Grounding - Seagate ST32430N - Hawk 2.1 GB Hard Drive Product Manual

Product Manual - Hawk 2LP Family SCSI-2 (Volume 1), Rev. A
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TP Position A (Applies to "N" models only)
On This horizontally positioned jumper across the two TP positions nearest PCB edge, connects
terminator power from SCSI bus I/O pin 26 to the drive's internal terminators (for single-ended
I/O only).
Off See above explanations for TP jumpers.
J5
Jumper
Installation
A ,A ,A Drive ID on SCSI Bus (J6 may be used instead, as J5 and J6 are in parallel. Use only one
0 1 2
set for drive ID). The drive ID is binary coded positionwise i.e., jumper in position A
ID 4, in position A
J6
Jumper
Installation
A ,A ,A Drive ID on SCSI bus. Either J5 or J6 (optional) may be used to select drive ID. Both should
2 1 0
not be used at the same time, because at some future time when the ID is changed the user
could fail to configure both J5 and J6 the same. Default is ID = 0.
LED No jumper ever installed. These pins used to connect a cable for a remote LED indicator. Pin
3 (top, nearest HDA), the anode connection, connects in the drive to the +5V supply through
a pull-up resistor. Pin 4 (bottom), the cathode connection connects in the drive to signal
common through the emitter-collector junction of a transistor switch that controls the LED on/
off condition.
10.2

Grounding

Signal ground (PCB) and HDA ground are connected together in the drive and cannot be separated by the user.
The equipment in which the drive is mounted is connected directly to the HDA and PCB with no electrically
isolating shock mounts. If it is desired for the system chassis to not be connected to the HDA/PCB ground, the
systems integrator or user must provide a nonconductive (electrically isolating) method of mounting the drive
in the host equipment.
is ID 2, position A is ID 1 and no jumpers is ID 0. Default is ID = 0.
1 0
31
is drive
2