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Adaptec SCSI Card 19160 User's Reference
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 19160) installed in a computer
and one or more SCSI devices. SCSI cables are used to connect the
devices to the SCSI adapter card.
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 19160, as well as the
Adaptec SCSI Card 19160 itself, must be assigned a unique SCSI ID
number from 0 to 15. 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 device's 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 config-
uring 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 don't have to be sequential, as long as the
Adaptec SCSI Card 19160 and each device has a different num-
ber. For example, 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, 15 to 8.
The Adaptec SCSI Card 19160 is preset to SCSI ID 7 and should
not be changed. This gives it the highest priority on the SCSI
bus.
Most internal SCSI hard disk drives come from the factory pre-
set to SCSI ID 0.
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Troubleshooting
