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II. System Components

SCSI Connections

Your server can support up to 15 user installed SCSI devices. Be sure to

include both internal and external SCSI devices in your device setup. Each

SCSI device (both internal and external) must have a unique address (or

SCSI ID). Check your SCSI device documentation for instructions. Be sure

to record all SCSI addresses so that you can prevent SCSI address conflicts.

SCSI devices are connected together in a "chain" by cables. Internal de-

vices connect to the motherboard with a 50 pin or 68 pin flat ribbon cable.

A converter may be used to connect 50 pin devices to the 68 pin cable but

not vice versa. External SCSI devices may be connected using an external

SCSI connector or SCSI card with an external connector. If there are more

than one internal or external devices, additional devices are connected with

cables to form a "daisy chain." Terminating the devices on the ends of the

SCSI Bus "chain" is necessary for SCSI devices to work properly. Devices

normally come with its termination enabled by jumpers or dip switches.

You must disable these termination for devices in between the ends.

All SCSI devices, including this motherboard with onboard SCSI, must have a SCSI

identification number that is not in use by any other SCSI device. There are sixteen

possible ID numbers, 0 through 15. The SCSI ID serves two purposes:

•

It uniquely defines each SCSI device on the bus.

•

It determines which device controls the bus when two or more devices try to use

it at the same time.

SCSI IDs on one channel do not interfere with the IDs on another channel. You can

connect up to 15 SCSI devices to this motherboard. You must set a SCSI ID number

(ID 0 to ID 15) for each device. Note that the onboard SCSI chipset is also a SCSI

device and will also require a SCSI ID number. SCSI devices vary in how they set the

ID number. Some use jumpers, others have some kind of selector switch. Refer to the

manual for any device you install for details on how to set its ID number.

The P2B-DS motherboard has an onboard 16bit single-channel SCSI chipset. SCSI

ID 15 has the highest priority, and SCSI ID 0 has the lowest priority.

See your SCSI card's User's Manual.

AP6000 Hardware Reference Guide