Installation guide

18 Hawk 2LP (Wide) Installation Guide, Rev. A
SCSI address selection
On "W" and "WD" model drives, make sure that the
SCSI bus address jumper(s) are properly set for the
bus address assigned to the drive. See Figures 3a and
3b showing the bus address select header and the
jumper configurations that select addresses 0 through
15. ID7 has the highest priority during bus arbitration
(on both 8 and 16 device systems). Bus arbitration
priority decreases to ID0, then ID15 down to ID8. ID8 is
the very lowest priority. Typically the primary boot
device is set to ID 0, the host is ID7 and the subsequent
SCSI drives are jumpered as appropriate for the par-
ticular system involved.
If the drive "Busy" LED shows no on/off activity when
the host is trying to communicate with it, an incorrect
bus address selection at the drive should be suspect-
ed.
On "WC" and "DC" model drives the SCSI ID can be
and presumably will be, set over the 80 pin interface by
the host computer. Unless directed to do so by the
system documentation, no jumpers should be installed
for address selection. On "WC" and "DC" model drives,
the host system also has complete control over motor
start functions, so no Motor Start or Delayed Motor
Start Jumpers should be installed.