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7.4
Connecting Other SCSI Devices
7.4.1
Notes
The cable supplied with the product has 3 UW SCSI connections. The cable
end is plugged into the integrated SCSI drive.
The controller and the cable are terminated. If you want to connect up other
devices, observe the general information in Section 7.1.2.
You can connect up another two SCSI devices internally. Possible
expansions:
Number:
Internal
1
2
3
1
2
3
1)
2)
The customer is responsible for determining the extent to which the
connection of external SCSI devices is compatible with the device. Devices
with FCC, UL and CE labeling should be connected.
7.4.2
Terminating the AHA-2940 Ultra Wide
Termination on the AHA-2940Ultra Wide itself is controlled by software
comands via the SCSISelect utility. The default setting is set to Automatic.
When set to Automatic, if the AHA-2940Ultra Wide detects that SCSI cables
are connected to any of its three SCSI connectors, it automatically sets the
termination setting for the low and high bytes of the 16-bit Wide SCSI bus.
The low byte controls 8-bit SCSI; the low and high bytes together control
16-bit Wide SCSI.
We recommended that you leave the AHA-2940Ultra Wide set to its default
setting of Automatic. If you want to manually set the AHA-2940Ultra Wide
termination setting, see the chapters and this description. The following table
lists the termination configurations. Figures 7-2 and 7-3 show termination
examples for the AHA-2940Ultra Wide.
Device Connected to AHA-2940Ultra Wide
68-pin internal connector only
68-pin external connector only
68-pin internal and 68-pin external connectors
50-pin internal connector only
50-pin and 68-pin internal connectors
50-pin internal and 68-pin external connectors
RI 45 PIII, Manual
C79000-G7076-C817-01
Type
ID-
Range
UW
0-15
UW
0-15
UW
0-15
UW
0-15
UW
0-15
UW
0-15
UW means 16-bit SCSI, W means 8-bit SCSI
ID 7 is intended for the SCSI controller
1)
Number:
Type
2)
External
14
UW
13
UW
12
UW
7
W
7
W
7
W
Low
ON
ON
OFF
ON
OFF
OFF
SCSI Option
ID-
2)
Range
0-15
0-15
0-15
0-6
0-6
0-6
High
ON
ON
OFF
ON
ON
ON
7-13
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