Terminating the scsi chain, Dip switch configuration – Nikon LS-10 Installation Guide for Windows User Manual
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The SCSi interface
Chapter 3
Default ID
DIP Switch Configuration
SCSI ID
DIP#1
DIP #2
DIP #3
0
Off
Off
Off
1
On
Off
Off
2
Off
On
Off
3
On
On
Off
4
Off
Off
On
5
On
Off
On
6
Off
On
On
Table 3.2
Configuration DIP switch values for corresponding SCSI ID number. SCSI ID #5
indicates factory default setting.
Terminating the SCSI Chain
The SCSI chain is the electrical bus connecting two or more SCSI devices. It is
critical that this bus be correctly terminated for the SCSI devices to operate properly.
Termination is an electronics term that applies to the impedance found at both
ends of the bus. The electrical signals on the SCSI bus are changing rapidly between
their digital ‘on’ and ‘off states. To minimize electrical ‘noise,’ a terminator \s placed on
each end of the SCSI bus. The effects of this termination may be unseen to you, but are
critical nonetheless.
Incorrect SCSI termination can cause unpredictable errors.
Typically, the PC sits at one end of the SCSI bus. Assuming this is the case, the
SCSI controller card in the PC must be terminated.
If one other SCSI device shares this SCSI bus, it also must be terminated. If addi
tional SCSI devices sit on the bus in between the two end SCSI devices, these devices
cannot be terminated. The SCSI chain will only operate properly if termination is in place
at the beginning and end of the SCSI bus.
Improperly terminated SCSI devices can immediately cause errors or may work
correctly for a period of time before generating their first errors.
If you are installing an LS-10, please proceed to the section “Terminating the
LS-IO.”
Page 18
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