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Product Manual - Hawk 2 Family SCSI-2 (Volume 1), Rev. C
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Notes for Figure 10.1-1:
[1] Notes explaining the functions of the various jumpers on jumper header connectors J2, J5 and J6 are given
below in left to right order of jumper position. The term "default" means as standard OEM units are config-
ured when shipped from factory. "Off" means no jumper is installed; "On" means a jumper is installed. "Off" or
"On" underlined is factory default condition.
[2] The PCB on "NC" models does not have connector J5, and has a single 80 pin combined SCSI I/O and DC
power connector instead of the normal 50 pin SCSI I/O and 4 pin DC power connectors. Included among the
80 pins are the SCSI ID, Motor Start and Delayed Motor Start select functions, and the synchronous spindle
master sync signal and the remote LED signals. Do not use J2 and J6 for these five functions if the host uses
the ones included in the 80 pin connector. See Table 11.6.3-1c for a list of pin numbers vs. signals for the 80
pin connector.
J2
Jumper
Installation
Jumper Function Description
RES
Off/On
Reserved. Default is no jumper installed.
DS
ME
Off
Off
Spindle starts immediately after power up - Default setting.
Off
On
Drive spindle does not start until Start Unit command 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 connected, drive 1 starts after 12 second delay, drive
2 starts after 24 second delay, etc.
On
On
Drive spindle starts when Start Unit command received from host. Delayed start feature is over-
ridden and does not apply when ME jumper is installed.
WP
On
Entire drive is write protected.
Off
Drive is not write proteccted. Default is no WP jumper installed.
PE
On
Parity checking and parity error reporting by the drive is enabled.
Off
Drive does not report result of parity checking to host. Default is no PE jumper installed.
TE
On
With the jumper installed, the On-board (non-removable) terminator circuits are enabled (con-
nected to the I/O lines). Default is jumper installed.
Off
Terminator circuits not connected to I/O lines.
TP
TP
Off
Off
No terminator power is connected to drive terminators or SCSI bus I/O pin 26.
On
Off
Drive supplies its own teminator power only. Jumper on this position is factory default for "N"
models only.
Off
On
Drive supplies power to I/O pin 26 of SCSI bus; none to internal terminators. When drives have
differential I/O circuits, a jumper on the right TP position is needed to power external terminators
(see system documentation). The ST12400ND drive has differential I/O circuits which have no
terminator circuits on the drive. The ST12400NC drive has no provisions for terminators and no
provisions for terminator power in the 80 pin I/O connector. Factory default for "ND" models
only.
On
On
Drive supplies terminator power to itself (internal connection) and to I/O pin 26 of SCSI bus. This
is a legal jumper setting.
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