Seagate ST157N - 2.2.1 SCSI Bus Address

Figure 5: Host/Drive Interface Connectors
14
RESISTOR
TERMINATION
PACKS
PIN I
J3
DC POWER
PIN I
JI
50-PIN SCSI
C{Nl£CTOR
PIN l
J3
DC POWER ANO
PIN CONNECTOR ASSIGNMENTS
PIN
POllER
I +12 voe
2
+ l 2 VOL TS RETURN
3
+5 VOL TS RETURN
4
+5
voe
p
4 2
I
00000
SCSI ID = 0
00000
ooooigi
00000
SCSI ID = I
o o oigio
00000
SCSI ID = 2
000~
00000
SCSI ID = 3
o oigio o
00000
SCSI ID = 4
o oigioigi
SCSI ID = 5
00000
2
4
6 8 10
~0000
00~0
SCSI ID = 6
0000
00000
3
5
7 9
00~
SCSI ID = 7
P N/C 4
00000
J2 SCSI ID JUMPERS
SELECT THE DESIRED SCSI ID WITH JUMPERS.
INSTALLING A JUMPER ON PINS I AND 2 ENABLES PARITY.
N/C = NO CONNECT ION
ST125N/138N/157N Product Manual, Rev. C