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 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.
Jumpers W1 and W2 select the source of terminator power (+5V) for the interface terminator. If a jumper is installed at W1 and no jumper is installed at W2 (the factory default configuration), the drive provides terminator power. This configuration is used for PC/AT applications.
If no jumper is installed at W1 but a jumper is installed at W2, terminator power must be supplied by the host computer system via interface connector J1, pin 26.
W11 allows the drive to supply interface termination power to the SCSI bus.
If W11 is not installed and W1 is installed (the factory default configuration), the drive does not supply SCSI bus interface termination power. W11 should not be installed for PC/AT applications.
A jumpers at W5 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 W4 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)
Frame Ground Option
A jumper at W28 is used to connect the drive's logic ground to its frame ground. The factory default configuration, which should be used for PC/AT applications, is a jumper installed at W28.
Jumper Frame ground connected to logic ground.
No Jumper Frame ground not connected to logic ground. (Default)