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Configuring Internal SCSI Phasewriter DUALs

Applies to models:

PW-i650-6XS	PW-i650
PW-K650-6XS	PW-K650

The Phasewriter has four configurable settings that must be correct for proper functioning of the drive. These settings are as follows: LUN (logical unit numbering), SCSI ID number, termination and termination power. A jumper block located on the rear of the unit is used to configure the settings; it contains six jumper positions. Place a jumper over the jumper pins to set it "ON" and remove it to set it "OFF". The default settings are shown below.

Default Settings

LUN ON SCSI ID 4 Termination ON Termination Power ON

Default Settings

LUN Setting (Jumper #1)

This jumper configures whether the drive is being used on a Macintosh (or compatible) or a PC (IBM or compatible) computer. The first jumper on the jumper block sets the PC/MAC setting. If the drive is connected to a Macintosh, the jumper must be "ON". When the drive is connected to a PC, the jumper must be "OFF". The default setting is "OFF".

Macintosh setting

PC Setting

SCSI ID (Address) (Jumpers #2, 3 & 4)

Each SCSI device connected to a computer must be identified with a unique number called a SCSI ID. SCSI IDs can be any number from 0 to 6 as long as it is not being used by anyother SCSI device connected to the computer. The default SCSI ID is 4. Below are the settings for the possible SCSI ID numbers:

SCSI ID 0	SCSI ID 1	SCSI ID 2	SCSI ID 3
SCSI ID 4	SCSI ID 5	SCSI ID 6

Note: Do not set jumpers 2, 3 and 4 "ON"at the same time; this will set the drive to SCSI ID 7 which will conflict with your SCSI host adapter/interface.

Termination (Jumper #5)

When using a SCSI host adapter and SCSI devices, they make a chain called a SCSI chain. One requirement when using SCSI is that the two ends of the SCSI bus must be terminated.

 Internal Devices Only:
If you have only internal SCSI devices (that is, an internal Phasewriter and/or SCSI hard drive, SCSI CD-ROM, etc.), one end of the SCSI bus is the SCSI host adapter and the other end is an internal SCSI device. First the SCSI adapter must be terminated; refer to the instructions for your SCSI adapter on how to turn its termination "ON" (this has probably been set "ON" by default). If the Phasewriter is the last device on the chain from the SCSI adapter, it must be terminated; this accomplished by setting jumper 5"ON". The default for jumper 5 is "ON", as shown below:

Termination "ON"

Termination "OFF"

If you have other internal SCSI devices, and the Phasewriter is NOT the last device on the chain from the SCSI adapter, termination must be "OFF" by setting jumper 5 "OFF".

 Internal & External SCSI Devices:
Using internal and external SCSI devices is very similar to using only internal SCSI devices; the last internal device on the SCSI chain must have termination turned "ON". The difference is that the SCSI adapter inside your computer is no longer one of the end devices: the last external SCSI device must be terminated along with the last internal device (see above). Refer to the instructions that came with your SCSI adapter on how to turn its termination "OFF". Then make sure the last external SCSI device also has termination turned "ON" (if this device is a Phasewriter drive, check the instructions on external drive settings).

Termination Power (Jumper #6)

Along with termination, a SCSI chain must be provided with termination power. Simply, at least one SCSI device on the SCSI chain must power the chain's termination. If termination is set "ON" for the Phasewriter, you should also turn termination power "ON"; this is done setting jumper 6 "ON". If the Phasewriter is not the last device and does not need to be terminated, you can turn termination power "OFF", though it will not hurt to leave it on. The default is termination power "ON".

Termination "ON"

Termination "OFF"

Usually the same device(s) that is/are terminated also provide termination power.

Termination and Termination Power "ON"

Termination and Termination Power "OFF"

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