Ensure that your computer and all other SCSI devices are turned off whenever you connect or disconnect cables.
A SCSI chain must have terminators at both ends. Terminators are needed because any cable reflects a portion of the electrical signals that reach the end of the cable. The terminator absorbs those reflections to minimize interference with data transfer.
The HP PhotoSmart Photo Scanner is a self-terminating device. When one SCSI connector is plugged into the back of the scanner, it is automatically terminated. When two connectors are plugged into the back of the scanner, the termination is disabled.
If you connect the HP PhotoSmart Photo Scanner directly to the computer or between two other devices in the SCSI chain, the terminators are automatically enabled or disabled, as needed. If you connect the HP PhotoSmart Photo Scanner as the last device in the SCSI chain, it will be necessary to remove or disable the terminators in the SCSI device that was previously last in the chain. Because different SCSI devices have different methods of enabling or disabling their terminators, it may be necessary to consult the documentation for that particular device to see how it is done.
If functioning external devices are already connected to the SCSI card, nothing needs to be done with the SCSI card terminators. However, if this is the first external SCSI device being attached to the SCSI card, it may be necessary to remove or disable the SCSI card terminators. Since different SCSI cards use different methods for removing or disabling termination, please consult the SCSI card documentation to see how it is done.