Pioneer CD-ROM DRIVE UNIT DR-U16S - Manual (Page 13)

13
En
INSTALLATION
SCSI TERMINATION
SCSI termination is a technique used to absorb line reflections at the beginning and end of a SCSI daisy
chain that would otherwise interfere with legitimate SCSI signals and cause errors. To minimize interference
with data transfer, SCSI termination is absolutely required for proper operation of your Drive.
WHEN TERMINATION IS REQUIRED
If you are installing the Drive as the only SCSI device or as the last SCSI device in the chain, termination
must be enabled.
A built-in terminator switch is located on the rear panel. Function Switch #5 is used to enable or disable
termination as described on page 14.
8 7 6 5 4 3 2 1
DISABLE EJECT
2048/512 TERMINATION (SHORT – OFF)
RESERVED
SCSI ID
2 1 0
Switch #
RESERVED
As you can see in the above illustrations, whether you have an ON/OFF Terminator Switch or a Termination
Function Switch, your Drive has an ON/OFF termination option.
ON: The Terminator Switch must be open when the drive is:
♦
the only SCSI device connected to an interface card; and/or
♦
the last physical device in a daisy-chain.
OFF: The Terminator Switch must be short-circuited when the drive is:
♦
connected in the middle of a SCSI chain.
SETTING FUNCTION SWITCHES
Function Switches, also known as Jumper Switches, control the operational functions of the CD-ROM
Drive.
The jumper is ON when a short-circuit socket is inserted to short-circuit the upper and lower pin, and it is
OFF in open condition.