Adaptec AVA-1505 Installation Manual

Also see for AVA-1505: Specification sheet

Contents

Adaptec AVA-1505 Installation Manual Manual pdf 4 page image

3Connecting PeripheralsSetting SCSI IDsYou must assign a different SCSI ID to each device onthe AVA-1505 SCSI bus. See your SCSI peripheraldocumentation for directions on how to determinethe ID and change it. The default SCSI ID forAVA-1505 host adapters is SCSI ID 7.Connecting CablesSCSI devices are cabled together in a single, con-nected series called the SCSI bus. The SCSI bus cablesmust run sequentially from one device to the next.The host adapter is at the end of the SCSI bus ifeither the internal or the external SCSI connector isunused. The host adapter is in the middle of the busif internal and external SCSI devices are installed.Caution: AVA-1505 host adapters supportonly single-ended SCSI devices. DifferentialSCSI devices may be damaged if connectedto the host adapter. The peripheral docu-mentation will tell you whether the deviceis single-ended or differential.1 Lay out the cables and find the pin-1 element ofeach cable and peripheral connector.On internal cables, pin 1 is usually marked with acontrasting color on one edge of the ribbon cable,and a small triangle marks pin 1 on the SCSI con-nector. External cable connectors can only beplugged-in one way, so pin-1 orientation isautomatic.2 Attach the SCSI cable(s) to the host adapter andthe peripheral(s), using the internal and/or exter-nal connector(s).3 Be sure to maintain correct pin-1 orientationthroughout the bus. The AVA-1505 uses a 25-pinDB25 external connector (Apple compatible), anda 50-pin flat ribbon-type internal connector.Terminating the SCSI Bus CableThe last physical SCSI device on either end of theSCSI bus must have a set of resistors called termina-5