AGFA Scanner - Manual (Page 15)

Chapter 2 — Installing the scanner 15
SCSI devices
SnapScan is a Small Computer System Interface (SCSI) device. It communicates with your computer
by using the SCSI-2 standard. The SCSI communication standard allows you to have up to seven
peripheral devices connected to your computer.
Before connecting the SCSI devices you should always make sure that your computer and all SCSI
devices are switched off. If the computer or any of the devices remains on, you could damage the
computer or the SCSI device(s).
A unique SCSI ID number is assigned to each device in the SCSI chain enabling your computer to
identify the device it wants to communicate with and the priority of each device.
A SCSI chain requires an electronic component called a ‘terminator’ which absorbs old signals
traveling along the cables and keeps the path open for new signals. The chain should never have
more than two terminators, one at each end. It is important to remember that using too many or too
few terminators may damage your SCSI devices. Some SCSI devices have built-in terminators and
must therefore be placed at the beginning or end of your SCSI chain.
❖ Note: Your SnapScan does not have a built-in terminator. If you don’t have a terminator, please
contact your dealer.
Caution: If two SCSI devices have the same ID number, your system will not work properly and you may
damage your SCSI devices.
To avoid crashes, never use extension cables for SCSI cables.