Seagate Elite 47 Installation Manual page 30

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Other applicable jumper options
Other option jumpers are available as illustrated below.
Spinup Delay Option (DS)
Immediate spinup (if the Start Command
option jumper is disconnected)
Spinup delay equal to the SCSI Bus ID
multiplied by 12 seconds (if the Start
Command option jumper is disconnected).
Start Command Option (ME)
Start spindle according to the Spinup
Delay option jumper.
Start spindle after the SCSI Bus sends
a Start Unit command.
SCSI Bus Parity Check (PD)
Check the parity of data bytes read from
the SCSI Bus.
Ignore parity check.
Reserved
Figure 8. Additional jumper options
Elite 47 Installation Guide, Rev. B
Pin 1
J4B
Pin 1
J4A
J01
Pin 1
J4B