15
Appendix D: Base Plate Feature
Figure D1: Overall view of base plate
Appendix E: USB data reporting format
The USB report has two formats, depending on if boot or report protocol is enabled. The following format is the boot
protocol and is understood by a USB aware BIOS.
Bit
7
Bit
0
Byte 0
0
0
0
0
0
Middle
Right
Left
Byte 1
X
X
X
X
X
X
X
X
Byte 2
Y
Y
Y
Y
Y
Y
Y
Y
The following is the USB report protocol format and allows the additional wheel movement information in the fourth
byte. When the wheel is moved forward the fourth byte reports a 0x01, and when moved backward the fourth byte
reports 0xFF. When the wheel is idle, then this byte is assigned 0x00.
Bit
7
Bit
0
Byte 0
0
0
0
0
0
Middle
Right
Left
Byte 1
X
X
X
X
X
X
X
X
Byte 2
Y
Y
Y
Y
Y
Y
Y
Y
Byte 3
Z
Z
Z
Z
Z
Z
Z
Z
