Asus P55SP4 - Manual (Page 79)

P/I-P55SP4 User’s Manual
Terminator Settings
SCSI devices are connected together in a "chain" by cables. In­
ternal devices connect to the PCI-SC200 with a fifty-pin flat ribbon
cable. External devices connect to the external port with a SCSI-2
cable. If there is more than one internal or external device, additional
devices are connected with cables to form a "daisy chain". The SCSI
chain must be "terminated" at both ends, or the devices in the chain
will not work properly.
Many SCSI devices use a set of terminating resistors to terminate
the device. The PCI-SC200 has "active" termination that you set us­
ing jumper JP5. If you need to terminate the PCI-SC200, you do it by
setting the jumper. The are two settings, terminated and
unterminated, as shown below.
JP5: Terminator setting
Termination
ID
Q-
“D
LD
a.
-3
Enabled
(default)
(3
(J
I
Termination
Disabled
Decide whether or not you need to terminate the PCI-SC200
based on its position in the SCSI chain. Only the devices at each end
of the chain need to be terminated. If you have only internal or only
external devices connected to the PCI-SC200, then you must termi­
nate the PCI-SC200. If you have both internal and external devices
connected, you must not terminate the card. The figures on the next
page illustrate these requirements.
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