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Connecting Peripheral Devices
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PowerCenter Pro User’s Guide
19
Turn your computer and any connected external devices off before making
any changes in termination. See the documentation that came with each
device for information about how it is terminated.
■
On the internal SCSI buses, any devices you install should be unterminated
because the computer's internal CD-ROM drive and hard drive are attached
to the end of the SCSI chains and are terminated. All of the available
internal connectors are in the middle of the chain.
■
On the external bus, you need to consider where the device is placed in the
chain and whether it has an internal terminator. (Most SCSI devices use
removable external terminators, but some older devices have built-in
terminators that are difficult to remove.)
■
If you have an internally terminated device, place it at the end of the chain
and remove or disable external terminators from other devices in the
chain.
■
If you have an internally terminated device, place it at the end of the chain
and remove or disable external terminators from other devices in the
chain.
■
If none of the devices are internally terminated, place an external
terminator on the last device in the chain and on no other device.
Connecting the device
Connecting an external SCSI device
The SCSI port, marked with g , provides high-speed communication between
the computer and devices such as hard disks, CD-ROM drives, scanners,
printers, tape backup drives, and so on.
To connect a single SCSI device (or the first device in a chain), you need a SCSI
cable with a 25-pin connector on one end and a 50-pin connector on the
other. For each additional cable, you need a cable with 50-pin connectors on
both ends. The cables you use should be double-shielded and have
2 Conn Periph Page 19 Friday, June 6, 1997 9:41 AM