Adaptec AHA-2940AU User Guide - Page 3

your hard disk and other SCSI devices, refer to the device's documentation. The host adapter supports the SCSI Configured AutoMatically (SCAM) protocol, which assigns SCSI IDs dynamically and resolves SCSI ID conflicts automatically at bootup. If your system includes SCSI disk drives or other devices that support SCAM, you do not need to manually assign SCSI IDs to these devices. To enable SCAM support, see Configuring the Host Adapter on page 7. Most SCSI devices currently in use, however, do not support SCAM. The SCSI IDs on these devices must be set manually. To change the SCSI IDs on these devices, refer to the device's documentation. Note: If you plan to boot your computer from a SCSI device attached to the host adapter, set the Boot Target ID setting in the SCSISelect utility to correspond to the SCSI ID of the device you are booting from (see Configuring the Host Adapter on page 7). SCSI Terminators To ensure reliable communication, the SCSI bus must be properly terminated. Termination is controlled by a set of electrical resistors, called terminators. Terminators must be placed (or enabled) at the two extreme ends of the SCSI bus. All devices that lie between the ends must have their terminators removed (or disabled). Terminating the AHA-2940Ultra Termination on the AHA-2940Ultra itself is controlled by software commands via the SCSISelect® utility. The default setting is Automatic, which works like this: s If the AHA-2940Ultra detects that a cable is connected to either its internal or external SCSI connector, then it enables its terminators (the AHA-2940Ultra is at the end of the SCSI bus). 3