Adaptec 39320D-R Manual

Also see for 39320D: User guide

Contents

connecting external scsi devices

5The Adaptec SCSI Card 39320D is preset to ID 7 for each channeland should not be changed. If you boot from a SCSI hard disk,make sure the hard disk SCSI ID is set to 0. (Most SCSI hard disksare preset to SCSI ID 0 at the factory.) The SCSI IDs for internaldevices are usually set with jumpers; SCSI IDs for externaldevices are usually set with a switch on the back of the device.Terminate the EndsTo ensure reliable communication on the SCSI bus, the device atthe end of each cable, or the end of the cable itself, must have aterminator installed (or enabled). Terminators must be removed,or termination must be disabled, on devices between the ends ofeach cable.You can connect a total of 30 SCSI devices to the Adaptec SCSICard 39320D,with up to 15 devices on each SCSI channel. Beforeconnecting devices, be sure to review Setting Up SCSI Devices onpage 4.Connecting Internal Ultra320/160 and Ultra2 DevicesA special 68-pin internal LVD cable is needed to connect internalUltra320/160 or Ultra2 SCSI devices. If your cables are notmarked, you can identify most LVD cables as having twistedpairs of the flat ribbon cable between the device connectors. Somecables are laminated so that they lay flat. Internal LVD cablesusually have a terminator built into the end of the cable.When connecting Ultra320/160 or Ultra2 SCSI devices,the SCSI bus must be terminated either on the end of the cable(with a permanent terminator) or with a separate terminatingconnector. Ultra SCSI and earlier single-ended devices canterminate the bus directly from the device. If you use an UltraSCSI terminator on an LVD Ultra320/160 and Ultra2 SCSI bus,the SCSI devices will not operate properly. For this reason besure that you have the necessary Ultra320/160 or Ultra2 cableand terminator before installing the Ultra320/160 SCSIdevices.NOTECONNECTING SCSI D EVICES