Seagate ST373455LC - Cheetah 73.4 GB Hard Drive Installation Manual page 44

42
LW drives
68 Pin SCSI I/O
Connector
Pin 1
J1
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
not used
Host Alternate
Usage Plug
+5V
+5V
N.C.
Ground
Dashed area is optional host circuitry (external to the
drive) connected to host supplied optional usage plug.
Figure 8. Using J5 connector for model "LW" drive
alternate ID select and LED connection
Barracuda 18LP Installation Guide, Rev. B
+5V
Ground
A 3 A 2 A 1 A 0
11 9 7 5 3 1
12 10 8 6 4 2
Drive Activity LED
J5
J1-DC Power
Pin 1
4P 3P2P
(default)
For ID selection use
jumpers as shown or
connect a cable for
remote switching as
shown below.
Pins 1, 3, 5, and 7 are
optional connections to
switching circuits in host
equipment to establish
drive ID.
A 0 A 1 A 2 A 3
Remote Switches
Pins 2, 4, 6, and 8 are normally
not grounded. They are driven low
(ground) for 250 ms after a Reset or
PWR ON to allow drive to read
SCSI ID selected. Pin 8 may
also be used to drive the cathode
of an external Activity LED.
Drive
HDA
Rear
1P
PCB