Usually, SCSI devices come with the termination built into the device. Older devices actually had two or three terminating resistor packs plugged into the card or drive circuit board. More modern ones have DIP switches to turn the termination on or off.
Essentially, on a SCSI daisy chain ribbon cable with multiple connectors, only the first and last physical device needs to be terminated. Usually SCSI devices come from the factory already terminated. If you have only one device to connect check and see if there is a DIP switch to change. I would go ahead and connect it. If it works, it's probably already set properly.
That said, I have worked with daisy chains of SCSI devices where a particular device would only work if it were terminated even if it was in the middle of the chain. s
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Only one termination should be powered in a SCSI chain. Generally, it should be the last device. It's been a long time since I've worked with SCSI, but I recall that scanners may be picky about where in a chain of multiple devices they are located; electrical noise on the SCSI data lines causes problems with the scanner electronics. I don't recall whether best results are found from locating it as the first device in line from the computer or the last device.
First, determine if your "motherboard" will support a SCSI
hard drive interface. The type of SCSI drives that are available are
Wide Ultra SCSI (40MB/sec), Wide Ultra 2 SCSI (80MB/sec), Ultra 160 SCSI
(160MB/sec) and Ultra 320 SCSI (320MB/sec). Today's standard for SCSI
drives is the SCA SCSI which has an 80 pin female cable to drive
information from the drive to the system board.
Set the jumpers. The drive should have jumpers on it that were set by
the manufacturer. Setting the jumpers allows the drive to be recognized
by your computer's hardware. If the jumpers have not been set, you will
need to set the jumper of the primary drive to "Master," and if you are
installing a secondary drive, the jumpers would be set to "Slave." The
master drive is the drive that the computer boots to first when it
starts up. The jumpers are pins located on the block or end of the hard
drive.Resetting the BIOS default should make the system recognize the drive. Or Press F6 to install third-party SCSI drivers.
Any "Parity Error" is from a communication error on the SCSI bus, and it's bad! Errors are a way of life, and the SCSI transceiver has failsafes to fight them, and one of these is parity. Consider it extra data that the controller sends when you transfer data to your hard disks. Once there, the drives transceiver does a simple ccheck and verifies that the parity is correct. If not, a Parity Error is generated.
99% of the problems surround the SCSI bus itself in the form of a damaged SCSI cable, loose terminator, or a bent pin on a SCSI connector (latter being most common). This error is more apparent after moving the SCSI devices, resulting in unplugging and then replugging the cables back onto the Targets (HDD, CD/DVD ROM, printer, etc.) or back onto the Host Bus Adapter (HBA - the 29320 in your case). Check ALL pins. You can try to straighten the pins, otherwise it's time to replace the cable. REMEMBER that terminators are a must and can also cause Parity Errors if there is no termination present on one end of the bus or the other. This coming from an ex-Adaptec employee and support person! :)
Could be a SCSI termination issue. Try changing the SCSI address number on the scanner to a different one and make sure the chain is terminated properly. If there are multiple SCSI devices in the chain, disconnect all the others until you are sure the scanner is working then slowly add the other devices to the chain making sure everything works as each device is added. SCSI voodoo!
As I recall, this is a SCSI device. Like many electrical connectors, SCSI connectors can develop a light corrosion which can keep the signals from being transmitted. The easiest way to clean such light corrosion is to shut down the Mac & power down *all* SCSI devices in the chain. Then gently unplug & replug all SCSI connectors. This will scrape off much of the corrosion & usually results in connectivity being restored. Be sure to unplug and replug the SCSI terminator attached to the last device in the SCSI chain. Restart by powering up the SCSI devices and finally restarting the Mac. Good luck!
Incorrect Jumper setting (SCSI ID) Each device on the card/controller cable must have unique ID and must be of the proper type for the card/controller...although some like 50-pin SCSI I and II Are interchangeable, larger, newer drives using Ultra, Ultra-Wide and Differential technologies are not.
Typically the controller is set at 7 or 15, so each attached device (CDROM, HDD, Scanner, Plotter, Tape, etc is allowed to use 0-6 or 0-14 depending on controller type.
Doublecheck that you are not trying to use SCSI-Fast, Wide or Ultra controller with the wrong type/technology drive or (gasp) Differential (used mostly for Tape, Robots, Jukeboxes and CD or DVD Arrays) The others won't work... Diff will smoke the drive.
SCSI is a class of knowledge on its own - drive numbering etc etc - Have you set up the drive cable with the termination block at the end ??.
There are plenty of recovery programs around ( if you have a failing drive or deleted filed etc) but first you have to get the drive 'recognised' by the system.
Try also to Google on "SCSI setup" solutions and try www.youtube.com also. There maybe a video on how to set the drive up, there.
I'd suspect the termination or the cables. SCSI is notoriously particular about seeing the proper termination. I've found that I've had to use external termination to get some devices to work. Try one drive at a time to see if you can get any of the hard drives recognized. If not, try better cables or external termination.