4
■
If the AHA-2940Ultra detects that a cable is con-
nected to both its internal and external SCSI con-
nector, then it disables its terminators (the
AHA-2940Ultra lies between the ends of the SCSI
bus).
We recommend that you leave the AHA-2940Ultra
set to its default setting of Automatic. If you want to
manually enable or disable the AHA-2940Ultra ter-
mination setting, see Configuring the Host Adapter on
page 7.
Terminating the AHA-2940
Ultra
Wide
Termination on the AHA-2940Ultra Wide itself is
controlled by software commands via the SCSISelect
utility. The default setting is set to Automatic.
We recommend that you leave the AHA-2940Ultra
Wide set to its default setting of Automatic. If you
want to manually set the AHA-2940Ultra Wide ter-
mination setting, see Configuring the Host Adapter on
page 7. The following table lists the termination set-
tings for manual configuration.
Terminating SCSI Devices
Read the device’s documentation to determine how
to enable or disable termination on your particular
SCSI device(s). On most internal SCSI devices the ter-
mination setting is controlled by a jumper or a
switch. On other internal SCSI devices you must
physically remove or install resistor module(s). On
most external SCSI devices, a terminating plug (a
resistor pack embedded in a small plug) is installed
or removed to control termination.
AHA-2940
Ultra
Wide Termination
Devices Connected to AHA-2940
Ultra Wide
Low
High
68-pin internal connector only
ON
ON
68-pin external connector only
ON
ON
68-pin internal and 68-pin external connectors
OFF
OFF
50-pin internal connector only
ON
ON
50-pin and 68-pin internal connectors
OFF
ON
50-pin internal and 68-pin external connectors
OFF
ON
