Data General AViiON Series, Клиентская документация

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Connecting External Devices to VME Option Boards
4-25
014–001867
Connecting SCSI Devices to a VSA SCSI-2
Controller
This section describes how to connect the cables from a VSA board to your SCSI
peripherals. The VSA board has two SCSI ports, each of which can connect to a
SCSI peripheral. You can configure each port independently for either single-ended
or differential SCSI operation by changing the orientation of the port’s small
daughter board on the VSA board. See Chapter 2 in this manual, or refer to the
manual Installing, Configuring, and Programming the Model 7430 VME SCSI-2
Adapter (VSA) in AViiON

Systems for information on orienting a VSA controller’s
daughter boards for single-ended or differential operation.
The SCSI cables you use to connect peripheral devices are specific to the VSA board;
they have a 50-pin high-density connector that plugs into a SCSI connector on the
VSA board, and a 50-pin connector that connects to your peripheral device at the
other end.
The SCSI cable is available in several lengths. Table 4–8 lists the cable model
(ordering) numbers, part numbers, and lengths for use with AViiON systems. Check
the 005 part number on the label of each of your cables to be sure you have the right
cables.
NOTE: For single-ended operation, you must use a 1.5–m (5-ft) or 3–m (10-ft)
cable. You can use any of the listed cables for differential operation.
Table 4–8 SCSI Device Cables
Model Number Part Number Length (m)
15396E005 005–039718 1.5 (5 ft)
15396E010 005–039719 3 (10 ft)
15396E020 005–039720 6 (20 ft)
15396E040 005–039721 12 (40 ft)
To attach the cable, press the 50-pin high-density connector end onto the
appropriate SCSI connector on the VSA board (see Figure 4–29), and turn the
thumbscrews clockwise to tighten.
CAUTION: Do not connect a differential device to a VSA daughter board oriented
for single-ended operation, or vice versa.