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Logic Address Plug/Select Indicator
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The logic address plug activates switches that establish the logical address·ofthe
device. When the select indicator on the address plug is lit, it indicatesac;;tivlty
from the controller. Logic address plugs are available with numbers 0 through 3
and are supplied with the unit. (They are also available as accessories.) Each
device must have a different plug number. A single drive subsystem must use
plug 0 only.
START Button!READY Indicator
Pressing the START button powers-on the unit. The READY indicator (green)
flashes until the discs are up to speed, the heads are loaded, and no-fault condi-
tion exists (power-on sequence). The READY indicator lights steadily when the
power-on sequence is complete. Pressing the START button again powers-off the
unit; the READY indicator flashes until disc rotation has stopped, then goes out.
FAULT Clear Button!FAULT Indicator
The FAULT indicator (red) lights if a fault exists. within the disk unit. It is turned
offby momentarily pressing the FAULT clear button, bya fault clear command
sent by the controller, or by a disk drive power-on operation.
WRITE PROTECT Button!
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WRITE PROTECT Indicator
Pressing the WRITE PROTECr button Oabeled WRT PRT) places the disk unit in
the write protect mode which prevents writing operations; the WRITE PROTECT
indicator (red) lights. Pressing the button again deactivates the protection and
the indicator goes out.
Controls and Indicators
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HD42-00
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