Scsi Connector-Internal Models - Seagate STD124000N Product Manual

Chapter 3
SCSI Connector—Internal Models
Page 18
The internal drive provides a 50-pin, right-angle, dual-row connector on the main
PCB at the rear of the drive. The pin assignments for this single-ended connector
are listed in the following table.
Note. All odd pins, except pin 25, are connected to signal ground at the drive. Pin
25 is left open. A signal name or abbreviation preceded by a dash indicates
that the signal is active-low.
Pin Assignment
2 –DB(0)
4 –DB(1)
6 –DB(2)
8 –DB(3)
10 –DB(4)
12 –DB(5)
14 –DB(6)
16 –DB(7)
18 –DB(P)
20 GROUND
22 GROUND
24 GROUND
26 TERMINATOR POWER
28 GROUND
30 GROUND
32 –ATN
34 GROUND
36 –BSY
38 –ACK
40 RST
–
42 –MSG
44 –SEL
46 –C/D
48 –REQ
50 –I/O
1. The +5V drive supply is available on the SCSI connector as a terminator power
option. This pin is connected to the +5V through a diode. The option is selected
by a jumper at the rear of internal drives. Terminator power disabled is the
factory default.
2. ANSI defines –RST as a bidirectional pin. On the drive, –RST is input only.
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2
Installation
DAT Drives