User Guide

8 ASUS PCI-SC875 User’s Manual
Connecting External 8-bit and 16-bit Devices
When daisy-chaining external 8-bit and 16-bit devices with standard SCSI-2 con-
nectors to the ASUS PCI-SC875, use an external SCSI-2 male 68-pin to SCSI-2
female 50-pin converter. Follow these steps:
1. Daisy-chain all 16-bit devices together with external SCSI-2 Wide cables.
2. Daisy-chain all 8-bit devices together with external SCSI-2 Narrow cables.
3. Connect the first device in the 16-bit device daisy chain to the host adapter with
an appropriate external Wide cable.
4. Plug the converter into the last device in the 16-bit device daisy chain.
5. Use an external narrow cable to connect the first 8-bit device in the 8-bit device
daisy-chain to the other end of the converter.
Terminating the SCSI Bus
The ASUS PCI-SC875 has auto termination so no jumpers are necessary. Terminat-
ing the devices on the ends of the SCSI Bus is necessary for SCSI devices to work
properly. Termination of the devices between the ends must be Disabled. Connect
SCSI devices to two of the three connectors in a linear “chain” for auto termination
of the ASUS PCI-SC875 to be effective. Other formations will cause your SCSI
devices to not mount properly. You must use the end of the ribbon cable when using
the internal connector(s) to keep a linear path. The following shows three possible
chains for this SCSI card:
50Pin
68Pin
15 SCSI Devices Total per Card
7 Max
15 Max
Termination
No Termination
50Pin
68Pin
15 SCSI Devices Total per Card
7 Max
15 Max
Termination
No Termination
Termination
No Termination
50Pin
68Pin
15 SCSI Devices Total per Card
7 Max
15 Max
Termination
No Termination
III. INSTALLATION
III. INSTALLATION
(Termination)