Seagate ST31200N, Руководство по эксплуатации продукта

Страница: 63 / 78

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 1LP Family SCSI-2 (Volume 1), Rev. A 55
________________________________________________________________________________________
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 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 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.