Acer PCI to Ultra SCSI RAID Controllers DAC960PG - Manual (Page 16)

SCSI Termination
2-2 DAC960PG and DAC960PJ Installation
SCSI Termination
The DAC960PG and DAC960PJ are equipped with automatic SCSI
termination circuitry. If the controller is at the end of a SCSI bus, it
automatically enables on-board termination.
If all the SCSI devices on a channel are connected either to an internal
connector of a channel, or to an external connector of a channel, the end of
the SCSI bus farthest from the controller must have a terminator installed. In
this case, the controller automatically enables on-board termination. See
Figure 2-1 for examples of internal or external drive configurations.
If some SCSI devices are connected to the internal connector of a channel,
and some are connected to the external connector of the same channel, the
two ends of the SCSI bus farthest from the controller must each be
terminated. In this case, the controller automatically disables on-board
termination. See Figure 2-1 for an example of an internal/external drive
configuration.