For
HP
Internal Use Only
Table
4-18. J2 Jumper Function Description
Jmnper
Jumper
F'unction
Description
TP
TP
Off
Off
No
terminator
power is connected
to
drive terminators or SCSI bus
I/0
pin 26.
On Off
Drive supplies its own terminator power only.
Off On
Drive supplies power
to
I/0
pin
26
of
SCSI bus, none
to
internal terminators.
On On
Drive supplies
terminator
power
to
itself (internal connection)
and
to
I/0
pin
26
of
SCSI bus.
TP
POSITION
A
On
This
horizontally positioned
jumper
across
the
two TP positions nearest
the
PCB
edge connects
terminator
power from SCSI bus
I/0
pin
26
to
the drive's internal
terminators. (For single-ended only.)
Set
if
it is the last device on the bus.
RES
Off
Reserved.
PE
On
Parity
checking
and
parity
error reporting by
the
drive
is
enabled.
Off
Drive does
not
report result
of
parity checking
to
host.
WP
On
Entire drive
is
write protected.
Off
Drive
is
not write protected.
DS
ME
Off
Off
Spindle
starts
immediately after power up.
Off On
Drive spindle does
not
start
until
Start
unit
command
is
received from host.
On Off
Spindle
Startup
is delayed by SCSI ID times
12
seconds after power
is
applied, i.e.
drive
0 spindle
starts
immediately when DC power
is
connected, drive 1
starts
after
12-second delay, drive 2 after 24-second delay, etc.
On
On
Drive spindle
starts
when
Start
Unit command is received from
the
host. Delayed
start
feature
is
overridden and does not apply when
the
ME
jumper
is
installed.
RES
Off
Reserved
4-36 Configuration