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36
8.1.1
Notes for Figures 8 through 10b
Notes explaining the functions of the various jumpers on jumper header connectors J01, J4A and J4B are
given here. The term "default" means as standard OEM units are configured with a jumper on those positions
when shipped from factory. "Off" means no jumper is installed; "On" means a jumper is installed. OFF or ON
underlined is factory default condition.
Function description of configuration jumpers
J4A jumpers
Jumper function description
A
[1], A
, A
, A
SCSI ID jumpers. Drive ID address on the SCSI bus from 0 to 15 established by these
3
2
1
0
jumpers as shown. Default is Drive ID = 0. ID = 7 is highest priority which is usually the
SCSI host adapter. Priorities go ID7 to ID0, then, on "W" and "WD" model drives, ID15
to ID8.
WP
(Applies to all models)
On
Entire drive is write protected.
Off
Drive is not write protected. (Default)
TE
(Applies only to "N" and "W" models)
On
On-board (non-removable) terminator circuits are enabled. (Default)
Off
On-board (non-removable) terminator circuits are disabled.
J7 remote
cable connector Function description ("WD" model only)
A
, A
, A
, A
SCSI ID jumpers. Drive ID address on the SCSI bus from 0 to 15 established by these
3
2
1
0
jumpers as shown. Default is Drive ID = 0. ID = 7 is highest priority which is usually the
SCSI host adapter. Priorities go ID7 to ID0, then ID15 to ID8.
Pins 4, 6, 8, 10, and 12 are ground.
READY LED
Pins 1, 4 (See Figure 10b.)
FAULT LED
Pins 2, 4 (See Figure 10b.)
J4B Jumpers
DS
ME
(Applies to all models)
Off
Off
Spindle starts immediately after power up. (Default)
Off
On
Spindle does not start until a Start Unit command is received from the host.
On
Off
Startup is delayed by SCSI ID times 12 seconds after power is applied. For example:
Drive with SCSI ID of 0 starts the spindle immediately when DC power is connected,
drive with SCSI ID of 1 starts after a 12-second delay, drive with SCSI ID of 2 starts
after 24-second delay, etc. Tolerance is plus 3 seconds, minus 0 seconds.
On
On
Spindle starts when the host sends a Start Unit command. Delayed start feature is over-
ridden and does not apply when the ME jumper is installed.
PD
(Applies to all models)
On
SCSI parity checking and parity error reporting by the drive is disabled.
Off
Drive checks for parity and reports the results of parity checking to host. (Default)
J01 Jumpers [2] (Applies to all models)
No jumpers on
No terminator power is connected to the drive terminators or the SCSI bus I/O cable.
2-4
Drive terminator power comes from SCSI bus.
1-3 and
Drive supplies terminator power to itself (internal connection) and to the SCSI bus I/O
2-4
cable.
1-2
This horizontally-positioned jumper connects terminator power from drive's internal
power to the drive's internal terminators only (for single-ended I/O only).
[1]
A3 used only on "W" and "WD" drives.
[2]
See Tables 12, 13, and 14 for I/O connector (J6) pins used for Termpower.
Elite 23 Product Manual, Rev. A
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