Adaptec 1520A User Guide - Page 43

Connecting External SCSI Devices

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Hardware Installation 5 To connect other internal SCSI devices, plug the devices into the other connectors on the ribbon cable, as shown in Figure 3-7. Pin 1 Colored stripe Internal SCSI device Figure 3-7. Internal SCSI Ribbon Cable to Internal SCSI Device Connecting External SCSI Devices You can daisy chain up to seven external SCSI devices to the external connector on the host adapter. Daisy chaining means connecting multiple devices in a series, as shown in Figure 3-8. A cable runs from the external host adapter connector to the first external device; a second cable connects the first external device with the second external device; and so on. Host adapter Terminators installed External device No termination External device No termination External device Termination enabled Figure 3-8. Daisy Chaining External SCSI Devices 3-9 AAAAAAAAAAAAAAAAAASPCAAAAAArtuHoiAAArncAAAArtkAAAe-SAAAn1NAAApt5AAAeuD1AAAcmAAA0aAAANtAbeAAAeu:/AAAr2mAAA1:0AAA15bAAAA/1eAAA1rAAA0S8:AAA4/e4AAA90rAAA94i0eAAA1-AAAs08AAAU04AAA,2AAAsR-AAAe0AAAre0'AAAvsAAA.AAAGCAAAuAAAAAAidAAAeAAAAAAAAAEAAACAAAAAANAAAAAADAAAAAAaAAAtAAAeAAA:PAAA1aAAA1AAAg/AAAe2AAA:9AAA3/AAA9-AAA49AAAAAAAAAAAAAAAAAAAA

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3-9
Hardware Installation
AHA-1510A/20A Series User’s Guide
Stock Number: 510400-00, Rev. C
Page: 3-9
Print Spec Number: 491842-00
Current Date: 11/18/94
ECN Date: 11/29/94
5
To connect other internal SCSI devices, plug the devices into the
other connectors on the ribbon cable, as shown in Figure 3-7.
Connecting External SCSI Devices
You can daisy chain up to seven external SCSI devices to the external
connector on the host adapter.
Daisy chaining
means connecting mul-
tiple devices in a series, as shown in Figure 3-8. A cable runs from
the external host adapter connector to the first external device; a sec-
ond cable connects the first external device with the second external
device; and so on.
Pin 1
Internal SCSI
device
Colored stripe
Figure 3-7. Internal SCSI Ribbon Cable to Internal SCSI Device
External device
No termination
Host adapter
Terminators
installed
External device
No termination
External device
Termination enabled
Figure 3-8. Daisy Chaining External SCSI Devices