Adaptec 19160 - SCSI Card Storage Controller U160 160 MBps Reference

2Adaptec SCSI Card 19160 User’s ReferenceUnderstanding SCSISCSI (pronounced “scuzzy”) stands for Small Computer SystemsInterface. SCSI is an industry standard computer interface forconnecting SCSI devices (such as a hard disk drive, CD-ROM drive,or scanner) to a common SCSI bus.A SCSI bus is an electrical pathway that consists of a SCSI adaptercard (such as the Adaptec SCSI Card 19160) installed in a computerand one or more SCSI devices. SCSI cables are used to connect thedevices to the SCSI adapter card.For the SCSI bus to function properly, a unique SCSI ID must beassigned to the SCSI card and each SCSI device connected to it, andthe SCSI bus must be properly terminated.SCSI IDsEach device attached to the Adaptec SCSI Card 19160, as well as theAdaptec SCSI Card 19160 itself, must be assigned a unique SCSI IDnumber from 0 to 15. A SCSI ID uniquely identifies each SCSI deviceon the SCSI bus and determines priority when two or more devicesare trying to use the SCSI bus at the same time.Refer to the device’s documentation to set the SCSI ID. Here aresome general guidelines for SCSI IDs:n For internal SCSI devices, the SCSI ID usually is set by config-uring a jumper on the device.n For external SCSI devices, the SCSI ID usually is set with aswitch on the back of the device.n SCSI ID numbers don’t have to be sequential, as long as theAdaptec SCSI Card 19160 and each device has a different num-ber. For example, you can have an internal SCSI device with ID0, and an external SCSI device with ID 6.n SCSI ID 7 has the highest priority on the SCSI bus. The priorityof the remaining IDs, in descending order, is 6 to 0, 15 to 8.n The Adaptec SCSI Card 19160 is preset to SCSI ID 7 and shouldnot be changed. This gives it the highest priority on the SCSIbus.n Most internal SCSI hard disk drives come from the factory pre-set to SCSI ID 0.