Ratoc Systems CBU2 User Manual - 4. Connecting A Usb Device

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4. Connecting a USB device

4-1. Self-power device/Bus-power device

              There are two kinds of USB devices:

               1.Self-power device:

                  This type of USB device gets power necessary to work itself through an outlet.

               2.Bus-power device:

                  This type of USB device gets power necessary to work itself through an USB cable.

                  Each USB device of this type has its own current necessary to work itself. The maximum

                  current is 500mA. Here is an example.(Contact your device manufacturer for other devices)

                   Device                            Manufacurer           Model name                consumption current

                  •Mouse                           Microsoft                IntelliMouse                          100mA

                  •ImageScanner              Cannon                    FB636U/630U                      500mA

                  •CompactFlash Reader  RATOC                   CF03U

         100mA

                  •SmartMedia Reader     RATOC                   SMA03U                              100mA

4-2. Connecting a Bus-powered type of USB device to the CBU2

                  The CBU2 has two USB ports and these ports can provide 300mA in total. If you

                  connect our AC Adapter(Solf Separately) to the CBU2U, the two ports can provide

                 500mA at each port. If you connect a Bus-powered type of USB device of which

                  cunsumption current is over 300mA, you need to use the AC Adapter(Sold Seperately.

                  Refer to Chapter 8 for purchase information). You don’t need to purchase it if you connect

                  a Bus-powered type of USB device of which consumption current is less than 300mA.

                 Here is an example.

                  •If you connect FB636U/630U made by Cannon described above, its consumption current

                   exceed 300mA. Therefore, you need to use the AC Adapter to provide 500mA.

                  •If you connect CF03U and SMA03U simultaneously, their consumtion current is 200mA

                   in total. Therefore, you don’t need to use the AC Adapter. You can use them without

                 the AC Adapter.