Installing Hardware Options
VAX 4000 Model 108 User Information 3–25
Connecting an External SCSI Option or Expansion Box
________________________ CAUTION ___________________________
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The recommended maximum length of SCSI cables (internal length plus
external length) is 19.6 feet (6 meters).
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Do not connect more than two tape drive devices per SCSI port.
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Some expansion boxes are restricted to either 110 V ac or 220 V ac
operation. Make sure that the voltage requirement of the expansion box
used is compatible with the supply voltage.
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Turn on the expansion boxes before you turn on the system unit. This
procedure ensures that the device in each expansion box is ready for use
and that the system firmware includes the device in the configuration
display.
•
•
Do not connect or disconnect SCSI expansion boxes while the system is
turned on. Doing so can cause damage to the equipment or corrupt
data.
•
•
Digital cannot guarantee the correct operation of any SCSI bus that
uses cable assemblies not supplied by Digital or not configured in
accordance with these guidelines.
____________________________________________________________
__________________________ Note _____________________________
Be sure to read the instructions that come with the SCSI device. If the cable
supplied with the SCSI device has the wrong type of connector, you will need a
different cable.
____________________________________________________________
To connect an external SCSI device, or a SCSI expansion box, follow these steps:
1. Set the drive jumpers or switches for the desired SCSI ID.
2. Remove the SCSI terminator and connect the option’s SCSI cable to the port. Be sure
that you use a cable with a SCSI 50-pin high-density type connector.
3. Terminate the new end of the bus at the last external SCSI device, using the
appropriate terminator. Make sure that any other external SCSI devices have their
terminators removed or disabled.
To check expansion box connections, enter the following from the console prompt:
>>> SHOW SCSI
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