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1-8
Adaptec Ultra320 SCSI Cards Users Guide
Understanding SCSI
SCSI (pronounced scuzzy) stands for Small Computer Systems
Interface. SCSI is an industry standard computer interface for
connecting SCSI devices (such as a hard disk drive, CD-ROM
drive, or scanner) to a common SCSI bus.
A SCSI bus is an electrical pathway that consists of a SCSI adapter
card (such as the Adaptec SCSI Card) installed in a computer and
one or more SCSI devices. SCSI cables are used to connect the
devices to the SCSI adapter card. The Adaptec SCSI Card has up to
two independent SCSI buses (channels).
For the SCSI bus to function properly, a unique SCSI ID must be
assigned to the SCSI card and each SCSI device connected to it, and
the SCSI bus must be properly terminated.
SCSI IDs
Each device attached to the Adaptec SCSI Card, as well as the
Adaptec SCSI Card itself, must be assigned a unique SCSI ID
number from 0 to 15 for each of the two SCSI buses. A SCSI ID
uniquely identifies each SCSI device on the SCSI bus and
determines priority when two or more devices are trying to use the
SCSI bus at the same time.
Refer to the devices documentation to set the SCSI ID. Here are
some general guidelines for SCSI IDs:
For internal SCSI devices, the SCSI ID usually is set by
configuring a jumper on the device.
For external SCSI devices, the SCSI ID usually is set with a
switch on the back of the device.
SCSI ID numbers do not need to be sequential, as long as the
Adaptec SCSI Card and each device has a different number. For
example, on each of the two SCSI buses you can have an
internal SCSI device with ID 0, and an external SCSI device with
ID 6.
SCSI ID 7 has the highest priority on the SCSI bus. The priority
of the remaining IDs, in descending order, is 6 to 0, then 15 to 8.
U320 UG.book Page 8 Tuesday, September 23, 2003 1:47 PM
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