Seagate STT20000N, Product Manual

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Installation Chapter 3
STT20000N Product Manual Page 19
Figure 3-2
Jumper configurations
10
9
6 4
3
2
1
12
11
14
13
16
15
8
SCSI ID
PARITY ENABLED
JUMPER 7-8 ON
RESERVED
RESERVED
ACTIVE TERMINATION
JUMPER 13-14 ON
TERMINATOR POWER ENABLED
JUMPER 15-16 ON
JUMPER ON JUMPER OFF
PIN PIN PIN
SCSI
ID
5 3 1
6 4 2
0
1
2
3
4
5
6 OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
OFF
ON
ON
OFF
OFF
ON
ON
7
OFF
OFF
OFF
OFF
ON
ON
ON
ON
7 5
Notes: In Figure 3-2, ON means that the jumper shunt is placed over the two
vertical pins. OFF means that the jumper shunt is removed from the two
vertical pins (or hanging over only one of the pins).
The drive must be turned OFF; then, ON in order for the jumper placements
to take effect, or a SCSI Bus Reset must be received.
If the default address setting ID is correct for your system, and you do not choose to
change any other options, go to the following section that explains how to install the
drive unit.
If you need to change any default settings, refer to Figure 3-2 and the appropriate
following section; make the changes and then go to the following section that
explains how to install the drive unit.
SCSI device address jumpers
Be sure that no other device on the SCSI bus has the same SCSI address.
Figure 3-2 shows the jumper placements for the various SCSI ID choices.
Parity
To enable parity, place a jumper shunt over the two pins—7 and 8—as shown in
Figure 3-2. Be sure the jumper shunt is firmly in place.
SCSI terminator enable
The last device on the SCSI bus must have termination. Figure 3-3 illustrates the
termination for two daisy-chain configurations.