Seagate BARRACUDA 50 ST150176LW/LC - Manual (Page 31)

Barracuda 50 Installation Guide, Rev. A 29
Additional connector on ST150176LW drives
ST150176LW drives have a connector located between the
SCSI I/O connector and the DC power connector to allow you to
set the SCSI ID and connect LEDs from the back of the drive.
You are not required to use this connector, but it’s available if you
want to use it. Refer to Figure 11 for pin assignments.
Figure 11. Alternate SCSI ID select and LED connection
SCSI ID = 0
SCSI ID = 1
SCSI ID = 2
SCSI ID = 3
SCSI ID = 4
SCSI ID = 5
SCSI ID = 6
SCSI ID = 7
SCSI ID = 8
SCSI ID = 9
SCSI ID = 10
SCSI ID = 11
SCSI ID = 12
SCSI ID = 13
SCSI ID = 14
SCSI ID = 15
J1-DC Power
68 Pin
SCSI I/O Connector
J1
Pin 1
Pin 1
J5/J1A [2][4]
J1A Pin 1
Pin 12
1P 2P 3P 4P
SCSI Address A0
SCSI Address A1
SCSI Address A2
SCSI Address A3
No connection
+5V
Fault LED*
Vendor Unique*
Reserved
Activity LED*
Ground
These pins are driven low for
250 ms after PWR ON or
RESET to allow jumper
selectable SCSI ID as shown
to the right. *