order. Bus addresses 0 through 14 should be used (the
host adapter usually uses address 15). 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 suspected.
On "WC" model drives the SCSI ID can be and presum-
ably 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" 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.
Terminator resistor packs
As a factory installed option, Hawk 1LP family model
"W" drives can have terminator resistor packs that are
permanently installed, but can be enabled or disabled
by jumper plug. See jumper in Figure 3a. If you are
installing a single drive, the terminator resistor packs
must remain enabled. If you are installing multiple hard
disc drives, disable the termination resistor packs from
all the drives but the one connected to the end of the
SCSI I/O cable.
18 Hawk 1LP (Wide) Installation Guide, Rev. B
