Seagate ST11200N Product Manual page 68

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* 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 daisychain. 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 SCSI cable pin assignments (Nonshielded connector)
Signal
-DB (0)
-DB (1)
-DB (2)
-DB (3)
-DB (4)
-DB (5)
-DB (6)
-DB (7)
-DB (P)
Ground
Ground
Ground
TERMPWR
Ground
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.
Product Manual - Hawk 1 Family SCSI-2 (Volume 1), Rev. D
SCSI Device
Host Adapter/Initiator
T
*
* * * *
Disc Drive or Disc Drive or
Other SCSI Other SCSI
Device Device
View B
T indicates termination required
Pin Number
2
4
6
8
10
12
14
16
18
20
22
24
26
28
* * *
1 thru 8
SCSI Devices
*
T
Disc Drive or
Other SCSI
Device
Signal
Ground
-ATN
Ground
-BSY
-ACK
-RST
-MSG
-SEL
-C/D
-REQ
-I/O
Pin Number
30
32
34
36
38
40
42
44
46
48
50