Seagate 240 DDS-4 manual Scsi Address Selection pins 1 through, Parity checking pins 9

A-12 Scorpion 240 Autoloader Installation Manual

SCSI Address Selection (pins 1 through 8)

Each SCSI device on a SCSI bus must have a unique SCSI ID. The SCSI controller or host adapter generally uses ID 7. In some systems, the boot drive uses ID 0 or ID 1.

You can select an appropriate SCSI address used by the drive by placing the appropriate jumpers on pins pairs 1-2 through 7-8, as shown in Figure 1.

Note: SCSI ID numbers 8 through 15 will only be recognized if dip switch 9 is “ON.” See page A-14 for details.

Parity checking (pins 9 and 10)

If a jumper is installed on pins 9 and 10, parity checking is enabled. If no jumper is installed, parity checking is disabled, but parity is still generated by the drive.

Terminator power (pins 11 and 12)

If a jumper is installed on pins 11 and 12, terminator power is enabled.

Note: The internal Scorpion 240 does not provide SCSI termination, and therefore should not be installed as the last device in a SCSI chain. See “SCSI termination” on page A-16 for more information.

If the terminator power jumper is installed, be careful not to short the TERMPWR signal to ground. In the event of a short, terminator power to the bus will be interrupted. After the short is removed, a fuse in the drive will automatically reset, restoring terminator power.

Changing dip-switch settings

To change data compression, MRS checking, power-on self- test diagnostics, operating system settings, Wide/Narrow SCSI selection, or the drive’s inquiry string, you must use the dip switches on the underside of the internal drive.