Important Guidelines For Installing Optional Scsi Devices - Compaq Deskpro AP400 Reference Manual

Important Guidelines for Installing Optional
SCSI Devices
If you are installing additional SCSI devices, you MUST adhere to the
following guidelines:
To preserve data integrity, do not install more than 7 SCSI devices per
SCSI controller.
The integrated Wide-Ultra SCSI controller requires that a unique SCSI
ID (0-7) be set for each SCSI device installed. The controller identifies a
SCSI device by its SCSI ID number rather than its location. Moving a
SCSI device from one position to another on the SCSI chain does not
affect the communication between the controller and the SCSI device.
The reserved and available SCSI ID numbers for SCSI devices are as
follows:
SCSI ID 0 is reserved for the primary hard drive.
SCSI ID 7 is reserved for the controller.
SCSI IDs 1 through 6 are available.
Every SCSI chain or circuit must be terminated (closed) at both ends. If
using a terminated cable, disable the termination for all devices. If using
a non-terminated cable, only disable the termination for the last device
on the chain.
Turn on an external SCSI device before turning on power to the
workstation. This enables the system board controller to recognize the
external SCSI device. When an external SCSI device is connected to the
external SCSI connector on the rear panel of the workstation, that device
becomes the end of the SCSI chain and must be terminated.
Writer: John Turner Project: Compaq Professional Workstation AP400 Reference Guide Comments: 317787-003
CAUTION: Do not route cables near the air intake to the power
supply. Cables routed in this manner may block airflow to the
power supply causing it to overheat.
File Name: J-CH09.DOC Last Saved On: 12/14/98 1:33 PM
COMPAQ CONFIDENTIAL - NEED TO KNOW REQUIRED
Compaq Professional Workstation AP400 Reference Guide
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