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

5
If you are using both internal SCSI connectors, connect the
other 8-bit or 16-bit internal devices, as needed. You must use a
converter if you are connecting 8-bit SCSI devices to a Wide
SCSI 68-pin cable.

Connecting External SCSI Devices

You can daisy chain up to seven external SCSI devices to Channel A
of the AHA-3940 and up to fifteen external SCSI devices to Channel
A of the AHA-3940W. Daisy-chaining means that multiple devices
can be connected using more than one cable. For example, a cable
runs from the external SCSI connector to the first external device. A
second connector on the back of the external device allows another
cable to connect it 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 2-7. External cable connectors can only be
plugged in one way; therefore, pin-1 orientation is automatic.
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 2-8.
Figure 2-8. External Cable to Host Adapter
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AHA-3940/3940W User's Guide
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Installing Your Host Adapter and SCSI Devices
External SCSI Connector
External SCSI Cable
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