User guide

SC3500 User Guide Ver 1.3 March 8, 2005 Page 21 of 28
5.2 SCSI ID Selection
The SC3500 can use any of the 8 SCSI IDs available on the SCSI bus, although the
highest priority device, SCSI ID 7, is usually reserved for the initiator. Switch
selection for each SCSI ID is shown below. The SCSI Selection switch, E8,
determines whether the jumper block or switch is used to select the SCSI ID.
SWITCH
SCSI SEL
JUMP
SCSI2
JUMP
SCSI1
JUMP
SCSI0
SW
E3
SW
E2
SW
E1
SCSI ID
SELECTED
OFF X X X OFF OFF OFF 0
OFF X X X OFF OFF ON 1
OFF X X X OFF ON OFF 2
OFF X X X OFF ON ON 3
OFF X X X ON OFF OFF 4
OFF X X X ON OFF ON 5
OFF X X X ON ON OFF 6
OFF X X X ON ON ON 7
ON* OFF OFF OFF X X X 0*
ON OFF OFF ON X X X 1
ON OFF ON OFF X X X 2
ON OFF ON ON X X X 3
ON ON OFF OFF X X X 4
ON ON OFF ON X X X 5
ON ON ON OFF X X X 6
ON ON ON ON X X X 7
* default setting is SCSI ID0 selected from jumpers
5.3 Write Protection
Switch position E6 or the WP jumper is used to write protect the SC3500. When the
host processor sends a write command, the condition of this switch is checked. If
the switch or jumper is on, writes are disabled, and an error message will be
returned to the SCSI controller. Moving both the switch and jumper to the off
position will enable writes on the board, allowing full read/write access to the
memory array.
5.4 Termination
The SC3500 employs active termination. Termination is normally disabled on the
drive. To enable termination, set the switch at location E4 on or install the
Termination jumper on the jumper block.