Specifications
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SP-3 SCSI Interface Manual
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SCSI System Set-Ups and Termination Requirements
There are two general types of system configurations. The first consists of an ASR-10 with one or
more SCSI Storage Devices connected. Figures 1 to 3 show the termination requirements for
several configurations of this type.
Figure 1
ASR-10, 1 SCSI Storage Device
Both units must be terminated.
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_--
_-
I ASH-10
Figure 2
ASR-10, 2 SCSI Stora
e Devices
The ASR-10 and SCSI
5
torage Device 2 must be
terminated. SCSI Storage Device 1 must not have a
terminator.
Figure 3
ASR-IO,3
or More SCSI Stora e Devices
The ASR-10 and SCSI Storage
%
evice 3 must be
terminated. SCSI Storage Devices 1 and 2 must
not
have termination.
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I
1
ASR-10
The second type of configuration consists of an ASR-10 with SCSI Storage Device(s) and a SCSI-
equipped computer such as a Macintosh. Figures
4,5
and 6 illustrate several such set-ups. The
following are a few notes on using the ASR-10 with a computer on the SCSI bus:
l Position the ASR-10 and the computer at opposite ends of the SCSI chain.
.
Any SCSI Storage Devices should be located in the center of the chain.
l Terminators must be present on the ASR-10 and on the computer only.
l All terminators in or on the SCSI Storage Device(s) musf be removed.
Note:
If your Macintosh has an internal SCSI Storage Device, it also has internal termination.
Figure 4
Macintosh Computer with internal
hard disk, ASR-10, and 1
ASR-10
._
, . . . . . . . . . . . . . . . . . . . .
/i
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:
SCSI Storage Device
The SCSI
Storage Device must not
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I I
SCSI storage
Device
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F
have a terminator. The Macintosh
and \.....................:
ASR-10 are terminated intemallv.
Figure 5
Macintosh Computer with no internal
hard disk, ASR-10, 2 or More SCSI
Storaee Devices
SCSI storage Devices 1,2, and 3 must
not have terminators. The Macintosh*
and ASR-10 must have termination.
J
+
Some computers may not provide internal termination. For these system configurations, simply
terminate the SCSI Storage Device that is closest to the computer and use us short a cable as possible
befzjeen
that device and the computer.
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ENSONIQ A.9710 Version 3 Operating System