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ST12450W/WD Installation Guide, Rev. B 21
ST12450W (single-ended) drives are terminated with
permanently mounted active IC terminators. If you install
an ST12450W drive and it is not on the end of the
SCSI bus, remove the jumper from pins 11 and 12 of
connector J4 (see Figure 4). This disables the termina-
tors on the drive. If you install an ST12450W drive on the
end of the SCSI bus, ensure that a jumper is installed on
pins 11 and 12 of connector J4.
Note. Use active t erminators when terminating the bus.
ST12450WD (differential) drives do not have internal
terminators or any other way of adding internal termina-
tion to the drive. You must provide external termination
to these drives when termination is required.
Power
Connector
Pin 1
J4
J01
Enable drive terminators.*
J4
Pin 1
Disable drive terminators.
* Valid for single-ended drives only.
Drive Termination Options
Figure 4. Terminating ST12450W drives