Canon CanoScan FS2720U Product Manual - Page 13

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Connecting to a Computer

This topic discusses USB connectors and methods for connecting more than one USB device to

your computer.

What is the USB Interface?

USB, the acronym for universal serial bus, is an interface for connecting various

peripheral devices to your computer. It is easier to use than the serial and parallel

interfaces that were widely used before the debut of the USB interface because it

allows devices to be hot-swapped (attached or detached with the power on) and

the connection and settings adjustments are simple. The USB interface can also

accommodate a large number of devices (up to 127). This scanner supports the

USB interface for Windows 98 SE, Windows 2000, and Windows Me, as well as for

Macintosh computers (Mac OS 8.6 or higher) equipped with built-in USB ports.

USB Connectors

There are two types of USB connector: A (flat, larger) and B (almost square,

smaller). The A type is generally reserved for the computer port and the B for the

device port.

A Type Connector

Used for the computer's USB

port

Connecting Multiple USB Devices

When the USB ports on a computer are already in use, additional USB devices

can be connected to an unoccupied USB port on one of the devices or to a USB

hub (a device that expands a single port in several). Please note, however, that

the scanner performance is not guaranteed when connected via a USB hub.

Configuration

Without a USB Hub

Computer

USB

Device

Configuration

With a USB Hub

Computer

USB Hub

USB

Device

USB

Device

CanoScan FS2720U Film Scanner

B Type Connector

Used for the device's USB

port

USB Hub

A device for expanding the

number of USB ports

The number of connectable devices

can be gradually expanded by attach-

ing additional hubs together until the

maximum capacity is reached. How-

ever, all the devices may not be

operable at once.

USB

Device