2.4 Machine Sp ecic Instructions 17
Cho osing a SCSI ID
Before connecting the
DAT-Link
,you need to check which SCSI ID's are already in
use on your system. To do this, you need to rst shutdown the computer by logging
in as ro ot and running:
shutdown -h now
Once you receivea\
>
" prompt, make sure all the SCSI devices connected to the
machine are turned on, and type:
show device
This will display a listing of each SCSI device connected to the machine. It will
also indicate the SCSI target ID of each device including the
DAT-Link
, if it is
connected. Examine the display and note which devices are in use. Any ID's
between 0 and 6 which do not show a connected device can b e used for the
DAT-
Link
. Note that although the
DAT-Link
's ID switch go es up to 9, settings 8 and
9 are reserved for factory testing. ID 7 is reserved by the host computer. For
the following instructions, we will assume that the device ID chosen was 4. If you
choose a dierent ID, make sure you replace \4" with the chosen ID b efore typing
any commands that follow.
Connecting the
DAT-Link
The next step is to connect the
DAT-Link
to the computer. Since it is necessary to
unterminate the SCSI bus temp orarily, it is recommended that you shut-down and
turn o the computer before making the connection.
The
Options
switches on the rear of the
DAT-Link
should b e set with all switches
down. Then connect the
DAT-Link
to the computer using the SCSI cable. If the
DAT-Link
is the last device on the SCSI bus, be sure to connect the provided SCSI
terminator between the cable and the
DAT-Link
's SCSI connector. Failure to do
so can cause problems with reb o oting the DECstation. Once you havechosen an
ID and connected the DAT-Link, rerun the
show devices
command to verify that
the computer can communicate with the
DAT-Link
.
Once it is hooked up and powered on you can rebo ot the computer. If you have
trouble rebooting, verify that the SCSI ID selected on the
DAT-Link
was not one
that was already in use. Note that during the bo ot sequence, some SCSI devices
will be listed. The
DAT-Link
may not app ear in this list. This do es not indicate a
problem.
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