LSI 8751D - Manual (Page 30)

2-14 Installing the LSI8751D
2.2.4 SCSI Bus Termination
The devices making up the SCSI bus are connected serially (chained
together) with SCSI cables. The first and last physical SCSI devices
connected on the ends of the SCSI bus must have a set of resistors
called terminators. All other SCSI devices on the bus must have their
terminators removed or disabled. Remember that the LSI8751D is also
on the SCSI bus; if you position the host adapter at the end of the SCSI
bus, you must place the supplied HVD terminator on the unused
connector (J2 or J3).
The peripheral device terminators are usually set with jumpers, resistor
modules, or a switch on the peripheral. Refer to the peripheral
manufacturer’s instructions and to the user’s manual for your computer
for information on how to identify the terminator setting of each device
and how to change it.
The LSI8751D automatically covers SCSI bus termination for three
different bus configurations, depending on the use of the connectors J2
and J3 on the LSI8751D (see
Figure 2.1 ). The three bus configurations
are
•
only for internal SCSI connections to connector J2
•
only for external SCSI connections to connector J3
•
for SCSI connections to both J2 and J3 connectors
Termination on the LSI8751D for these three different bus configurations
is discussed in the following sections.