Adaptec 1863700 User Reference - Page 8

Adaptec SCSI Card 29160LP User's Reference computer and one or more SCSI devices. SCSI cables are used to connect the devices to the SCSI adapter card. For the SCSI bus to function properly, a unique SCSI ID must be assigned to the SCSI card and each SCSI device connected to it, and the SCSI bus must be properly terminated. SCSI IDs Each device attached to the Adaptec SCSI Card 29160LP, as well as the Adaptec SCSI Card 29160LP itself, must be assigned a unique SCSI ID number from 0 to 15. A SCSI ID uniquely identifies each SCSI device on the SCSI bus and determines priority when two or more devices are trying to use the SCSI bus at the same time. Refer to the device's documentation to set the SCSI ID. Here are some general guidelines for SCSI IDs: I For internal SCSI devices, the SCSI ID usually is set by configuring a jumper on the device. I For external SCSI devices, the SCSI ID usually is set with a switch on the back of the device. I SCSI ID numbers don't have to be sequential, as long as the Adaptec SCSI Card 29160LP and each device has a different number. For example, you can have an internal SCSI device with ID 0, and an external SCSI device with ID 6. I SCSI ID 7 has the highest priority on the SCSI bus. The priority of the remaining IDs, in descending order, is 6 to 0, 15 to 8. I The Adaptec SCSI Card 29160LP is preset to SCSI ID 7 and should not be changed. This gives it the highest priority on the SCSI bus. I Most internal SCSI hard disk drives come from the factory preset to SCSI ID 0. I If you have 8-bit (or Narrow) SCSI devices, they must use SCSI IDs 0, 1, 2, 3, 4, 5, or 6. SCSI ID 0 is recommended for the first SCSI hard disk drive. 2