Adaptec 2944UW Installation Guide - Page 3

Installing the Host Adapter and SCSI Devices Installing the AHA-2944UW Follow these instructions to install the AHA-2944UW: 1 Turn OFF power to the computer and peripheral devices, and disconnect the power cords. 2 Remove the cover from the computer case. 3 Locate an unused 32-bit PCI expansion slot that sup- ports bus master data transfers, then unscrew and remove the metal bracket that covers the card-slot opening. (Save the screw to use when securing the host adapter in your computer.) PCI slots are shorter than ISA or EISA slots and are typically white. Usually there are three PCI slots. (One of these may be a shared slot into which you can insert either an ISA/EISA board or a PCI board.) 4 Insert the AHA-2944UW in the PCI slot. Press it down firmly so that the contacts are securely seated in the slot. 5 When the AHA-2944UW is firmly seated in the slot, secure the metal bracket of the host adapter with the screw you removed in step 3. Do not replace the computer cover or reconnect your computer and peripherals to their power sources yet! Assigning SCSI ID Numbers The AHA-2944UW and each device connected to it must have a unique SCSI ID number ranging from 0 to 15. We recommend that you leave the AHA-2944UW host adapter set to its default setting of SCSI ID 7. If you need to change the AHA-2944UW SCSI ID, see Running SCSISelect on page 8. If you need to change the SCSI ID on a hard disk drive or another SCSI device, refer to the device's documentation. Note: If you plan to boot your computer from a SCSI device attached to the AHA-2944UW host adapter, and the device is not assigned the lowest installed SCSI ID, set the Boot Target ID setting in the SCSISelect utility to correspond to the SCSI ID of the device you are booting from (see Using SCSISelect on page 5). Setting SCSI Termination SCSI termination is controlled by a set of electrical resistors called terminators. Terminators must be installed (or enabled) at the two extreme ends of the SCSI bus. All devices between the ends must have their terminators removed (or disabled). Terminating the AHA-2944UW Termination on the AHA-2944UW itself is controlled by software commands via the SCSISelect utility. The default setting is Automatic, which works like this: s If the AHA-2944UW detects that a cable is attached to one SCSI connector, it enables its terminators (the AHA-2944UW is at the end of the SCSI bus). s If the AHA-2944UW detects that cables are attached to two connectors (either the two internal connectors or one internal and one external connector) it disables its terminators (the AHA-2944UW is in the middle of the SCSI bus). We recommend that you leave the AHA-2944UW set to its default setting of Automatic. If you need to manually set AHA-2944UW termination run the SCSISelect Utility, as described on page 8, and select a setting as indicated in this table. Devices Connected to AHA-2944UW 68-pin internal connector only 68-pin external connector only 68-pin internal and 68-pin external connectors 50-pin internal connector only 50-pin and 68-pin internal connectors 50-pin internal and 68-pin external connectors AHA-2944UW Termination Low High ON ON ON ON OFF OFF ON ON OFF ON OFF ON 2