Seagate ST31230DC, Руководство по эксплуатации продукта

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Product Manual - Hawk 2LP Family (Wide) SCSI-2 (Volume 1), Rev. A 35
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continued from previous page
TP Position A (Applies to “W” 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.
J1-Auxiliary
Jumper
Jumper Function Description (“W” and “WD” models only)
Installation Drive ID on SCSI Bus (J1-auxiliary or J6 may be used, as the ID circuits are wired in parallel).
A
3
,A
2
,A
1
,A
0
The drive ID is binary coded positionwise i.e. jumper in position A
3
is drive ID 8, A
2
is drive ID
4, position A
1
is ID 2, position A
0
is ID 1 and no jumpers is ID 0. Default is ID = 0. Both J1-
auxiliary and J6 should not be used at the same time, because at some future time when the
ID is changed the user could fail to configure both J1-auxiliary and J6 the same. “WC” and “DC”
Models, do not have J1-auxiliary.
J6
Jumper
Installation
Jumper Function Description (“W” and “WD” models only)
A
3
,A
2
,A
1
,A
0
Drive ID on SCSI bus. Either J6 or J1-Auxiliary (optional) may be used to select drive ID.
Both should not be used at the same time, because at some future time when the ID is changed
the user could fail to configure both the same. Default is ID = 0.
For “WC” and “DC” models refer to Note [4].
LED Time shared (see Note [4]) J6 pin 8 used to connect a cable for a remote drive activity LED
indicator. Pin 8 (bottom), the cathode connection connects in the drive to GRD through the
emitter-collector junction of a transistor switch that controls the LED on/off condition. Pin 11,
the anode connection, connects in the drive to the +5 V supply through a pull-up resistor. For
"WC" and "DC" models, LED signal in J1 may be used instead. See Note [2].
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.
The interface physical characteristics to the "WC" and "DC" models are given in Figure 11.6.3-1b and in Tables
11.6.3-1b and 11.6.3-1d.