Understanding How Scsi Interfaces Work - Epson GT-12000 User Manual

Understanding how SCSI interfaces work

For some PCs, you must first install a SCSI board in your
computer. Then follow the directions below to connect your
scanner and computer. All Macintosh computers have built-in
SCSI ports; you do not need to install a SCSI board. Follow the
directions below to connect the scanner to your PC or
Macintosh.
SCSI connections
The SCSI interface allows you to connect up to eight devices,
including the computer, in what is called a "daisy chain"
arrangement. Only the first SCSI device in a daisy chain is
connected to the computer; each of the other devices is
connected to the previous device.
Each device has a SCSI ID number: the computer is usually
number 7, and each of the other devices must have a different
number between 0 and 6. Also, the first device and the last
device in the chain (not including the computer) must have a
terminator. No other device can have a terminator or if a
terminator does exist, it must be turned off. The scanner has
two 50-pin SCSI connectors and a built-in terminator that can
be turned on or off.
If you connect the scanner directly to the Macintosh, you
need a SCSI cable with a 25-pin connector on one end (for the
computer) and a 50-pin connector on the other end (for the
scanner). If you connect the scanner to another SCSI device, use
a SCSI cable with 50-pin connectors on both ends.
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Setting Up the Scanner