Hawk 1LP Family Installation Guide, Rev. D | 19 |
order. Bus addresses 0 through 6 should be used (the host adapter usually uses address 7). If the drive LED shows no on/off activity when the host is trying to communicate with it, an incorrect bus address selec- tion at the drive should be suspected.
On "NC" 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 "NC" 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
Model "N" drives and some model "NC" drives have terminator resistor packs that are permanently installed, but can be enabled or disabled by jumper plug. See jumper in Figure 3a and 3c. If you are installing a single drive, the terminator resistor packs must remain en- abled. 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.