimal:
i
(1 to 8 bit/pixel/color)
H
(1 bit/pixel/color)
H
Set data format
B1 B2 B3 B4 B5 A5
D
27 68
1B 44