User Guide

Page 163
Appendix
SCSI ID
Make sure the SCSI ID of a SCSI device connected to a SCSI bus is
unique. For example, the ID of the MPC2000 is 6 and the ID of the
other devices connected should not be set to 6. To set the ID of exter-
nal SCSI devices connected, check the manual of that device.
Termination
A chain of SCSI devices must be terminated at either end and termi-
nating resistors are fitted to most SCSI devices when you buy them.
The MPC2000’s SCSI interface is terminated. It is most likely that
the MPC2000 will be at one end of the chain and so must be left termi-
nated. Any disks in between the MPC2000 and the last SCSI device in
the chain must be un-terminated (this can be done by physically re-
moving the resistors or sometimes via a DIP switch on the back of the
unit - please check the unit’s documentation). The last device in the
chain must be terminated.
MPC2000
Hard disk
MO drive
CD-ROM
Incorrect termination may give rise to data errors and possibly cor-
rupted data so please ensure it is done correctly. If you have any
doubts, please contact your dealer who will be able to help.
Cable Length
The SCSI specification states that the total length of the SCSI chain
must not exceed 6 metres. “Total length” means the length of the
whole chain between the first and the last device and not the length of
the cable between each of devices. SCSI chains that are longer than the
specified length may cause data errors and possibly corruption of data.
MPC2000
Hard disk
MO drive
CD-ROM
6 metres total
Terminated
Unterminated
Unterminated
Terminated