2-4
A-61580 November 2007
To receive subsequent pending errors, the host must execute a Test
Unit Ready command. If a deferred error is pending, the Test Unit
Ready command will terminate with a Check Condition Status. The host
follows with a Request Sense command. The combination of Request
Sense followed by Test Unit Ready must be repeated until a "good"
status is returned on the Test Unit Ready command. A "good" status
indicates no errors (current or deferred) are pending.
IMPORTANT: If at any point the host receives a Check Condition for a
command and fails to issue a subsequent Request
Sense command, the scanner will clear all (current and
deferred) Sense data.
Some error conditions disable scanning and cause the document
transport to stop. These errors are reported on the touchscreen. This is
done to prevent additional images from entering the image buffer while
allowing the host to perform fault recovery activities.
NOTE: The scanner cannot determine exactly which images were
affected by the error and which images were not.
If an error occurs that disables the scanner, the host can continue to
read images from the image buffer without enabling the scanner.
However, when the image buffer has been emptied, an error will be
generated indicating fault recovery is required. This differentiates
between an end-of-job disable and a disable caused by an error. The
operator may continue scanning documents after the host enables the
scanner.
