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CHAPTER 2
V. INTERFACE
A. USB
1. Outline of USB standard
CanoScan 9900F 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 127 devices to a single host computer by using "hub".
3. USB has three data transfer modes including "full speed mode" at 12Mbps, "low speed
mode" at 1.5Mbps, and "high speed mode" at 480Mbps (new standard of USB 2.0.)
CanoScan 9900F supports USB2.0's "high speed mode".
4. Hot plug (connectable/disconnectable with power supplied) is available.
5. Power source is supplied via USB.
2. Signal Definitons
USB uses only two identification signal lines (D+ and D-) to communicate with the host
computer.
Pin
Shell
3. Interface Connection
USB connector has two plugs: A plug for upper layer and B plug for lower layer.
2 - 18
Signal
1
V
BUS
2
D-
3
D+
4
Signal GND
Chassis GND
Table 2-2
A Plug
To Host Computer
Figure 2-18
COPYRIGHT 2003 CANON INC. CANOSCAN 9900F REV.0 FEB. 2003 PRINTED IN JAPAN (IMPRIME AU JAPON)
Chassis
2
1
3
4
B Plug
To Scanner
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