Scsi Termination - Yamaha CBX-D5 Operating Manual

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.
SCSI PLUG
To the next
SCSI device
NOTE:
HARD
SCSI
DISK 1
HARD DISK 2
SCSI PLUG
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.
HARD
SCSI
DISK 2
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 CABLE
SCSI termination SCSI termination SCSI termination 17 17
Terminate
this device
CBX-D5
SCSI
SCSI
TERMINATOR
17