Scsi Id Guidelines; Scsi Termination Guidelines For External Devices; Connecting The External Scsi Drive - Intergraph InterServe 800 SL System Reference Manual

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SCSI ID Guidelines

By default, specific devices use the following SCSI IDs:
u
System disk drive (standard for boot device) uses ID 0
u
SCSI host bus adapter always uses ID 7
u
Read/write CD-ROM (optional) drive uses ID 4
u
4 mm DAT drive (optional) uses ID 6
NOTE To easily determine the ID of each SCSI device on the system, restart the system. When the
BIOS screen displays, look for the list of SCSI devices and write down the ID for each device.
Some SCSI devices feature push switches to set the ID, while others have DIP switches or
jumpers. See the vendor documentation for details on setting the ID.

SCSI Termination Guidelines for External Devices

Follow the guidelines below for terminating SCSI devices:
u
Disable termination for all devices that are connected to the Ultra-Wide SCSI bus inside
the chassis; the SCSI cable for that bus has an active terminator installed when shipped
from Intergraph Computer Systems.
u
Enable termination on the last external drive on the SCSI cable chain, using only an
active terminator.
u
Disable termination on all other external drives on the SCSI cable chain.

Connecting the External SCSI Drive

To add an external SCSI drive:
1. Connect one end of the external SCSI cable to one of the following external ports:
The optional Ultra SCSI port. It is located on one of the cards installed in the I/O
panel and is available only when ordered as an option at the time the system is
originally purchaed.
The optional Wide Ultra SCSI port. It is located on one of the cards installed in the
I/O panel and is available only when ordered as an option at the time the system is
originally purchased.
2. Connect the other end of the cable to the SCSI device.
3. Set the SCSI ID of the device to an unused number. See "SCSI ID Guidelines" earlier
in this chapter for details.