Configuration and Jumper Options
SCSI ID Selection
Jumpers at ID0, ID1, and ID2 select the SCSI address. Each SCSI device on one Host Adapter must have a unique address. ID selection is binary, as shown here.
SCSI ID ID2 ID1 ID0
0 (default) out out out
1 out out in
2 out in out
3 out in in
4 in out out
5 in out in
6 in in out
7 in in in
RN9 provides termination for the SCSI interface lines. Default is RN9 installed. SCSI terminators are installed only in the end devices on the SCSI cable; remove them from each of the other devices.
A jumper is installed at W1, at W2, or at W2 and W31 to select the source of terminator power (+5V) for interface terminator RN6. Do not install terminators at both W1 and W31.
If a jumper is installed at W1 (the factory default configuration, the drive provides terminator power. This configuration is used for PC/AT applications.
If a jumper is installed at W2, terminator power is provided by the host computer via interface connector J1, pin 26. If jumpers are installed at both W2 and W31, the drive provides terminator power both to its own terminator and also to the SCSI bus via interface connector J1, pin 26.
Note: W1 and W2 may be physically reversed from the way shown in the drawing above (see the board on your drive); the functions are as stated here.
A jumper at W3 controls the spindle option.
No Jumper The drive starts the spindle motor at power-on. (Default)
Jumper The drive waits for a Start Unit SCSI command to
start the motor.
Bus Parity Check
A jumper at W9 selects the bus parity check option. The drive always generates
parity regardless of this option.
Jumper SCSI interface parity checking disabled.
No Jumper SCSI interface parity checking on. (Default)