Product manual

Barracuda 9 Product Manual, Rev. C 59
[1] Closed-end type 50-pin connector used. Install terminator enable (TE) jumper plug.
[2] Open-end type (in-line application) connector used. Terminators disabled.
[3] 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.
[4] Total interface cable length must not exceed that specified in Section 9.6.3.1 (including host adapter/initia-
tor). The number of devices allowed depends on data transfer rate. See Table 12.
[5] SCSI ID7 has highest arbitration priority, ID 0 has lowest for “N” models. For “W” models, priority is ID 7 to
ID 0, then ID 15 to ID 8 (ID 8 very lowest).
[6] Last drive on daisy chain.
[7] Open-end type 68-pin connector used. Terminators disabled on “WD” models. If end “WD” device, exter-
nal terminator and closed-end type 68-pin connector used. On “W” models, install terminator enable (TE)
jumper plug. “N” and “W” models do not require external terminators.
Figure 16. SCSI daisy-chain interface cabling
Host Adapter
PCB
Pin 1
(check your
adapter for Pin 1 location)
[6] [6] [6]
“N” Model
Drive
SCSI ID 1
SCSI ID 0
SCSI ID 7 [5]
[7]
2 through X SCSI devices [4]
[1]
[1]
[3]
[2]
[2]
“W” Model
Drive
[7]
“WD” Model
Drive
Note:
Do not mix 
“W” and “WD” 
model drives 
on the daisy 
chain.
Terminator