Drive To Interface Connections - HP C2488A Technical Reference Manual

Drive To Interface Connections
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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
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