Error handling, Enable scanning, Initiate polling

Enable scanning	The host must issue a Scan command to enable scanning before
	documents can be transported through the scanner. If scanning has not
	been enabled, the feeder and transport system will not turn on.
Initiate polling	Initiate host system polling of the scanner to ensure scanned document
	images are transferred from the image buffer to the host system.
	Polling should continue until scanning is disabled.
	For more information see the sections entitled, “Controlling image
	transfer order” and “Image header information” later in this chapter.
Feed documents	Feed documents according to the instructions found in the Kodak i1800
	Series Scanners User’s Guide.
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.
	•	An End-of-Job indicator is sent by the operator from the operator
		control panel touchscreen.
	•	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 or the touchscreen, while
	others are reported to both the host and the touchscreen.
	An error is defined as either a current or deferred error.
	A current error results from a problem in processing the current
	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 commands and information will be handled by your
	device driver. The following information is provided for reference
	only.
	When an error occurs, the host will receive a Check Condition Status.
	This indicates to the host that there may be one current error and
	potentially one or more deferred errors. The host must follow a Check
	Condition Status with a Request Sense command. The Sense data will
	indicate the type of error that has occurred.

A-61580 November 2007

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Enable scanning