Connecting External Scsi Devices; External Cable To Host Adapter - Adaptec AHA-3940U User Manual

Connecting External SCSI Devices

You can daisy-chain up to seven external SCSI devices to Channel A
of the AHA-3940U. You can daisy-chain up to fifteen external SCSI
devices to Channel A of the AHA-3940UW or Channels A and B of
the AHA-3940UWD. Daisy-chaining means connecting multiple
devices with multiple cables. For example, a cable runs from the
external SCSI connector to the first external device; a second connec-
tor on the back of the external device allows another cable to connect
with the second device in the chain, and so forth.
The external SCSI cables must meet the specifications listed in Choos-
ing SCSI Cables on page 2-5. External cable connectors can only be
plugged in one way, so pin-1 orientation is automatic. You can buy
appropriate cables and other accessories from Adaptec; call
(800) 442-SCSI.
Follow these steps to connect external SCSI devices:
1
Attach one connector of the external SCSI cable to the external
SCSI connector, as shown in Figure 2-9.
Figure 2-9. External Cable to Host Adapter
2
Attach the connector at the other end of the external cable to
either one of the SCSI connectors on the external SCSI device,
AHA-3940U/3940UW/3940UWD User's Guide
Stock Number: 511041-00, Rev. B
Print Spec Number: 494569-00
Current Date: 2/14/97
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Installing the Host Adapter and SCSI Devices
External SCSI Connector
(AHA-3940UWD has two
connectors)
External SCSI Cable
Page: 2-9
ECN Date: 2/17/97
2-9