Table of Contents
Advertisement
external SCSI-2 male 68-pin to SCSI-2 female 50-pin converter (avail-
able from Adaptec). 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.
Remember the termination on all devices in the middle of the daisy
chain has to be OFF and the termination on the last device in the
daisy-chain has to be ON.
Terminating the SCSI Bus
SCSI termination must be enabled on the first and last physical
devices on SCSI Channels A and B of your AHA-3940U/3940UW/
3940UWD host adapter; otherwise, the devices will not operate
properly. You may need to change the termination setting on some
SCSI devices when you install them. In general, the procedure for
terminating the SCSI bus is as follows:
1
The host adapter is at one end of the SCSI channel (SCSI bus).
Determine which SCSI devices is at the other end. Then termi-
nate both of these, if they are not already terminated.
2
Disable termination on all other devices on the SCSI bus, if it is
not already disabled.
Terminating SCSI Devices
Most SCSI disk drives, CD-ROM drives, and other peripheral
devices have a jumper or a switch close to the SCSI connector to
control SCSI termination. Some SCSI devices have resistor modules
that you can remove or insert to change the termination setting.
AHA-3940U/3940UW/3940UWD User's Guide
Stock Number: 511041-00, Rev. B
Print Spec Number: 494569-00
Current Date: 2/14/97
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
Installing the Host Adapter and SCSI Devices
Page: 2-11
ECN Date: 2/17/97
2-11
Advertisement
Table of Contents
