Drive
To
Interface
Connections
,
You should be aware
of
the following considerations when connecting
the
drive
to
the
SCSI
bus.
• Static
Damage
• Stub Length • Terminator
Power
• Resistive/Capacitive Loading • "Glitch" Generation
Caution
I
1. A void static damage
to
all components of a bus system by observing proper
handling and grounding procedures.
When plugging
a drive into an active or inactive bus, connect
the
drive's
ground
to
the
system ground before connecting
the
SCSI connector.
When unplugging
a drive from an active or inactive bus, disconnect
the
SCSI connector before disconnecting
the
power connector.
2.
The active terminators must have terminator power (TermPwr) applied
at
all times; either from
the
SCSI bus pin 26, or from
the
drive, or both.
The effects of connecting a drive
to
the
SCSI bus are as follows:
• Drive powered
off:
1. Connecting or removing a powered-off drive
to/from
an inactive bus will have no effect.
2.
Connecting or removing a powered-off drive
to/from
an active bus will have no effect
if
the
bus
is
loaded and terminated according
to
the ANSI specification.
3.
The
SCSI bus will operate properly with one or more drives connected
but
powered-off.
4. Applying power
to
a powered-off drive connected to
the
bus will have no effect if
the
bus
is loaded and terminated according to
the
ANSI specification .
• Drive powered on:
1. Connecting
or
removing a powered-on drive
to/from
an inactive bus will have no effect.
2.
Connecting or removing a powered-on drive
to/from
an active bus will have no effect
if
the
bus is loaded and terminated according
to
the
ANSI specification.
3. Removing power from a powered-on drive connected
to
the bus will have no effect
if
the
bus is loaded and terminated according
to
the
ANSI specification.
2-8 Product Installation
DRAFT
1/18/93 09:56
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