Installing The Scsi Terminators - Epson ExpressStation User Manual

Installing the SCSI Terminators

Your configuration of SCSI devices, both internal and external,
will communicate with each other and with the SCSI controller
along the SCSI bus. For the SCSI subsystem to operate
properly, you must install special resistor packs called
terminators to mark the devices on both "ends" of the SCSI bus.
The ends of a bus are the first device at one end of the bus (an
internal SCSI drive, for example) and the last device on the
other end (the last external device on the external cables).
Since the SCSI controller is counted as a device on the SCSI bus,
the first or last device on the bus could be the SCSI controller.
For example, if you have installed only an internal SCSI hard
disk, the first device on the bus is the hard disk and the last
device is the controller.
Terminators are usually installed on the printed circuit board of
a SCSI device. In your computer, the terminator for an internal
SCSI hard disk drive is soldered onto the disk drive riser board
in your system's drive housing. Therefore, you do not need to
install a terminator if you use an internal SCSI drive. The
terminator for the external end of the SCSI bus came in the box
with your computer.
Before you connect devices to the internal or external SCSI
connectors, follow these guidelines to connect the terminators
properly:
subsystem: the first device on the SCSI bus and the last
device. Since all SCSI devices come with terminators, you
must remove the terminators from any other devices in the
subsystem.
Using the SCSI Subsystem 4-3