Fujitsu M3097DG Oem Manual page 133

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DTC mode: byte 2F
X'A6' is set when the power is turned on.
This byte is valid when IPC-2D or IPC-3D option is installed, and byte 3E is X'40'.
MSB
7 6 5 4 3
LSB
2 1 0
DTC
Threshold curve
00 Ordinary image
10 High contrast image (Ex. Newspaper)
Smoothing mode
Filtering
000 Light
001 For OCR
010 (Darken more and more)
011
100
101 Dark
110 Dark
For Image scanner
111 Light
Gradation
00 For OCR
01 For Image scanner
10
Not defined
11
0 : Ball-point pen mode
1 : Ordinary mode
A.4 Commands
Appendix A-63