Seagate ST32430N Product Manual - Page 55

Product Manual - Hawk 2LP Family SCSI-2 Volume 1, Rev. A, Signal, Pin Number, Notes., Caution

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Product Manual - Hawk 2LP Family SCSI-2 (Volume 1), Rev. A 47 SCSI Device Host Adapter/Initiator * * * T * 1 thru 8 SCSI Devices * * Disc Drive or Other SCSI Device * * Disc Drive or Other SCSI Device * T Disc Drive or Other SCSI Device VIEW B - T indicates termination required Total interface cable length must not exceed that specified in paragraph 11.6.2.2. (including host adapter/initiator). * Closed end type connector used. ** Open end type (in-line application) connector used. *** Host need not be on the end of the daisy-chain. Another device can be on the end with the terminator, the host having no terminator. Figure 11.6.3-2. Interface cabling Table 11.6.3-1a. Single ended, 50 pin cable pin assignments (Nonshielded connector) (N models) Signal Pin Number Signal -DB (0) 2 GROUND -DB (1) 4 -ATN -DB (2) 6 GROUND -DB (3) 8 -BSY -DB (4) 10 -ACK -DB (5) 12 -RST -DB (6) 14 -MSG -DB (7) 16 -SEL -DB (P) 18 -C/D GROUND 20 -REQ GROUND 22 -I/O GROUND 24 TERMPWR 26 GROUND 28 Notes. 1. All odd pins except pin 25 are connected to ground. Pin 25 is left open. Pin Number 30 32 34 36 38 40 42 44 46 48 50 Caution Pin 25 must not be connected to ground at the HOST end or the drive end of the cable. If the I/O connector should accidentally be plugged upside down, terminator power on pin 26 will be shorted to ground. 2. The minus sign next to the signals indicates asserted state is the low voltage of the two levels used for logic signals.

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SCSI Device
Host Adapter/Initiator
T
Disc Drive or
Other SCSI
Device
Disc Drive or
Other SCSI
Device
Disc Drive or
Other SCSI
Device
1 thru 8
SCSI Devices
T
* * *
*
*
* *
* *
Product Manual - Hawk 2LP Family SCSI-2 (Volume 1), Rev. A
47
__________________________________________________________________________________________
VIEW B - T indicates termination required
Total interface cable length must not exceed that specified in paragraph
11.6.2.2. (including host adapter/initiator).
*
Closed end type connector used.
**
Open end type (in-line application) connector used.
***
Host need not be on the end of the daisy-chain. Another device can be
on the end with the terminator, the host having no terminator.
Figure 11.6.3-2. Interface cabling
Table 11.6.3-1a. Single ended, 50 pin cable pin assignments (Nonshielded connector) (N models)
Signal
Pin Number
Signal
Pin Number
-DB (0)
2
GROUND
30
-DB (1)
4
-ATN
32
-DB (2)
6
GROUND
34
-DB (3)
8
-BSY
36
-DB (4)
10
-ACK
38
-DB (5)
12
-RST
40
-DB (6)
14
-MSG
42
-DB (7)
16
-SEL
44
-DB (P)
18
-C/D
46
GROUND
20
-REQ
48
GROUND
22
-I/O
50
GROUND
24
TERMPWR
26
GROUND
28
Notes.
1.
All odd pins except pin 25 are connected to ground. Pin 25 is left open.
Caution
Pin 25 must not be connected to ground at the HOST end or the drive end of the cable. If the I/O
connector should accidentally be plugged upside down, terminator power on pin 26 will be shorted to
ground.
2.
The minus sign next to the signals indicates asserted state is the low voltage of the two levels used for logic
signals.