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Using the SCSI Interface
This section introduces you to
the
SCSI interface. If you are
unfamiliar with the SCSI interface, be sure to read this entire
appendix thoroughly.
Introducing the SCSI Interface
The SCSI board included in the kit allows you to connect the
ES-300C scanner to an Apple Macintosh computer using the
industry-standard set of hardware and software specifications
known as the Small Computer System Interface (SCSI).
This fast, simple interface was pioneered by Shugart and Associates
and was originally called the Shugart Associates System Interface
(SASI). The American National Standards Institute modified and
added to the SASI specifications and renamed it SCSI. This interface
has undergone several revisions and is currently defined by ANSI
specifications X3.131-1986.
The SCSI interface allows you to connect up to eight devices,
including the computer, in what is called a
daisy chain
arrangement.
All devices connected through the interface are assigned a SCSI ID
number so that they can recognize each other. When you use
multiple SCSI devices, you need to pay attention to the terminators
that affect the arrangement of the devices along the SCSI daisy
chain. SCSI ID
S
and terminators are explained in more detail in the
following sections.
Setting the SCSI ID
The factory set SCSI ID of the scanner’s SCSI board is 2. The
computer is always ID number 7. You must assign any other devices
a unique ID number between 0 and 6. If you are going to add the
scanner to a system in which
one
of your SCSI devices already has a
SCSI ID of 2, you must change the ID number of either that device
or the SCSI board.
C-2
Connecting the Scanner to a Macintosh