ASUS PCI-DA2100 Application Note
14
Chapter 6 Appendices
6.1 Attention of SCSI (ASUS PCI-DA2100)
a) Why is Termination Necessary?
The SCSI bus must be properly terminated at both ends so that
commands and data can be transmitted to and from all devices on the bus.
This is roughly similar to sending vibrations back and forth over the
length of a string that is firmly secured at both ends.
If you hold the middle of the string, the vibrations cannot be transmitted
This is similar to what happens to data and commands on the SCSI bus if
you terminate a device in the middle of the bus.
b) External channel of ASUS PCI-DA2100
The external channel 0 and internal channel 0 are the same channel, the
total devices on external channel 0 and internal channel 0 should not
exceed 15. Disable the termination of internal channel 0 if external
devices are connected.
Int. ch 0
Int. ch 1
Ext. ch 0
Term. Disable
Term. Disable
Up to
15
devices
Terminator on Back Panel Board
Active
Terminator
Ext. SCSI Cable