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SCSI termination 17SCSI termination 17SCSI termination 17
SCSI termination
Unlike audio signals, digital signals only have two values: high and low (+5V and 0V).
When no data is being transmitted, it is important that SCSI bus lines are kept in the high
state (+5V), so that when data is transmitted there is a clear distinction between high and
low pulses and the data is transferred without error. To achieve this, a device known as a
SCSI terminator is connected in the SCSI daisy chain. A terminator is usually fitted to the
last device in the chain.
Some SCSI devices have a terminator built-in. In this case that device should be connected
at the end of the daisy chain. Other devices, like the CBX-D5, are supplied with an in-line
type terminator and this can be connected as shown below.
NOTE:
If the SCSI daisy chain is not terminated correctly, numerous problems
including data corruption, system crashes, and intermittent glitches can
occur. If you have just set up your SCSI daisy chain or have added a new
SCSI device to it and it is not working as it should, check that the SCSI daisy
chain is terminated correctly. If the problem persists, try connecting the SCSI
devices in a different order.
Terminate
this device
HARD
DISK 1
CBX-D5HARD
DISK 2
SCSI SCSISCSI
To the next
SCSI device
CBX-D5 (Top view)
(In this case the CBX-D5 is the last device
connected in the daisy chain, so the SCSI
terminator is connected as shown)
SCSI PLUG SCSI
TERMINATOR
HARD DISK 2
SCSI PLUGSCSI PLUG
SCSI CABLE