Seagate MEDALIST 1080SL Installation Manual page 11

Medalist 1080sl SCSI Installation Guide, August 1995
nators enabled. If you are positioning the drive at the end of the
cable, you must enable the drive's internal terminators or attach
an external terminator to the end of the cable. Terminators on the
devices between the bus ends must be disabled or removed.
To enable the drive's terminators, leave the pin-pair 19 and 20
on jumper block J8 open.
To disable the terminators, place a jumper on pins 19 and 20
of jumper block J8.
Terminator power. The terminators must have a 5 volt power
source to be active. In general, the device that provides the
terminator also provides power for its terminator. Power for the
terminator may also be supplied through the SCSI cable (this is
usually done for external terminators). The Seagate drive pro-
vides settings for four implementations of terminator power:
Terminator power to the drive terminator and the SCSI bus—
install jumpers on pins 21 and 23 and on pins 22 and 24 of J8.
This is the default.
Terminator power to the drive terminators only—install a
jumper on pins 23 and 24 of J8.
Terminator power from another device to the bus and the
drive's terminator disabled—install a jumper on pins 21 and
23 of J8.
Terminator power to the bus only and the drive terminator
disabled—install a jumper on pins 22 and 24 of J8.
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