Seagate ST12450W, Product Manual

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ST12450W/WD Product Manual, Rev. A 41
Block Pins Function
J01 1 & 2* Terminator power supplied by the drive.
2 & 4* Terminator power supplied from the SCSI bus.
1 & 3 Terminator power supplied to the SCSI bus.
1 & 3 and Terminator power supplied to the SCSI bus and
2 & 4* drive.
J4 1 & 2 Write Protect option. Jumper installed protects the entire
disc drive. Default is no jumper.
3 & 4 Delay Motor Start option. Jumper installed waits for ten
(10) seconds for each target ID number before starting
the spindle motor automatically. Default is no jumper.
Example:
If target ID is equal to three (3)
3 x 10 = 30
Target spindle motor starts
in thirty (30) seconds.
5 & 6 Enable Motor Start option. Jumper installed causes the
target to wait for the Start Unit command from the SCSI
host. No jumper installed causes the unit to look at the
Delay Motor Start jumper. Default is no jumper.
7 & 8 Parity Disable option. Jumper installed causes parity
checking and error reporting to be disabled. Default is no
jumper.
9 & 10 Reserved. Default is no jumper.
11 & 12* Enable Single-Ended Drive Terminator. Jumper installed
enables the drive terminator. Jumper removed disables
the drive terminator. Default is no jumper.
13 & 14 Reserved. Default is no jumper.
15 & 16 Reserved. Default is no jumper.
J5 1 & 2** SCSI Target ID 0
3 & 4** SCSI Target ID 1
5 & 6** SCSI Target ID 2
7 & 8** SCSI Target ID 3
9 & 10 Remote LED connector. Pin 9 is cathode (neg), Pin 10 is
anode (pos). Pin 10 is current limited through a 1K ohm,
1/10W resistor.
11 & 12 Spindle sync cable connector. Pin 11 is the SSREF+ or
reference index signal. Pin 12 is Gnd.
* Valid for single-ended (ST12450W) drives only.
** See Figure 14 to set the SCSI ID.