Configuration and Jumper Options
(Pin numbers refer to the Option Jumper Block)
SCSI ID Selection
The SCSI ID (drive address) jumpers are identified as ID0, ID1, and ID2. 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
If terminators are installed at RN1 and RN2 (default), the drive provides termination for the SCSI interface. If the terminators are not installed, the drive does not provide interface termination.
SCSI terminators are installed only in the end devices on the SCSI cable; remove the terminators from each of the other devices. The SCSI Host Adapter card and the last drive in the chain should have terminators.
W1 and W2 select the source of power (+5V) for terminators RN1 and RN2; W3 controls the drive supplying +5V to the bus.
W1 W2 W3
Y N - Drive provides terminator power. (Default)
N Y - Host provides terminator pwr via J1 pin 26
to RN1 and RN2
- - Y Drive supplies +5V to the bus via J1 pin 26.
Jumpers at SP0 (Pins 11 and 12) and SP1 (Pins 13 and 14) control the spindle options.
N N The drive starts the spindle motor at power-on.
Y N The drive waits for a Start Unit SCSI command
to start the spindle motor.
N Y Spindle start-up is delayed based on SCSI ID
address (12 seconds per ID)
A jumper at WP (Pins 15 and 16) selects the write protect option.
Jumper The drive is write protected.
No Jumper The drive is not write protected. (Default)
A jumper at PTY (Pins 17 and 18) 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)
Spindle Sync Signals
SSYNC (Pin 23) is the spindle sync output signal pin when the drive is mode selected to be the master drive. Pin 23 is the spindle sync input
when the drive is mode selected to slave mode. MSYNC (Pin 21) is the spindle sync output
when the drive is mode selected to master control mode.
The odd-numbered pins opposite SSYNC and MSYNC are ground return lines for the corresponding signals.
A user-supplied LED may be connected to Remote LED (Pins 1 and 2).