8-38 SCSI and I/O
Table 8-18 A3351A Configuration Jumper Descriptions
Connector/
Pin Set
Function Function Description
J1 1-3 TermPower to
SCSI Bus
Open: Drive does not supply term power to SCSI bus pin 26.
Jumpered: Drive supplies termination power to SCSI bus pin 26. (Default)
J2 1-2 Reserved Leave open.
3-4 Reserved Leave open.
5-6 Parity Disable Open:Parity checking and reporting by the drive enabled. (Default)
Jumpered: Drive does not report the results of pairyt checking to the host.
7-8 Write Protect Open: Drive is not protected (Default) .
Jumpered: Drive is write-protected.
9-10 Enable Motor
Start
Open:Spindle start immediately after power-up. (Default)
Jumpered: Drive spindle does not start until Start Command is received
from the host.
11-12 Delay Motor
Start
Open:Motor start is controlled by Enable Motor Start setting. (Default)
Jumpered: Spindle startup is delayed by SCSI ID times 12 after power is
applied.
13-14 Reserved Leave open.
15-16 Reserved Leave open.
17-18 Reserved Leave open.
J4 1 SCSI ID 0 Provides connerction (with Gnd, pin10) for remote SCSI ID 0 select.
Open=0.
2 Fault LED Provides output for fault LED signal.
3 SCSI ID 1 Provide connection (with Gnd, pin 10) for remote SCSI ID 1 select. Open=0.
4 Vendor unique Not used.
5 SCSI ID 2 Provide connection (with Gnd, pin 10) for remote SCSI ID 2 select. Open=0.
6 Spindle Sync Provides spindle sync signal SSREF oputput.
7 SCSI ID 3 Provide connection (with Gnd, pin 10) for remote SCSI ID 3 select. Open=0.
8 Unit Active
LED
Provides output (neg) for drive action LED
9 Enable Term. Not used on differential drives.
10 Ground Provides signal for signal ground.
11 (+) 5 Volts Provides connection for +5 volts.
12 No connection
13-20 Reserved
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