Seagate ST125N Product Manual page 19

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