Microtech USB XpressSCSI User Manual page 23

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SCSI Addressing
The SCSI standard supports connection from one computer to up to seven SCSI devices. When
more than one SCSI device is connected to your computer it is referred to as a SCSI chain.
Each device in a SCSI chain must be assigned a unique SCSI ID number for proper operation.
Therefore, two devices must not have the same ID number. The SCSI ID is independent of the
order of physical device connection. ID numbers 0 to 6 are available for other SCSI devices.
Note: You cannot use the same ID number more than once in a SCSI chain.
1.
Turn off the power to your SCSI device(s) prior to changing the SCSI ID's. The new
number will not become effective while power is still on
2.
Assign a SCSI ID number between 0 and 6 to each device in the chain. Your SCSI
device(s) will feature either an ID switch, panel, or other method allowing you to change
the SCSI address. Some devices only permit a choice of ID numbers rather than the full
range of 0-6. For information on setting the SCSI ID for your device refer to the related
SCSI device manual.
SCSI Termination
A SCSI terminator is a device which blocks stray SCSI signals in a chain to ensure a reliable con-
nection. SCSI termination is required whether you have just one or many SCSI devices connect-
ed. Termination is usually applied to the last device in a SCSI chain to complete the connection.
Termination can be applied via switches or via external attachments (see illustration below) for
devices without built-in termination.
23
External SCSI Terminator may
be required in certain SCSI chains
(actual appearance may vary).
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