Epson ActionScanner II - Manual (Page 7)

If the scanner comes on when you plug it in, turn it off by
pressing the OPERATE button.
Warning:
Whenever you
turn
off the scanner, wait at least 10 seconds
before turning it back on. Rapidly turning it on and off can
damage the scanner.
Connecting the Scanner to Your
Macintosh
Follow the steps below to connect the scanner directly to the
SCSI port on your Macintosh using the SCSI cable included
with the scanner. This cable has a 25-pin connector on one end
and a 50-pin connector on the other. The SCSI ID is already set
to 2 and the SCSI terminator is on.
If you are already using the SCSI port on your computer for
another SCSI device, such as an external hard disk, you need a
SCSI cable with a 50-pin connector on both ends. You can then
connect the scanner to your other SCSI device and set the SCSI
ID and terminator as necessary; follow the instructions in
Chapter 1 of your scanner User’s Guide.