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A-61510 January 2005 2-4
Disable scanning
Scanning is disabled to allow the host to download configuration/
setup changes between jobs and to handle certain types of errors.
Scanning is also disabled when one of the following conditions
occur:
• The scanner is first powered on using the power switch.
• A SCSI bus device Reset command is executed.
• An End-of-Job indicator is sent by the operator from the operator
control panel.
• A scanner-unique End-of-Job command is issued by the host
computer.
• An error occurs requiring fault recovery.
NOTE: When scanning is disabled, documents cannot be scanned
until the host enables scanning.
Error handling
The scanner recognizes and reports a variety of error conditions.
Some errors are reported to either the host (via the SCSI interface) or
the operator control panel, while others are reported to both the host
and the operator control panel.
An error (via the SCSI interface) is defined as either a current or
deferred error.
A current error results from a problem in processing the current
SCSI command. This can include sending an invalid command,
trying to read from an empty image buffer, or an end-of-job
condition. Since one or more errors may be pending at any time,
current errors are reported first.
A deferred error results from an error condition within the scanner,
such as a document jam. Deferred errors that may have occurred
are reported after current errors.
NOTE: Low level SCSI commands and information will be handled
by your device driver. The following information is provided
for reference only.