Seagate Hawk 2 ST11900N, Руководство по эксплуатации продукта

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Product Manual - Hawk 2 Family SCSI-2 (Volume 1), Rev. B 57
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View B (T indicates termination required)
Total interface cable length must not exceed that specified in paragraph 11.6.2. (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 can be somewhere other than the end, 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 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.
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
* * *
*
* * * * *