Product manual

36 Barracuda 9 Product Manual, Rev. C
Figure 9. ST19171N option select jumper connectors
SCSI ID = 0 (default)
Jumper Plug
(enlarged to
show detail)
J6 [4]
Drive
Front
SCSI ID = 1
SCSI ID = 2
SCSI ID = 3
SCSI ID = 4
SCSI ID = 5
SCSI ID = 6
SCSI ID = 7
Pin 1
Pin 1
Reserved
Reserved
+5V (anode) [6]
–Active (cathode)
Activity LED
Reserved
The shaded pins are shipped 
with a cover installed. Do not 
install jumpers on these pins. 
Retain the cover unless you 
install a 20-pin plug.
Delay Motor Start
Enable Motor Start
Write Protect
Disable SCSI Parity
Term. Power from Drive (default)
Term. Power to SCSI Bus
Term. Power from SCSI Bus (position A)

T
E

D
S

M
E

W
P

P
D
R
E
S
T
P
2
T
P
1
Enable Terminator (default)
J2
SCSI I/O
Connector
DC Power
Connector
J2
Pin 1
Drive
Front
J6
J1
Pin 1
Pin 2
Reserved [3]
[3]
Term. Power to SCSI Bus and Drive
J2 Jumper
(enlarged to 
show detail)