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The following table shows the function of each jumper.
Notes:
● The upper row of pins is (without position KEY) is ground.
● Remove jumper to set OFF, install jumper to set ON.
● ID SELECT, PREVENT/ALLOW, and TEST MODE are recognized
when the power supply is turned on or the SCSI bus is reset.
● TEST MODE is used exclusively for factory testing.
Do not set TEST MODE to ON. Doing so may cause unexpected
results.
Hardware Installation 11
Jumper
DEVICE
TYPE
ID SELECT
ID number
0
1
2
3
4
5
6
7
Jumper settings
0
OFF
ON
OFF
ON
OFF
ON
OFF
ON
1
OFF
OFF
ON
ON
OFF
OFF
ON
ON
2
OFF
OFF
OFF
OFF
ON
ON
ON
ON
KEY
PREVENT/
ALLOW
TEST MODE
Used to prevent the SCSI bus interface connector
from being plugged in upside down.
ON: Allows insert and removal of a CD caddy
with the eject button and the eject
command.
OFF: Prevents insert and removal of a CD
caddy with the eject button or an eject
command.
ON: Enables test mode.
OFF: Enables normal operation.
Function
The setting of this jumper determines whether the
SCSI device type code in the inquiry data is WO
or CD-ROM.
ON: WORM
OFF: CD-ROM
Assign the drive unit’s ID number by setting these
jumpers to ON or OFF. Do not assign the same
number as one used for other SCSI device.
Factory settings
Step 5: Setting the Jumpers
Set jumpers on rear of drive unit according to your computer
configuration. Jumpers are factory preset as shown below.
10 Hardware Installation
5V+5%
GND
DEVICE TYPE
L GND R
0
1
2
ID SELECT
PREVENT/ALLOW
TEST MODE
INTERFACE CONNECTOR
AUDIO OUT
F.GND
DC INPUT
12V+10%
-
-
Terminators
0 1 2
DEVICE TYPE
ID SELECT
PREVENT/ ALLOW
TEST MODE
KEY
= Pin removed