| 0663-E15, 0663-E12 |
| Jumper settings |
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| The jumper block shown below is used to select the SCSI device ID, to control the
spindle motor start and to select the appropriate option pin (B1) function. There are
four ground pins, A1, A2, A3, B2. If pin B1 is jumpered to ground, drive initiated
synchronous negotiation is disabled, but requests from the initiator will still be
accepted. Option block ground pins must only be used for selecting jumper block
functions. |
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| Figure 1 option block |
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With the auto start jumper in place the motor spins up when power is applied. With
the auto start jumper removed the motor spins up when the drive is issued a start unit
command. Jumper block pins B3 and D3 provide spindle synchronization capability. Jumper
block pins B4 and D5 provide direct drive capability to an activity LED. |
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Note: During the power up sequence the option pin is interrogated. If it is
grounded the pin remains an input. If it is not grounded it becomes an output,
indicating motor active or command active depending on the state of the CMDAC bit in
mode page 0. |
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