Seagate ST3285N, Product Manual

Page: 28 / 151

2.4.1 SCSI connector pin assignments
In the table below, a minus sign indicates active low.
Signal name
Signal
pin number Ground
pin number
DB(0)– 2 1
DB(1)– 4 3
DB(2)– 6 5
DB(3)– 8 7
DB(4)– 10 9
DB(5)– 12 11
DB(6)– 14 13
DB(7)– 16 15
DB(P)– 18 17
Ground 19–22 —
Reserved 23–25 —
Terminator power 26 —
Reserved 27–28 —
Ground 29–30 —
ATN– 32 31
Ground 33–34 —
BSY– 36 35
ACK– 38 37
RST– 40 39
MSG– 42 41
SEL– 44 43
C/D– 46 45
REQ– 48 47
I/O– 50 49
Caution. Do not connect pin 25 to ground. If you plug in the connector
upside down, the terminator power on pin 26 is shorted to
ground. This can damage the drive.
18 ST3655 Family SCSI Drives Product Manual, Rev. A