Chapter 13: Appendix
Page 190
Terminated
Unterminated
Unterminated
Terminated
SCSI ID
Make sure the SCSI ID number of the device connected to a SCSI bus is unique. For example, the
ID of the MPC2000XL is 6 and the ID of the other devices connected must be set to any number
other than 6. To set the ID of external SCSI devices, check the manual of the device.
Termination
A chain of SCSI devices must be terminated at either end and terminating resistors are fitted to
most SCSI devices when you buy them. The MPC2000XL’s SCSI interface is terminated. It is
most likely that the MPC2000XL will be at one end of the chain and so must be left terminated. Any
disks in between the MPC2000XL and the last SCSI device in the chain must be un-terminated
(this can be done by physically removing 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 termi-
nated.
Incorrect termination may give rise to data errors and possibly corrupted 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.
MPC200XL
Hard disk
MO drive
CD-ROM
6 metres total
MPC200XL
Hard disk
MO drive
CD-ROM
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