background image
ASUS PCI-AS300 User's Manual
4. SCSI ID Numbers & Termination
You must set the SCSI identification numbers and properly terminate the SCSI bus
before you can use the adapter and any peripherals connected to it.
SCSI ID Numbers
Each device on a SCSI bus must have a unique identification number. All SCSI
devices have some means of setting the ID number for the device. The SCSI adapter
must also have an ID number. The default number for the PCI-AS300 is 7. You
should use this unless you know there is a specific need to change it. Consult the
documentation for any other SCSI devices to see how to set their ID numbers. The
recommended numbers are:
SCSI Host Adapter:
7 (Default)
SCSI Hard Disk Boot Device:
2nd SCSI Hard Disk:
Devices connected to the 8-bit Fast SCSI bus can have numbers from 0 to 7. The
16-bit Wide SCSI bus allows numbers from 0 to 15. SCSI devices vary in how they
set the ID number. Some use jumpers, others have some kind of selector switch.
Refer to the documentation for any devices you install for details on how to set the
SCSI ID number.
SCSI Termination
Both ends of the SCSI bus must be terminated in order for the bus to operate prop-
erly. Since this card only supports internal devices, the SCSI adapter must be at one
end of the bus and must be terminated. The device on the other end of the bus daisy
chain must also be terminated.
Since this card supports two SCSI buses, the card termination can be set up to termi-
nate either one or both buses. The WIDE SCSI bus is divided into "Low" and "High"
bytes, the Low part being equivalent to the 8-bit Fast SCSI bus. If you will use both
SCSI connectors, you must change the default setting. The required settings are
shown in the chart below.
Connector/Bus Used
50-pin connector only
ON (Default)
68-pin connector only
ON (Default)
50-pin & 68-pin connector