Seagate ST31200N, Руководство по эксплуатации продукта

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34 Product Manual - Hawk 1LP Family SCSI-2 (Volume 1), Rev. A
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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
configured 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.
[3] "ND" models do not have terminators on the drive PCB, so these jumpers are not applicable to these drives.
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
overridden and does not apply when ME jumper is installed.
WP
On
Entire drive is write protected.
Off Drive is not write protected. Default is no WP jumper installed.
PE
On
Parity checking and parity error reporting by the drive is enabled. Default is PE jumper
installed.
Off Drive does not report result of parity checking to host.
TE
On
With the jumper installed, the On-board (non-removable) terminator circuits are enabled
(connected 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. On "NC" model drives, this jumper may be
required if terminator Module U5 is installed. See Figure 10.1-2. Jumper on this position is
factory default for "N" model drives.
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 may be needed to power external
terminators (see system documentation). The ST31200ND drive has differential I/O circuits
which have no terminator circuits on the drive. The model ST31200NC and ST3620NC may
have terminators (U5) on the drive, but has no provisions for terminator power in the 80 pin
I/O connector.
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, but would only be used for "N" model drives.