UMAX Astra MX3 Owner’s Guide13computers and PCs is located on the back panel of the computer, or on aUSB interface card.2. Plug the square connector end of this cable into the port located on theback panel of the scanner.Connecting the SCSI CableIf your Macintosh computer has a SCSI port, follow these instructions toconnect the scanner to your computer.Note: If you do not already have your SCSI interface card installed in yourcomputer, install it now. Refer to the installation instructions that came withthe SCSI card.1. Turn off the computer and the scanner.2. Connect the SCSI cable to the SCSI port on the computer.3. Attach the other end of the SCSI cable into the first SCSI connector onthe backside of the scanner (closest to the left side).Note: If your scanner is not chained to other SCSI devices, connect theTerminator to the remaining SCSI port of your scanner.Changing the SCSI AddressChanging the scanner’s SCSI address is necessary if more than one peripheralis connected to the SCSI port and two or more of the peripherals have thesame address or ID number.To change the scanner’s SCSI address:1. Check the other peripherals for their SCSI address or ID number. YourAstra MX3 SCSI address is preset to 5. If no other peripherals use 5 as aSCSI address or ID number, you are done. If another peripheral’s addressis 5, proceed to the next steps.2. Unplug the scanner from its power source.3. Gently turn the dial located at the back of the scanner, on the right-handside, until an unused number appears.SCSIConnectorPort