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5
Connecting Peripherals
Setting SCSI IDs
You must assign a different SCSI ID to each device on
the AVA-1505 SCSI bus. See your SCSI peripheral
documentation for directions on how to determine
the ID and change it. The default SCSI ID for
AVA-1505 host adapters is SCSI ID 7.
Connecting Cables
SCSI devices are cabled together in a single, con-
nected series called the SCSI bus. The SCSI bus cables
must run sequentially from one device to the next.
The host adapter is at the end of the SCSI bus if
either the internal or the external SCSI connector is
unused. The host adapter is in the middle of the bus
if internal and external SCSI devices are installed.
Caution:
only single-ended SCSI devices. Differential
SCSI devices may be damaged if connected
to the host adapter. The peripheral docu-
mentation will tell you whether the device
is single-ended or differential.
1
Lay out the cables and find the pin-1 element of
each cable and peripheral connector.
On internal cables, pin 1 is usually marked with a
contrasting color on one edge of the ribbon cable,
and a small triangle marks pin 1 on the SCSI con-
nector. External cable connectors can only be
plugged-in one way, so pin-1 orientation is
automatic.
2
Attach the SCSI cable(s) to the host adapter and
the peripheral(s), using the internal and/or exter-
nal connector(s).
3
Be sure to maintain correct pin-1 orientation
throughout the bus. The AVA-1505 uses a 25-pin
DB25 external connector (Apple compatible), and
a 50-pin flat ribbon-type internal connector.
Terminating the SCSI Bus Cable
The last physical SCSI device on either end of the
SCSI bus must have a set of resistors called termina-
AVA-1505 host adapters support
3
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