Sony CDU535 Series Operating Instructions Manual page 11

It is important that only one jumper be set to ON per drive. If you plan
to use more than one CD-ROM drive, not more than one drive should
have the same number jumper ON.
Drive number
Jumper settings
SELECT-O SELECT-1 SELECT-2 SELECT-3
0 ON OFF
OFF
OFF
1 OFF ON
OFF
OFF
2
OFF OFF
ON
OFF
3
OFF OFF OFF
ON
DRaIWAIT
Set to ON (ORO) urness otherwise instructed by the manual of your
application software which works with WAIT mode.
TERMINATOR
Set to ON, when you install one drive in your system.
When you install more than one internal drive in a daisy-chain, set to ON
for the last drive and to OFF for the other drives.
When you connect external drives in a daisy-chain, set to ON for the first
and last drives in the chain, to OFF for any drives in between, and
remove the terminator resistors from the host adapter. For instructions on
how to remove the resistors, refer to the users' manual of the host
adapter.
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