Seagate ST136403LW/LC manual Additional connector on LW model drives

Cheetah 36 Installation Guide, Rev. A 29

Additional connector on LW model drives

LW model 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.

68 Pin
SCSI I/O Connector
J1	Pin 1	J5/J1A [2][4]	Pin 1

Pin 12

J1A Pin 1

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.

4P 3P 2P 1P

J1-DC Power

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

Figure 11. Alternate SCSI ID select and LED connection