Scsi Connector-External Models - Seagate STD124000N Product Manual

Installation
SCSI Connector—External Models
Product Manual
The external drive provides two 50-pin, shielded connectors (ANSI Alternative 2) on
the rear panel of the drive. These connectors consist of two rows of ribbon contacts
spaced 2.16 mm (0.085 in) apart.
These two connectors facilitate adding the drive to a daisy-chain configuration.
Either connector is a SCSI IN connection; the other is a SCSI OUT connection.
When the drive is the last device in the chain (or the only device), an external
terminator is plugged in the SCSI OUT connector.
The pin assignments for these single-ended connectors are listed in the following
table.
Note. Pins 1 through 12 and 14 through 25 are connected to ground. Pin 13 is
open. A signal name or abbreviation preceded by a dash indicates that the
signal is active-low.
Pin Assignment
26 –DB(0)
27 –DB(1)
28 –DB(2)
29 –DB(3)
30 –DB(4)
31 –DB(5)
32 –DB(6)
33 –DB(7)
34 –DB(P)
35 GROUND
36 GROUND
37 GROUND
38 TERMINATOR POWER
39 GROUND
40 GROUND
41 –ATN
42 GROUND
43 –BSY
44 –ACK
45 RST
–
46 –MSG
47 –SEL
48 –C/D
49 –REQ
50 –I/O
Chapter 3
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