Townshend Computer Tools DAT-Link - Page 23

2.4 Machine Sp ecic Instructions 19
Cables Required
To connect the HP computer with the DAT-Link you will require a cable with a
high-density 50 pin D connector on one end and a 50 pin Centronics typeconnector
on the other end. This may also be called a SCSI-1 to SCSI-2 cable. It should b e
available from your HP hardware supplier or can b e ordered from your DAT-Link
supplier. Make sure to connect to the HP's external, single-ended SCSI bus. The
DAT-Link will not work with a dierential or fast/wide SCSI bus.
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. SCSI ID's range from 0 to 7. The HP computer uses ID
7. Disk drives, tape drives and other peripherals connected to your computer will
use additional SCSI ID's. You will need to check which ID's are in use, and nd an
unused one to assign to the DAT-Link . Once an ID has been chosen, set the SCSI
ID switch on the rear of the DAT-Link . Note that although the switchgoesupto
9, settings 8 and 9 should not b e used as these do not corresp ond to a valid SCSI
ID.
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 be set with switches 1, 3,
and 4 down and switch 2 up. Next, follow the instructions in Section 2.3 to connect
the DAT-Link . Once it is hooked up you can reboot the computer. If you have
trouble rebooting, verify that the SCSI ID selected on the DAT-Link was not one
that was in use.
Conguring the Device Drivers
First, you should verify that system can prop erly see the DAT-Link. The ioscan
can be used for this and should contain some output similar to:
10/16 bc Bus Converter
10/16/16 ext_bus HP 28655A - SCSI Interface
10/16/16.5 target
10/16/16.5.0 tape HP HP35450A -A
Note that above is the output for a DAT-Link at SCSI ID 5 connected to single-
ended SCSI adapter card at slot 10/16/16 in a K400 machine. Dierent machine