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Jumper settings for the ACB-4525S4000
-------
P
o
0
0
Diagnostics
N
o
0
M
Parity Enable
L
0
0
K
Disable Unit Attention
J
o
0
I
Start Spindle
H
o
0
G
Adaptec 5500/4000 Compatibility
F
o
0
E
SCSI Address 2t' 2
D
0
0
C
SCSI Address
2~1
B
o
0
A
SCSI Address
2°0
-------
J5
3.4.1
DIAGNOSTIC MODE
The installation of the O-P jumper will cause the ACB-4525Z to
continuously repeat a diagnostic self-test. See Appendix B for
details of this self-test.
3.4.2
PARITY ENABLE
The installation of the M-N jumper will cause the ACB-4525Z to
check for bus out (data into the ACB-4525Z) parity errors. This
jumper should only be installed if all SCSI devices communicating
with the ACB-4525Z generate SCSI data parity. The ACB-4525Z will
always generate parity on bus in data transfers.
3.4.3
DISABLE UNIT ATTENTION
Normally the ACB-4525Z will support SCSI Unit Attention.
To
allow normal operation with some hosts that do not support Unit
Attention, the installation of the L K jumper
will disable Unit
Attention on the CCS mode.
Unit Attention is also not supported
if the H G jumper is installed on the ACB-4525S4000.
3.4.4
START SPINDLE
Normally, the ACB-4525Z will issue a START SPINDLE command at
power up. However,
with jumper I-J installed the initiator must
issue a START SPINDLE command before the drive will spin up. This
feature allows the initiator to control the power sequencing (and
peak surge current) of the attached drives.
3.4.5
ENABLE ZERO LATENCY (ACB-4525Z ONLY)
with jumper installed, the ACB-4525Z will default to zero latency
option set upon power up or SCSI reset.
This option is reset via
mode select (page 6-42 ), or responding to Mify Data Pointer
message with "Message Reject."
See 4.2.2.2.
3-4
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