Termination
YOUR TASK:
Find the location of the SCSI termination jumper or
switch.
YOUR OBJECTIVE:
Determine if you must disable the SCSI termination.
YOUR METHOD:
Your drive was shipped with termination enabled.
If necessary, remove termination jumper or turn off
SCSI termination DIP switch by following
instructions below.
You must enable SCSI termination if the PX-63CS or PX-65CS is the only SCSI
peripheral used with your computer. In addition you must enable termination if you
are using multiple SCSI peripherals with your computer, and the PX-63CS or PX-65CS
is positioned as the
last
peripheral in a daisy chain.
If you have internal SCSI peripherals only, or external SCSI peripherals only (but not
both), then you should be using an internal ribbon cable or daisy chained external
cables, respectively (but not both). In this case, all devices between the host adapter
and the last peripheral on the opposite end of the ribbon cable, or the last peripheral
at the end of your daisy chain, should have their termination removed, disabled or
turned off.
If you have both internal and external SCSI peripherals (both the internal and external
connectors of your host adapter are used), then the termination of your SCSI host
adapter should be removed or disabled. The last peripheral on your internal cable
and the last peripheral on your external daisy chain should retain their termination.
All other SCSI peripherals connected to the host adapter should have their termination
removed, disabled or turned off.
NOTE:
Some host adapters and peripherals have the ability to disable and enable
termination
power
. This should not be confused with termination itself.
Termination
power
can and should be provided by at least one device
attached to your SCSI host adapter. Your Plextor CD-ROM drive auto-
matically supplies termination power. Any additional devices supplying
termination power will NOT cause any problems.
Remember: Only the
last
SCSI peripheral in a daisy chain should have termination
enabled. If you have any SCSI devices chained
after
your PX-63CS or
PX-65CS, you must disable or turn OFF the PX-63CS’s or PX-65CS’s
termination using the following instructions:
---- CHAPTER 7 ----
18
PX-63CS/PX-65CS OPERATION MANUAL
