Setting the Device Termination
Some devices have built-in termination that are controlled by a DIP switch, jumper, or
push button. Other devices use terminators on a cable or on a connector where a
terminator is plugged. To determine if a device has built-in termination, refer to its
documentation.
The following example shows the default configuration for jumper block J7 on the
SCSI adapter. The adapter was shipped with the jumpers in this configuration. This
configuration is for a single adapter on a SCSI chain. It allows the adapter to sense
whether it is at the end of a SCSI chain or in the middle of a SCSI chain. The
adapter then enables or disables its built-in SCSI terminators as required.
Typical installations use only one adapter and some number of internal or external
SCSI devices. In these cases the jumpers are left in the factory-set default position.
Default Position of Jumper Block J7
For Automatic Termination selection
Jumper J7 settings
------------------
s4
s3
s2
s1
out out out out
If the adapter is on one end of the SCSI chain, you must provide a SCSI terminator
at the other end of the chain after the last device. If the adapter is in the middle of
the SCSI chain, you must provide a terminator at each end of the SCSI chain.
Appendix C. Jumper Settings and Multi-Adapter Configurations
C-3
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