CHAPTER 2
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COPYRIGHT
2002 CANON INC. CANOSCAN 8000F REV.0 OCT. 2002 PRINTED IN JAPAN (IMPRIME AU JAPON)
B. Signal Definitions
USB uses two differential signal lines (D+ and D-) only to communicate with the host
computer.
Table 2-2
C. Interface Connection
USB connector has A plug for connecting to upper layer and B plug for connecting to lower
layer.
Figure 2-18
V. INTERFACE
A. Outline of USB Standard
CanoScan 8000F employs USB2.0.
Features of USB include;
1. USB is an interface to connect peripheral devices to a host computer.
2. Tree-structure can connect up to 127 devices on a host computer by using "hub".
3. USB has three data transfer modes of "full speed mode" at 12Mbps, "low speed mode" at
1.5Mbps, and "high speed mode" at 480Mbps (new standard of USB 2.0.)
CanoScan 8000F supports USB2.0's "high speed mode".
4. Hot plug (connectable/disconnectable with the power ON) is available.
5. Power source is supplied via USB.
A Plug
To Host Computer
B Plug
To Scanner
Signal
V
BUS
D-
D+
Signal GND
Chassis GND
Pin
1
2
3
4
Shell
Chassis
1
2
3
4